Page 1 A g i l e n t 7 8 2 0 A G a s C h r o m a t o g r a p h Service Manual...
Page 2: Notices
No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. Manual Part Number...
Page 3: Table Of Contents
A caution calls attention to a condition or possible situation that could damage or destroy the product or the user's work. Contents Notices 2 1 Before Servicing the Instrument Safety ........14 Hand tools ........14 Specialized tools ......15 Electronic tools ......
Page 4 About the detector signal boards ..... 40 Accessing detector signal boards ..... 41 Replacing detector signal boards ..... 41 Flame Ionization Detector (FID) ....44 Selecting an FID jet ...... 44 Replacing the FID interconnect assembly or spring ........46 Replacing the heater ......
Page 5 Reassembling the FPD ..... 108 Replacing the FPD ......117 Bake out and run checkout test ... 119 Replacing the heater/sensor assemblies ... 119 Replacing the FPD signal board ... 123 4 EPC modules 125 EPC overview ........ 126 Repairing EPC modules ....... 126 Accessing EPC modules .......
Page 6 GC modules and the communications buss..163 To configure an MSD transfer line ... 165 To configure a valve box ....166 Replacing a GC module ....... 166 Removing a GC module ......167 Changing the GC configuration ....167 Configuration locks ......
Page 7 Motor Harness & AC Control Assembly ..184 Inlet/Detector heater harness ....187 Aux Heater/Valve Box Harness ....188 Communications Harness ...... 188 7820 GC/MS Second Inlet Upgrade Harness..191 Keyboard display cable ...... 192 Display Cable Assembly ...... 192 9 Mainframe 193 Mainframe overview ......
Page 8 Replacing the logic board ....216 Replacing the analog and power board ..220 Replacing Components Inside the Lower Rear Metal Cover ........223 Replacing the AC board ....223 Replacing the oven triac ....224 Replacing the power transformer ..226 10 Valves Valves ........
Page 9 Chromatographic symptoms ....252 Loss of sensitivity or excessive drift ... 253 Loss of peaks in specific areas of the chromatogram ......253 Extraneous peaks ......253 Peak broadening and tailing ....254 Baseline shifts ......254 Baseline upsets ......254 Variation in peak area and retention time 255 Pressure check ......
Page 10 Multiplexed ADC ......279 Pneumatics ........280 Power diagnostics ......281 14 Printed circuit boards AC power board ......285 Analog and power board ...... 287 Logic and communications board ....288 Keyboard interconnect board ....288 FID signal board ......290 TCD signal board ......
Page 11 ..........312 Detectors ........316 Flame Ionization Detector (FID) ..317 FID body ........319 FID Collector Assembly ...... 321 FID Base Assembly ......322 Consumables for the FID ..... 324 Thermal Conductivity Detector (TCD) ..325 Thermal Conductivity Detector (TCD) ..327 Consumables for the TCD .....
Page 12 Electronics carrier ...... 387 Display and Keyboard ..... 389 AC power components ...... 390 AC circuit board components ....393 AC power kits ......394 Main transformer ......395 Power cords ......396 Chassis fans ......397 Agilent 7820 GC Service...
Page 13: Before Servicing The Instrument
Before Servicing the Instrument Safety Hand tools Specialized tools Electronic tools Pneumatic tools Agilent 7820 GC Service...
Page 14: Safety
Safety Before servicing the GC, observe the safety precautions in the 7820A Safety Manual. Hand tools We assume you have a well-equipped toolbox, but some of the special tools listed here will be helpful.  T-20 Torx Driver - 5182-3465 ...
Page 15: Specialized Tools
Specialized tools Agilent 7820 GC Service...
Page 16  FID Flow Tool - 19301-60660  FID Cleaning Kit - 9301-0985, (.010-inch Guitar String)  Injection Port Cleaning Kit – 480-0003  12 Piece File Kit – RSF-1200  (Ferrule Removal tool – not shown – 440-1000)  Fiberglass Tape – 0460-0186 ...
Page 17: Electronic Tools
Electronic tools  Digital Multimeter – (Fluke 110 shown)  Power Outlet Test Tool (Radio Shack/Sears/Electrical Supply)  Static Strap – 9300-0970  Various jumpers and clip leads – electronic supply  Useful Cables – not shown:  Crossover LAN Cable – 5183-4649 ...
Page 18: Pneumatic Tools
Pneumatic tools  Electronic Leak Detector  5182-9646 – 120 VAC  5182-9648 – 220 VAC (Agilent)  Rotameter – Porter Model 65 – Tube 1 – 10-70cc/min He, Tube 2 – 85–850cc/min Air http://www.porterinstrument.com/indust_21.php Agilent 7820 GC Service...
Page 19: For Checking Inlet Pressure
 Electronic Flow Meter  ADM 1000 – 220-1170  ADM 2000 – 220-1171-U (Mass Flow Version)  Electronic "Mass" Flow Meter – Flow Tracker  Model 1000 Flow Only – 5183-4779 Model 2000 with Leak Detector – 5183-4780  ...
Page 20 G1530-20610 - FID/NPD Jet Plug “No-Hole” Column Ferrules – 5181-7458 FID Flow adapter - 19301-60660 Agilent 7820 GC Service...
Page 21 5060-9055 uECD/TCD Detector Plug Plastic 1/8-inch Swagelok Cap – P/N 0100-2414 Qty 3 Replacement Septum Purge Fitting for EPC Module – P/N G2630-61720 (Not included in kit) “No Hole” Column Nut (Use with any ferrule) Agilent 7820 GC Service...
Page 23: Inlets
Inlets Inlet overview Split/Splitless Inlet Purged Packed Inlet Agilent 7820 GC Service...
Page 24: Inlet Overview
Inlet overview Inlets are a means of introducing a sample into the carrier gas stream and then into the analyzing column. The term "Inlets" includes:  Injection ports, for use with a syringe  Sampling valves for high sample size reproducibility Split/Splitless Inlet This is the general-purpose inlet for use with capillary columns.
Page 25 Inlets, detectors, and the oven are insulated with fibrous materials which may cause irritation to skin, eyes, and/or mucous membranes. Always wear gloves when working with the insulation. Additionally, if the insulation is flaky/crumbly, wear protective eyewear and a suitable breathing mask and/or respirator.
Page 26: Replacing The Split/Splitless Inlet Top Weldment Assembly
Replacing the inlet assembly is the reverse of these steps. Pay attention to rotational orientations of the inlet body, the preformed insulation and its cup, and positions of the split vent connection and the heater/sensor cable as you fit the assembly into the GC.
Page 27: Replacing The Split/Splitless Inlet Split Vent Line
Guide the top weldment assembly carefully through any interfering wiring and/or tubing to remove it from the GC. Reassembly is the reverse of these steps. Replacing the split/splitless inlet split vent line 1 Turn off all gas flows at their sources. Turn off the GC main power switch.
Page 28: Replacing The Split/Splitless Inlet Split Vent Filter Canister And Valve Assembly
Remove the top EPC module cover and the left side panel on the Remove the inlet cover. Disconnect the split vent line from the inlet and from the trap canister. At the trap end, use two wrenches against each other to prevent the trap body from rotating.
Page 29: Reinstalling The Split/Splitless Inlet
Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 30 inlet insulation sleeve is in place. Install a column nut and blank ferrule on the bottom of the inlet to prevent insulation contamination, and place the inlet into the inlet carrier. Make sure the insulation is properly seated around the inlet and that the heater/sensor wiring harness insulation sleeve is tucked under the top inlet plate.
Page 31: Purged Packed Inlet
Reinstall the insulated thermal cup and insulation in the GC oven. Reinstall the inlet cover. Purged Packed Inlet The purged packed column inlet controls column flow by means of a forward pressure/flow, electronic proportional control valve. A frit (restrictor) provides relatively constant flow out of the septum purge vent.
Page 32 Inlets, detectors, and the oven are insulated with fibrous materials which may cause irritation to skin, eyes, and/or mucous membranes. Always wear gloves when working with the insulation. Additionally, if the insulation is flaky/crumbly, wear protective eyewear and a suitable breathing mask and/or respirator.
Page 33 If the EPC module is disconnected, the inlet can be removed and replaced. Agilent 7820 GC Service...
Page 34 This housing is designed to accommodate a variety of Agilent inlets. Note fibrous insulation within housing. See earlier warning. Agilent 7820 GC Service...
Page 35: Replacing The Purged Packed Inlet Heater
Replacing the Purged Packed inlet heater 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Agilent 7820 GC Service...
Page 36 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 37 With the inlet removed: 1 Remove the tubing nut and column adapter. Remove the bottom nut holding the thermal block. Slide the thermal block off the inlet weldment. Carefully remove the heater and sensor from the thermal (heater) block. Agilent 7820 GC Service...
Page 38 Replace heater/sensor cable assembly with a new unit. Reassembly is the reverse of these steps. Agilent 7820 GC Service...
Page 39: Detectors
Detectors Detector overview About the detector signal boards Accessing detector signal boards Replacing detector signal boards Flame Ionization Detector (FID) Nitrogen Phosphorus Detector (NPD) Thermal Conductivity Detector (TCD) Micro-cell Electron Capture Detector (uECD)84 Flame Photometric Detector (FPD) Agilent 7820 GC Service...
Page 40: Detector Overview
Detector overview A detector monitors the gas stream exiting from the analyzing column. Its electrical output changes when the composition of the gas does. This section deals with the most widely used detectors. About the detector signal boards The GC can control up to 2 detector signal boards and simultaneously process their digital signals.
Page 41: Accessing Detector Signal Boards
G3435-60010 F-DET or B-DET. Also uses AUX Table Detector signal electrical connectors Descripti Other uECD Communicati Electromet on buss Communicati Ignitor Electromete on buss Communicati Bead Electromete on buss current Communicati Switchi J4 Filaments on buss valve Communicati High Signal P5 - on buss voltage...
Page 42 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 43 Turn the thumb screw counter-clockwise and lift the screw to disengage it from the sheet metal. Slide the board down and lift it out. When replacing the signal board, short boards, such as the FID and uECD, slide into 3 slots. Long boards, such as NPD and FPD, slide into 4 slots.
Page 44: Flame Ionization Detector (Fid)
Flame Ionization Detector (FID) The FID is the most widely used of the GC detectors. It responds to almost all organic compounds (there are a few exceptions), has good sensitivity and a wide linear range, and is easy to use. Selecting an FID jet Open the oven door and locate the column connection fitting at the base of the detector.
Page 45 For adaptable fittings, select a jet from the table below, "Jets for capillary adaptable fittings". Table Jets for capillary adaptable fittings Figure 2 Jet type Part number Jet tip id Length Capillary 19244-80560 0.29 mm 61.5 (0.011 inch) Capillary, high- 19244-80620 0.47 mm 61.5 temperature...
Page 46: Replacing The Fid Interconnect Assembly Or Spring
Replacing the FID interconnect assembly or spring 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 47 Remove the three screws holding the collector assembly to the mounting pallet. The next step exposes the interconnect spring. Be careful not to touch or disfigure the spring while working on the FID. Any dirt or bending will reduce the sensitivity of your detector. Lift and remove the assembly from the pallet.
Page 48: Replacing The Heater
To replace the interconnect spring only 1 Pull the spring off the end of the interconnect. Push a new spring on. Reassemble the detector. To replace the interconnect (and spring) 1 Remove the screws at each end of the electrometer body. DO NOT loosen the screw in the center of the electrometer cover.
Page 49 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 50 Disconnect the ignitor cable from the FID signal board to the ignitor castle. Disconnect the electrometer cable from the FID signal board. (For the old version detector) Unscrew the three thumbscrews that secure the detector flow tubing to the EPC module. Agilent 7820 GC Service...
Page 51 (For the new version detector) Unscrew the captive screws that secure the detector flow tubing blocks to the EPC module. Agilent 7820 GC Service...
Page 52 Remove the four T-20 screws retaining the FID assembly to the Lift the entire FID assembly up and off of the GC. Lay the assembly down on a clean flat surface. Examine the underside of the detector assembly. Remove the insulated cover over the heater block. Loosen the heater/sensor cable sufficiently to allow for the lifting and removal of the heater from the heater block.
Page 53: Replacing The Fid Signal Board
Replacing the FID signal board 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 54: Replacing The Electrometer
requested information. Replacing the electrometer 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 55: Replacing The Glow Plug (Ignitor)
Lift the electrometer up and away. Replace the defective electrometer with a new one, making sure that there is firm contact between the interconnect spring and the collector. Reassembly is the reverse of these steps. After reassembly, turn the GC power on and reconfigure the modified detector using the software keypad, supplying the requested information.
Page 56 Inlets, detectors, and the oven are insulated with fibrous materials which may cause irritation to skin, eyes, and/or mucous membranes. Always wear gloves when working with the insulation. Additionally, if the insulation is flaky/crumbly, wear protective eyewear and a suitable breathing mask and/or respirator.
Page 57: Replacing The Entire Fid
The new version detector requires GC FW revision A.01.12.003 or higher. The lower FW revision would potentially result in wrong EPC frit constants uploaded. Refer to service note 7820A -35. 1 Update the GC firmware revision to A.01.12.003 or higher To obtain the latest firmware revision, visit the Agilent website http://www.chem.agilent.com/_layouts/agilent/downloadF...
Page 58 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 59 Disconnect the electrometer cable from the FID signal board. Agilent 7820 GC Service...
Page 60 (For the old version detector) Unscrew the three thumbscrews that secure the detector flow tubing to the EPC module. (For the new version detector) Unscrew the captive screws that secure the detector flow tubing blocks to the EPC module. Agilent 7820 GC Service...
Page 61 Remove the four T-20 screws retaining the FID assembly to the mounting pallet. Lift the entire FID assembly up and off. At this point the entire unit can be replaced with a new or repaired unit. Reassembly is the reverse of these steps. After completing the reassembly turn the power on and reconfigure the GC from the software keypad.
Page 62: Ultrasonic Cleaning The Fid
Locate the disk (CD) that came with the new detector. You will need it to upload the new detector's frit data into the GC. Start Instrument Utility (version B.01.06 or greater), go to Firmware Update > Frit Constants, and connect to the GC. Use the software to upload the new frit constants.
Page 63 It is often more convenient to replace dirty jets with new ones than to clean them, especially jets that have been badly contaminated. 1 Gather the following:  Small ultrasonic cleaning bath  Aqueous detergent  GC-grade methanol in a Teflon wash bottle. Wash bottles made of other materials usually contain plasticizer contaminants ...
Page 64 Push the wire brush through the collector. Rinse the parts in tap water or distilled water. Rinse all surfaces of the parts in methanol; inside and outside surfaces. To insure good rinsing use either a Teflon wash bottle or a beaker. From this point on, handle the parts only with forceps (or tweezers).
Page 65: Nitrogen Phosphorus Detector (Npd)
Nitrogen Phosphorus Detector (NPD) The NPD is a variation on the FID, in that the sample is burned and the resulting ions are collected. However, the hydrogen/air ratio is set to suppress carbon ionization and an alkali salt enhances nitrogen and phosphorus ionization. Selecting an NPD jet Open the oven door and locate the column connection fitting at the base of the detector.
Page 66: Removing The Npd Electrometer
Capillary, high- 19244-80620 0.47 mm 61.5 temperature (0.018 inch) Packed 18710-20119 0.46 mm 63.6 (0.018 inch) Figure Adaptable NPD jets Removing the NPD electrometer 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord.
Page 67: Replacing The Entire Npd
GC on and update firmware to A.01.12.003 or higher. The new version detector requires GC FW revision A.01.12.003 or higher. The lower FW revision would potentially result in wrong EPC frit constants uploaded. Refer to service note 7820A -35. Agilent 7820 GC Service...
Page 68 1 Update the GC firmware revision to A.01.12.003 or higher To obtain the latest firmware revision, visit the Agilent website http://www.chem.agilent.com/_layouts/agilent/downloadFirm ware.aspx?whid=58488 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected.
Page 69 (For the old version detector) Unscrew the three thumbscrews that secure the detector flow tubing to the EPC module. (For the new version detector) Unscrew the captive screws that secure the detector flow tubing blocks to the EPC module. Remove the four T-20 screws retaining the NPD pallet. Agilent 7820 GC Service...
Page 70: Replacing An Npd Signal Board
Lift the entire NPD unit up and off. At this point the entire unit can be replaced. Reassembly is the reverse of these steps. Restore power and reconfigure the GC using the keypad, supplying the requested information. The frit constants update is NOT required for New Version Detectors.
Page 71 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 72: Replacing The Npd Heater
Reconfigure the modified GC from the software keypad, supplying requested information. Replacing the NPD heater 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 73 Inlets, detectors, and the oven are insulated with fibrous materials which may cause irritation to skin, eyes, and/or mucous membranes. Always wear gloves when working with the insulation. Additionally, if the insulation is flaky/crumbly, wear protective eyewear and a suitable breathing mask and/or respirator.
Page 74: Replacing The Npd Electrometer
Remove the four T-20 screws retaining the NPD assembly to the Remove the NPD detector assembly from the GC. Examine the underside of the detector assembly. Cover or plug the sample inlet tube while servicing this unit to limit contamination. Remove the insulated cover over the heater/detector block.
Page 75 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 76: Cleaning The Npd Jet And Collector
Reassembly is the reverse of these steps. Reconfigure the modified GC from the software keypad, supplying requested information. Cleaning the NPD jet and collector The collector requires occasional cleaning to remove deposits (usually white silica from column bleed, or black, carbonaceous soot).
Page 77 This procedure summarizes the general steps for cleaning the parts. You need to follow the standard safety practices of your laboratory for handling chemicals. For example, wear the appropriate safety eye glasses, lab coat, and gloves. Scratches on the NPD jet affect its performance. If you choose to clean the jet, be sure not to scratch or bend the jet.
Page 78: Cleaning The Npd
Rinse all surfaces of the parts in methanol; inside and outside surfaces. To insure good rinsing use either a Teflon wash bottle or a beaker. From this point on, handle the parts only with forceps (or tweezers). Remove the jet from the bath and rinse it thoroughly with hot tap water and then with a small amount of methanol.
Page 79 (For the new version detector) Unscrew the captive screws that secure the detector flow tubing blocks to the EPC module. Remove the four T-20 screws retaining the NPD assembly to the Lift entire unit up and off. Agilent 7820 GC Service...
Page 80 Place unit on a clean surface. Lift up the hinged metal cover over the detector assembly. Remove the three T-10 screws retaining the bead assembly to the housing and then remove the bead assembly to prevent accidental damage. Do not touch the ceramic bead. Apply protective cap over the bead assembly, if available.
Page 81: Thermal Conductivity Detector (Tcd)
Thermal Conductivity Detector (TCD) The TCD is sometimes called the "universal" detector because it responds to anything that is not the carrier gas. Replacing the TCD detector cell 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord.
Page 82 the cell from the bracket. Slide the heater/sensor assembly from the detector cell. Slide the PRT out of the detector cell. Install the new cell and reassemble the detector. Reassembly is the reverse of these steps with the following additional considerations: ...
Page 83: Replacing The Tcd Switching Valve
Replacing the TCD switching valve 1 Turn off all gas flows at their sources. Turn off the GC main power switch. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure. Remove the detector top cover, the electronics cover.
Page 84 Trace the wires from the valve to the extension cable connector. Disconnect them. Loosen the screw holding the clamp and slide the old valve out. Examine the new valve. The plastic part has a flat side with 3 small O-rings. These must be placed over the 3 holes in the piece to which the screw connects.
Page 85: Micro-Cell Electron Capture Detector (Uecd)
Micro-cell Electron Capture Detector (uECD) This detector simply ignores most compounds, but responds with enormous sensitivity to electron-accepting species such as the halogens. Replacing the uECD heater/sensor assembly After removing the uECD detector from the GC, you can further disassemble it to replace the heater/sensor assembly. The ECD micro-cell contains radioactive To reduce the risk of exposure, wear disposable gloves while handling the ECD micro-cell.
Page 86: Replacing The Uecd Makeup Gas Adapter
Slide the heater and sensor out of the lower heated block. Replacing the uECD makeup gas adapter After removing the uECD detector from the GC, you can further disassemble it to replace the makeup gas adapter. The makeup gas adapter consists of a line from the detector pneumatics manifold that carries makeup gas to a weldment that screws into the bottom of the uECD detector.
Page 87: Frequency Test
 The end of the column does not protrude from the top of the makeup gas adapter. For most columns (outer diameter > 0.20 mm), insert the column as far as it will go into the gigabore liner. If using a microbore column (id < 0.20 mm) that passes completely through the liner, position the column so that the total length from the back of the capillary nut to the end of the column is about 69 to...
Page 88 It may take 24 hours for the uECD baseline to completely stabilize, especially if you are starting with a cold system and want to assure high-sensitivity operation. Therefore, for the most accurate results, run the detector at normal operating conditions for as long as possible (at least 2 hours and up to 24 hours) before running the frequency test.
Page 89: Leak Test
Leak test Once you have determined that the flow system components upstream from the detector (gas supply tubing, inlet, column fittings) are leak free, perform the following uECD detector leak test. 1 With the GC on and operating normally, set the oven, detector, and inlet temperatures to ambient.
Page 90 for possible inspection by the Nuclear Regulatory Commission and/or responsible state agency. More frequent tests may be conducted when necessary. The procedure used is the wipe test. A Wipe Test Kit (part no. 18713-60050) is supplied with each new uECD. Refer to the information card supplied in the Wipe Test Kit for instructions on performing the wipe test.
Page 91: Flame Photometric Detector (Fpd)
Flame Photometric Detector (FPD) The sample is burned in a hydrogen-rich flame. Excited species rise into a cooler zone above the flame, decay, and give off characteristic radiation. This is filtered and measured by a high-gain photomultiplier. The intense yellow carbon radiation is blocked by a shield around the flame.
Page 92 Remove and set aside the filter in a lint free cloth. For sulfur, remove the plastic spacer and then the filter. Try tapping the side of the detector or using the edge of a cotton swab. The phosphorus filter sits closer to the end of the housing. Agilent 7820 GC Service...
Page 93 Remove the vent or exhaust tube with a 9/16-inch wrench. Agilent 7820 GC Service...
Page 94 Remove the 4 screws and detector cover with a Torx T-20 driver. Agilent 7820 GC Service...
Page 95 Agilent 7820 GC Service...
Page 96 Loosen one screw and remove the ignitor collar with a Torx T-10 driver. The collar of your ignitor may have 1 or 2 screws. Remove the heater/sensor assembly from the emission block. Agilent 7820 GC Service...
Page 97 Remove one screw and retainer for the heater/sensor assembly in the transfer line with a Torx T-10 Key. Agilent 7820 GC Service...
Page 98 Remove the heater/sensor assembly. Move the heater/sensor assemblies and ignitor cable to the front of the oven top. Remove two 7-mm mounting nuts from the base of the transfer line. Loosen 3 screws that hold the optics assembly to the detector bracket with a Torx T-10 driver.
Page 99 The objective of this step is to separate the optics from the transfer line. Do not flex the tubing where it is brazed to the transfer line weldment. Grasp the transfer line with your left hand and the optics assembly with your right hand. Lift them just high enough so that the 3 screws that you loosened in step 11 are above the bracket.
Page 100 Twist and lift the optics while holding the transfer line stationary. Carefully separate the assemblies. The O-ring on the transfer jet is compressed against the inside of the emissions chamber. This is the resistance that you feel. Place the optic assembly on a lint free cloth. Agilent 7820 GC Service...
Page 101: Rebuilding The Fpd Optics Assembly
If you are not replacing the transfer line, skip to the section Rebuilding the optics assembly ( 101). If you are replacing the transfer line, continue with the next section. Rebuilding the FPD optics assembly Use lint-free gloves when handling the optics assembly and O-ring seal.
Page 102 Set the Y-shaped clamp to one side. Carefully separate the lens housing from the stainless steel coupling. The focusing lens and O-ring usually stick to the coupling, but could stay with the lens housing. Try to keep the housing, flange ring, screws and washers in place. Remove the brown O-ring on the lens housing with a small pick.
Page 103 groove. Remove the coupling and heat shield disk from the old emission chamber with a No 1 Pozidrive or Philips screwdriver. Try to keep the screws, washers, and parts together. Agilent 7820 GC Service...
Page 104 Assemble the ignitor parts. Slip the stainless steel spacer over the glow plug, followed by the O-ring. Do not use the copper washer. Screw the glow plug into the new emission chamber and tighten with a 5/16-inch wrench. Assemble the new emission chamber, seal, and window. Agilent 7820 GC Service...
Page 105 Position the heat shield and coupling onto the emission chamber so the threaded hole is aligned with the threaded fitting for the exhaust tube. Reconnect the parts using the 4 screws and washers. Tighten opposite screws, similar to a wheel on an automobile, to insure a good seal.
Page 106 Turn the lens housing so that it faces the coupling. Insert the lens and rust colored O-ring. Agilent 7820 GC Service...
Page 107 Place the housing onto the coupling and fasten the top screw just tight enough to keep the parts together. Hold the y-shaped clamp and start the remaining screws into the clamp. Do not tighten until step 7 of Reassembling the detector ( 108).
Page 108: Reassembling The Fpd
Reassembling the FPD This part of the procedure reassembles the optics assembly with the transfer line, reconnects both to the detector bracket, replaces the heater/sensor and ignitor wires, replaces the covers and PMT. 1 Replace or install the O-ring on the transfer line jet. Remove the O-ring with a small pick.
Page 109 Reposition the detector optics above the bracket. The objective of this step is to reattach the optics to the transfer line and insure a good seal between the O-ring and the emissions chamber. Grasp the transfer line with your left hand and the optics assembly with your right hand.
Page 110 Agilent 7820 GC Service...
Page 111 Lower the assemblies into the bracket. Line up the holes in the transfer line base with the threaded posts in the bracket. Line up the 3 screws and the clamp with the notches in the detector bracket. Agilent 7820 GC Service...
Page 112 Reattach the transfer line to the bracket with the 7-mm nuts. Tighten the clamp against the detector bracket. Tighten the 3 bottom screws on the optics assembly. Insert the heater/sensor assembly into the transfer line. Make sure the sensor is at the bottom of the hole. Reinstall the retainer and screw.
Page 113 Agilent 7820 GC Service...
Page 114 Insert the heater/sensor assembly into the emission chamber. Reconnect the ignitor wire to the glow plug. Agilent 7820 GC Service...
Page 115 Replace the cover. First, start the 2 screws on the right-hand side of the cover. Second, start and tighten the screws at the base on the left-hand side. Third, tighten the screws on the right-hand side. Agilent 7820 GC Service...
Page 116 Agilent 7820 GC Service...
Page 117: Replacing The Fpd
Replace the filter. If you are doing the Agilent checkout, run the phosphorus filter before the sulfur filter with spacer. Replace the photomultiplier tube (PMT). Connect the spring. Install the new vent tube. Make sure it is tight to prevent light leaks.
Page 118 From the side panel side, disconnect heater sensors to the Aux heater and to the back detector, the ignitor cable, the high voltage connector, and the PMT signal cable. Remove the top four T-20 screws retaining the PMT assembly. Lift up the entire assembly and lay it down on the top GC surface.
Page 119: Bake Out And Run Checkout Test
Loosen the one screw holding the adjacent cover and pivot the cover up and off. The FPD is now ready for replacement, if required. If not, reassembly is the reverse of these steps. Bake out and run checkout test This part of the procedure bakes out the detector and restores conditions.
Page 120  One or both of the heaters or sensors are defective.  The actual temperature reading on the display of the heaters is cycling more than 1 °C. Materials needed  G1535-60610 Heater/Sensor assembly with short lead for the emissions block assembly. ...
Page 121 Position the retainer clip over the heater/sensor assembly and install the screw. Agilent 7820 GC Service...
Page 122 Emissions block assembly 1 Remove the upper heater and temperature sensor from the emissions block assembly. Remove the protective cap from the sensor of the heater/sensor assembly with the long cable. Install the upper heater and sensor in the emissions block assembly.
Page 123: Replacing The Fpd Signal Board
Wait 20 minutes for the detector to heat up, then ignite the flame. Long cable connectors and leads Detector type Location Connecto Single-waveleng Front Single-waveleng Back Replacing the FPD signal board If changing the GC configuration, see Changing the GC configuration ( 167) for important information regarding GC methods.
Page 124 Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels. Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure.
Page 125: Epc Modules
EPC modules EPC overview Repairing EPC modules Accessing EPC modules Replacing the EPC modules Replacing EPC module proportional valves Agilent 7820 GC Service...
Page 126: Epc Overview
Inlet modules are each designed for specific inlets. A PCM has one control channels, intended for carrier gas. Repairing EPC modules The 7820A can control up to 4 EPC modules. Each has a particular purpose and is limited to a particular location in the EPC carrier.
Page 127: Accessing Epc Modules
the display with measured flow for column and split vent.  Detectors: With the detector capped, compare calculated flow readings from the display with measured flow for each gas. Failure modes for a proportional valve include:  Sticking solenoid plunger causing variable flows. ...
Page 128: Replacing The Epc Modules
Replacing the EPC modules 1 Access the EPC module. See Accessing EPC modules ( 127). Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 129: Replacing Epc Module Proportional Valves
Replacing EPC module proportional valves This is a generalized procedure for replacing all EPC proportional valves. Select the valve and valve part number from EPC modules ( 357). Valves come in a kit with spare O-rings and screws. 1 To protect the column and inlet liner, cool all heated zones in the GC.
Page 130 Remove the valve and the O-rings. Clean the seat of the O-ring on the flow block with a lint free cloth. Insert 2 new O-rings. Except for the split vent valve, tie a loose knot in the proportional valve wire to shorten the wire. Attach the new proportional valve, the electrical connector, the EPC retaining clamps, and body panels.
Page 131: Performance Verification
Performance Verification About Chromatographic Checkout To Prepare for Chromatographic Checkout To Check FID Performance To Check NPD Performance To check TCD Performance To Check uECD Performance To Check FPD Performance (Sample 5188-5953)149 About Chromatographic Checkout The tests described in this section provide basic confirmation that the GC and detector can perform comparably to factory condition.
Page 132: To Prepare For Chromatographic Checkout
To Prepare for Chromatographic Checkout Because of the differences in chromatographic performance associated with different consumables, Agilent strongly recommends using the parts listed here for all checkout tests. Agilent also recommends installing new consumable parts whenever the quality of the installed ones is not known. For example, installing a new liner and septum ensures that they will not contribute any contamination to the results.
Page 133 Verify the following:  Capillary column jet installed. If not, select and install a capillary column jet.  Capillary column adapter installed (adaptable FID only). If not, install it.  Chromatographic-grade gases plumbed and configured: helium as carrier gas, nitrogen, hydrogen, and air. (Nitrogen is an acceptable alternate carrier gas.) ...
Page 134 Purge time 0.5 min Gas saver Purged packed inlet Temperature 250 °C Detector Temperature 300 °C H2 flow 30 mL/min Air flow 400 mL/min Makeup flow (N2) 25 mL/min Lit offset Typically 2 pA Oven Initial temp 75 °C Initial time 0.5 min Rate 1 20 °C/min...
Page 135 Injection volume 1 µL Data system Path Setting Method and Run Keep instrument keyboard locked Control View: after method is loaded? = No Instrument>Edit Parameters>Option Method and Run Assign Signal 1 to the detector Control View: Choose Save Data All Instrument>Edit Data Rate = 5 Hz Parameters>Signal...
Page 136: Typical Values
Typical values The following are typical values for the detector results. The results for a detector depend on site preparation related factors. These are not pass/fail criteria. Components Typical area counts C13 and C14 41 pA-sec C15 and C16 410 pA-sec If the detector is very quiet, area counts may be lower than these typical measurements.
Page 137 (19091J-413)  NPD performance evaluation (checkout) sample (18789-60060)  4-mL solvent and waste bottles or equivalent for autoinjector  Chromatographic-grade isooctane  2-mL sample vials or equivalent for sample Verify the following:  Capillary column jet installed. If not, select and install a capillary column jet.
Page 138 Purge time 0.75 min Packed column inlet Temperature 200 °C Detector Temperature 300 °C H2 flow 3 mL/min Air flow 60 mL/min Makeup flow (N2) Makeup + column = 10 mL/min Output 30 display units (30 pA) Oven Initial temp 60 °C Initial time 0 min...
Page 139 Data system Path Setting Method and Run Keep instrument keyboard locked Control View: after method is loaded? = No Instrument>Edit Parameters>Option Method and Run Assign Signal 1 to the detector Control View: Choose Save Data All Instrument>Edit Data Rate = 5 Hz Parameters>Signal If using a data system, prepare the system to perform one run using the loaded checkout method.
Page 140: Typical Values
Typical values The following are typical values for the detector results. The results for a detector depend on site preparation related factors. These are not pass/fail criteria. Agilent ChemStation SS/PP Sensitivity Azobenzene area counts Malathion area counts 64 Agilent ChemStation — A STM noise Measured with GC isothermal @ 100°C 10 minute blank run, noise range(s) >1 minute Performance +...
Page 141  2-mL sample vials or equivalent for sample  Chromatographic-grade helium as carrier, makeup, and reference gas Verify the following:  Chromatographic-grade gases plumbed and configured: helium as carrier gas, nitrogen, hydrogen, and air.  Empty waste vials loaded in sample turret. ...
Page 142 Initial time 0 min Rate 1 25 °C/min Final temp 90 °C Final time 0 min Rate 2 15 °C/min Final temp 170 °C Final time 2 min ALS settings (if installed) Sample washes Sample pumps Sample wash volume 8 Injection volume 1 µL Syringe size...
Page 143 Method and Run Assign Signal 1 to the detector Control View: Choose Save Data All Instrument>Edit Data Rate = 5 Hz Parameters>Signal Display the signal output. A stable output at any value between 12.5 and 750 µV (inclusive) is acceptable. ...
Page 144 The following are typical values for the detector results. The results for a detector depend on site preparation related factors. These are not pass/fail criteria. Agilent ChemStation Sensitivity C , C , C area counts 65 Discrimination C /C area ratio 1.00 +/- 0.10 1.00 +/-...
Page 145: To Check Uecd Performance
output, Range 0) >>Set DATE and TIME<< Zero Pk wd 0.04 Att^2 Thresh Cht sp Stop time 8.75 Ar Rej 1000 Sensitivity C , C , C area counts 525000 460000 Discrimination C /C area ratio 1.00 +/- 0.10 1.00 +/- 0.10 To Check uECD Performance 1 Gather the following:...
Page 146 180 °C. (See the procedure for the SS or PP in the Maintenance manual.)  Be sure to configure the column. Display the signal output to determine baseline output. A stable baseline output at any value between 0.5 and 1000 Hz (ChemStation display units) (inclusive) is acceptable.
Page 147 Initial temp 80 °C Initial time 0 min Rate 1 15 °C/min Final temp 180 °C Final time 10 min ALS settings (if installed) Sample washes Sample pumps Sample wash volume 8 Injection volume 1 µL Syringe size 10 µL Solvent A pre washes Solvent A post...
Page 148 If using a data system, prepare the system to perform one run using the loaded checkout method. Make sure that the data system will output a chromatogram. Start the run. If performing an injection using an autosampler, start the run using the data system or press [Start] on the GC.
Page 149: Typical Values
Typical values The following are typical values for the detector results. The results for a detector depend on site preparation related factors. These are not pass/fail criteria. Agilent ChemStation Noise ([N3]) Measured by ChemStation, ASTM [N3] 4 Hz Signal Area, Lindane peak 6700 3396B or 3396C or 3397A integrator sample conditions with analog input...
Page 150: To Check Fpd Performance (Sample 5188-5953)
To Check FPD Performance (Sample 5188-5953) If sample FPD checkout sample 5188-5953 is available, use it to test FPD performance. To check FPD performance, first check the phosphorus performance, then the sulfur performance. If you are using OpenLab ChemStation edition or GC ChemStation software with your GC, the testing process can be automated using two macros.
Page 151 syntax is: macro "<macro name>.mac",go. The macro will run after each analysis and send a report to the designated printer. From the command line From the Data Analysis view, type the macro command (same syntax as above) into the command line and press Enter. To modify the noise start time Noise measurements normally start at 3.8 minutes.
Page 152 PP in the Maintenance manual.)  Set the oven, inlet, and detector to 250 °C and bake out for at 15 min. (See the procedure for the SS or PP in the Maintenance manual.) Be sure to configure the column. 1 If it is not already installed, install the phosphorus filter.
Page 153 Rate 2 5 °C/min Final temp 2 190 °C Final time 2 4 min ALS settings (if installed) Sample washes Sample pumps Injection volume 1 µL Syringe size 10 µL PreInj Solvent A Washes PreInj Solvent B Washes PostInj Solvent A Washes PostInj Solvent B Washes...
Page 154 Ignite the FPD flame, if not lit. Display the signal output and monitor. This output typically runs between 40 and 55 but can be as high as 70. Wait for the output to level off. This takes approximately 1 hour. If the baseline output is too high: ...
Page 155 Typical values The following are typical values for the detector results. The results for a detector depend on site preparation related factors. These are not pass/fail criteria. Table 4. FPD P filter Typical range after Limits at 24 hours installation MDL (pg/sec) 0.12 to 0.18 ≤...
Page 156 using the data system or press [Start] on the GC. If performing a manual injection (with or without a data system): a Press [Prep Run] to prepare the inlet for splitless injection. b When the GC becomes ready, inject 1 µL of the checkout sample and press [Start] on the GC.
Page 157: Configuration
Configuration Configuration overview GC modules and the communications buss To configure an MSD transfer line To configure a valve box Replacing a GC module Removing a GC module Changing the GC configuration Configuration locks Installing new devices Configuring time Agilent 7820 GC Service...
Page 158: Configuration Overview
Configuration overview There are 2 kinds of configuration information: hard and soft.  Hard configuration includes what hardware options are installed on the GC: the type of inlets and detectors, where they are located, and what auxiliary heaters are connected. ...
Page 159: Inlet Example
Inlet example The configuration control table for a front SSL Inlet includes 4 items. CONFIGURE FRONT INLET Configured: Split/Split less Ignore Ready = FALSE Makeup gas type [ EPC1 ] = (INLET) (SS) This list interprets each line of the control table. ...
Page 160: Pcm Example
F-DET (OK) 64 watts 300.0 This list interprets each line of the control table.  Configured: The type of module configured as a front detector is an FID.  Ignore Ready: If TRUE, the GC will ignore a Not Ready status.
Page 161: Heater Assignments
 GasType: This line indicates the EPC module. In this case, it is plugged into the 4-wire connector labelled EPC6 and is an AUX EPC module for a PCM.  [Heater]: There are no heaters configured in this example. However, you can associate a PCM with a front or back inlet heater.
Page 162 Number Label Typical uses Front inlet Back inlet Front detector Back detector Valve box  As an Inlet or detector, a small zone is isothermal.  As a Thermal Aux, a small zone can be programmed. This table describes this flexibility available in firmware. Controlling Number Heater type...
Page 163: Gc Modules And The Communications Buss
GC modules and the communications buss This GC provides a flexible architecture. Along with the flexibility, the configuration of the GC can be more complex. The flexible architecture is represented in this schematic. Above each arrow is a label that represents an address on a communications buss. The 4-wire communications buss is the nervous system of the GC.
Page 164 communications between the signal board and the module. Agilent 7820 GC Service...
Page 165: To Configure An Msd Transfer Line
To configure an MSD transfer line If the MSD transfer line is not correctly configured, you will find that:  The MSD transfer line heater will not heat  You cannot set a temperature for the transfer line  The transfer line is not seen by the software To fix the problem, make sure the MSD transfer line is correctly configured.
Page 166: To Configure A Valve Box
To configure a valve box The common approach is to configure the valve box heater to Valve Box. Replacing a GC module When replacing an EPC module or a detector signal board, you will have to update the configuration of the GC. This is because the configuration information includes the unique ID# and manufacturing date for these parts.
Page 167: Removing A Gc Module
Removing a GC module It is easy to unconfigure a module and make it appear to be uninstalled without disconnecting any cables. This is useful if a module fails and the customer still wants to use the other modules. For example, if the back inlet fails, the customer can unconfigure the back inlet and continue to use the front inlet and detectors.
Page 168: Configuration Locks
change in configuration and force you to resolve the differences. If you do not resolve differences in both the configuration and method parameter screens the method will not load. Run method or run sequence will not start the run.  Use the GC Configuration Connection screen to get the new configuration.
Page 169: Installing New Devices
Installing new devices When a new device is added to the GC, it must be described so that the GC knows what it is and how to use it. This procedure, using a PCM module as an example, illustrates the process. 1 Replace all instrument covers in the reverse order in which they were removed.
Page 170: Configuring Time
Zero the pressure sensors. Configure the gas types and control mode. a Press [ Config] , then scroll to the correct PCM entry ( PCM A or PCM B ). b Scroll to Gas type and use the [ Mode/Type ] key to set the gas type connected to the PCM's Channel 1 .
Page 171: External Cabling
External Cabling Connectors on the back of the GC Remote Start/Stop Automatic sampler for GC Analog signal outputs Agilent 7820 GC Service...
Page 172: Connectors On The Back Of The Gc
Connectors on the back of the GC Remote Start/Stop These cables are used to link multiple instruments together, so that they start and stop together. APG Remote Control Remote control allows easy connection between single instruments or systems to ensure coordinated analysis with simple coupling requirements.
Page 173 You can synchronize a maximum of ten instruments using Remote cables. Control of analysis is maintained by instrument readiness - READY for next analysis, followed by START of run and optional STOP of run triggered on the respective lines. In addition, PREPARE may be issued to initiate pre-run activities.
Page 174 proper base current is supplied. An open-collector logic gate will perform this same function. A low-side drive IC will also work, but Darlington-type drivers should be avoided as they will not meet the low-side voltage requirement of less than 0.4V. The Remote Connector Signal Descriptions Prepare (Low...
Page 175 Stop (Low True)—Request to reach system ready state as soon as possible (for example, stop run, abort or finish, and stop injection). Receiver is any module performing runtime-controlled activities. Normally this line is not connected, if the GC oven program is used to control the method “Stop” time. Timing Diagram Agilent 7820 GC Service...
Page 176: Cable Pinouts, Remote Start/Stop, General Use
Cable pinouts, remote start/stop, general Connector 1 Connector 2 9 pin Signal name (spade (male) lugs) Black Prepare (low true) White Start (low true) Start relay Green Start relay Brown No connection Blue Ready (high true input) Orange Stop (low true) Yellow No connection Violet...
Page 177: Cable Pinouts, Gc To 3395B/3396C Integrator
Cable pinouts, GC to 3395B/3396C Integrator Connector Connector 2 Signal name 15 pin (male) 9 pin (male) 9 — Ground Prepare No connection Start 3 — Start in Start relay No connection Start relay No connection No connection No connection Ready 14 —...
Page 178: Analog Signal Outputs
Analog signal outputs There is one channel of analog output available on the back panel, labeled Analog Out. Two cables are available — one for 3395/6 series integrators and one for general use. Analog cable: GC to 3395A/B or 3396B/C Integrators and 35900 C/D/E Analog to Digital Interface instrument Connector 1...
Page 179: Analog Cable: General Use
Analog cable: general use Connector 1 Signal name Connector 2 — quick disconnects not used Brown 0 to 1 V, 0 to 10 V(–) White not used 1 V (+) Black 10 V (+) Blue Shell Ground Orange Agilent 7820 GC Service...
Page 181: Internal Cabling
Internal Cabling Internal cabling overview Ignitor cable, FID NPD power cable AC power inlet assemblies Motor Harness & AC Control Assembly Inlet/Detector heater harness Aux Heater/Valve Box Harness Communications Harness 7820 GC/MS Second Inlet Upgrade Harness Keyboard display cable Display Cable Assembly This section covers wiring harnesses in the gas chromatograph.
Page 182: Internal Cabling Overview
Internal cabling overview The various modules that make up the GC are powered and interconnected by a set of cables and wiring harnesses. These modules include inlets, detectors, temperature controllers, printed circuit boards, and power supplies. Ignitor cable, FID Part number G3431-60680 The ignitor cable connects the glow plug ignitor to its power source.
Page 183: Npd Power Cable
NPD power cable Part number G3434-60600 This cable provides power to the heated bead in the NPD. Connection table Connector A Wire color Connector B Braided Shell shield Blue Female Clear Male Agilent 7820 GC Service...
Page 184: Ac Power Inlet Assemblies
AC power inlet assemblies These assemblies provide the connection between the external power cord and the internal AC power board. C20 assembly (for C19 plug) Part number G1530-61550 C14 assembly (for C13 plug) Part number G1530-61560 Motor Harness & AC Control Assembly Part number G3430-60512 This harness provides 24 VDC power from the Analog and Power board at P18 for the following functions:...
Page 185  Flapper motor (6 pin, 2 x 3 connector)  Inlet fan motor (3 pin)  Oven sensor (2 pin, shortest)  Pneumatics fan motor (2 pin)  Shut-off solenoid on the AC board (5 pin, 3 used) Agilent 7820 GC Service...
Page 186 Note: Oven cryovalve connector not used for 7820A GC. Connection table C1 connector Wire color Destination Black Flapper motor 2 White/Blue Flapper motor 4 Flapper motor 6 Orange Inlet fan 2 White/Green Inlet fan 3 Blue Pneumatics fan 2 Green...
Page 187: Inlet/Detector Heater Harness
Inlet/Detector heater harness Part number G4350-60535 This harness connects the inlet and detector heaters to the logic board at P7. The FI and BI connectors are for inlets; FD and BD are for detectors. (FI = Front Inlet, BD = Back Detector, and so forth) Connection table S1 pin Wire color Signal name...
Page 188: Aux Heater/Valve Box Harness
Aux Heater/Valve Box Harness Part number G4350-60660 This cable connects any auxiliary device or valve heaters or solenoids to the analog and power board (at P22). Connection table S1 pin Wire color Destination Signal (pin) Violet A1 (2) Aux1-Sense Green A1 (4) Heater COM Yellow...
Page 189 This harness provides 24 VDC from the Analog and Power board to all EPC modules. It also carries communications between the EPC modules and the signal board. The harness connector labeled "Power" connects to P1 on the Analog and Power board. The harness connector labeled "LVDS"...
Page 190 Power connection table Black wires, that are not part of twisted pairs, are GROUND for pin 2 of the associated EPC. Red wires, that are not part of twisted pairs, supply + 24 VDC to pin 1 of the associated EPC module. Power connector Wire Signal...
Page 191: 7820 Gc/Ms Second Inlet Upgrade Harness
7820 GC/MS Second Inlet Upgrade Harness Part number G4350-60536 Use this cable to connect to an MSD transfer line if the 7820A GC has a back inlet installed. This cable connects to the analog and power board (at P22). (Normally, an MSD transfer line uses the back inlet heater connector.)
Page 192: Keyboard Display Cable
connection Black MS (3) ACOM MS (1) Aux 1 connection connection Keyboard display cable Part number G4350-60514 This harness connects the keyboard and display to the logic board at P8. Display Cable Assembly Part number G4350-60515 This cable provides the connection between the display board and interconnect board.
Page 193: Mainframe
Mainframe Mainframe overview Covers and Fans Replacing the oven door Oven temperature control Oven temperature troubleshooting Measuring inlet and detector heater and PRT resistance Testing resistance of the oven heater coil203 Replacing the oven shroud, oven fan, and oven fan motor Replacing the oven flapper assembly Replacing Components Inside the Electronics Panel...
Page 194: Mainframe Overview
Mainframe overview The GC mainframe consists of the chassis (baseplate) plus the following:  A set of metal and plastic covers  The oven, oven door, and related parts  Electronic components inside the right side cover. These are the "mind" of the GC. ...
Page 195 To replace the cover, make certain that the slot in the brass bushing (lower right corner) is vertical and that the bushing is fully seated. Installation is then the reverse of removal. The pneumatics top cover The pneumatics cover protects the flow manifolds in the back top of the GC.
Page 196: Replacing The Oven Bezel
Replacing the oven bezel Be careful! The oven and/or bezel may be hot enough to cause burns. If it is hot, wear gloves to protect your hands. The bezel consists of a plastic cover over a metal plate. It is held by two screws that are reached through holes in the top of the bezel.
Page 197: Replacing The Epc Cooling Fan
Remove the top rear cover by pressing in on the side retaining clips and lifting off. Disconnect its cable from the GC wiring harness. Remove the fan from its clips. In reassembly, make sure the label side of the fan faces upwards (flow must be in the upwards direction).
Page 198 Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure. Remove the lower rear cover on the GC. The fan is located below the EPC module compartment; begin by disconnecting the fan's cable.
Page 199: Replacing The Oven Door
Replacing the oven door Be careful! The oven and/or inlet may be hot enough to cause burns. If the inlet is hot, wear gloves to protect your hands. 1 If an ALS is installed, remove it. Remove the GC pneumatics cover and the top back panel. Remove the six T-20 screws retaining the inlet cover, lift off and remove the cover.
Page 200: Oven Temperature Control
Oven temperature control The oven temperature is controlled by a combination of the shroud heater, and the flapper assembly. Temperature control and safety require a tight seal between the oven door and the oven body. DO NOT place anything (such as thermocouple leads) between these two parts.
Page 201: Measuring Inlet And Detector Heater And Prt Resistance
1 On the software keypad, press [Status] to check for errors. Decrease oven temperature by at least 20 degrees. Verify that the oven flaps in the back of the GC are open. Listen to verify that the fan is operating. ...
Page 202 heater/sensor connector to be tested.  For inlets, remove the inlet cover and GC left side panel  For detectors, remove the electronics cover and GC right side panel Remove the connector from the GC chassis. Use an Ohmmeter to measure the resistance across the connector pins of the heater/sensor cable.
Page 203 Sensor resistance The approximate resistance of a temperature sensor is: R = 100 + (.35  t) where R is resistance in ohms and t is sensor temperature in °C. Temperature Sensor Resistance by Heater Temperature °C +0° +10° +20° +30°...
Page 204: Testing Resistance Of The Oven Heater Coil203
Testing resistance of the oven heater coil If you believe that your heater coil is cracked or otherwise damaged and has caused an open circuit, you can check it by measuring its resistance. Before proceeding, turn off the main power switch and unplug the power cord.
Page 205: Replacing The Oven Shroud, Oven Fan, And Oven Fan Motor
Replacing the oven shroud, oven fan, and oven fan motor 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 206 At the front of the GC, remove all obstructing items from inside the oven (column(s), column hanger(s), inlet/detector insulation cups, and so forth). At the rear of the GC, disconnect the oven sensor cable at the Analog and Power board and feed the cable back to the rear of the GC.
Page 207 Connectors for the oven heater wires and for the oven sensor must be carefully worked through the access hole at the rear of the oven. There is also a 'plug' of insulation which may fall from the access hole during this process: it must be replaced in reassembly from the rear of the GC.
Page 208: Replacing The Oven Flapper Assembly
 Orient the motor such that its power cable exits towards the electronic side of the GC  Reinstall the top nut first to support weight of the motor  After motor reassembly into the GC, check that its shaft extends perpendicularly from the back oven wall.
Page 209: Replacing Components Inside The Electronics Panel
Replacing Components Inside the Electronics Panel Accessing the analog and power board To access the analog and power board in the rear of the electronics carrier, you must first remove:  The ALS controller board  The valve bracket (not shown below) ...
Page 210 Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure. Remove the right side panel. Remove 1 T-20 screw holding the assembly to the back of the electronics carrier.
Page 211 Pull the ALS module free from the back panel. Connect the flex cable of the new ALS module to the Analog & Power board. Place the ALS module back onto the mounting stud on the back panel so that screw holes are lined up. Connect the 2-wire power cable.
Page 212: Replacing The Fuse On The Als Controller Board
Replacing the fuse on the ALS controller board A small fuse on the ALS controller board protects it from over-currents originating in the ALS components (Injector, for example), or shorts in their cables. The fuse is associated with the 42 VAC circuit. You can easily replace this fuse. 1 Cool down the oven.
Page 213 Using the tweezer, carefully replace the fuse. Reinstall the cover. Insure that the connectors are visible. Reinstall the ALS controller board. Before plugging in any ALS components (for example injectors), power on the GC. Check Service Mode | Diagnostics | ALS status to make sure the model number and firmware revision of the board are displayed.
Page 214: Removing The Valve Bracket
Removing the valve bracket 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 215 Disconnect the wiring harness from the Analog and Power board at P22. Agilent 7820 GC Service...
Page 216: Replacing The Logic Board
Replacing the logic board The logic board contains information specific to the GC and its configuration, including methods, sequences, serial number, date of manufacture, the Gateway, Subnet Mask, and IP address of the LAN, logs, oven type, heater configuration(s), detector frit data, and so forth.
Page 217 Components can be damaged by static electricity: be sure to wear an ESD strap grounded to the GC chassis while performing this procedure. Remove the right side electronics panel cover. Disconnect the ribbon cable to the keyboard/display. Disconnect the communications bus cable. If present, also remove the external LAN cable.
Page 218 Reinstallation is the reversal of removal steps. Restore power to the GC. The zero offsets for the flow and pressure sensors are stored on the logic board rather than in the EPC modules. You must now zero all sensors. Navigate to Service Mode | Diagnostics | Electronics | Pneumatics to do this.
Page 219 Record the serial number located on the side of the detector. (Example TCD and FID labels shown, other detectors are similar.) Locate the disk (CD) that came with the new detector. You will need it to upload the new detector's frit data into the GC. Start Instrument Utility (version B.01.06 or greater), go to Firmware Update >...
Page 220: Replacing The Analog And Power Board
Replacing the analog and power board 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 221 Disconnect cables at all board receptacles. Remove 8 T-20 screws:  One is a long grounding screw found at the lower right corner of the board  One screw is difficult to locate next to and above the transformer receptacle near the right center of the board ...
Page 222 Slide the board slightly outward and to its left to release it from the GC. Installation of the new board is essentially the reverse of removal steps with the following considerations:  Make sure the long grounding screw is returned to its proper location ...
Page 223: Replacing Components Inside The Lower Rear Metal Cover
Replacing Components Inside the Lower Rear Metal Cover Replacing the AC board 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 224: Replacing The Oven Triac
towards the front of the GC until it releases from the switch on the board. Rotate the mounting thumbscrew counterclockwise until an audible "click" sound is heard. Then slide the board slightly towards the center of the GC and lift it off its standoffs. In reassembly, pay attention to the following: ...
Page 225 Carefully note BOTH physical orientation of the triac AND which of its three leads connects to each of its terminals. A mistake here in reassembly may destroy the new triac and/or result in a lack of proper oven control. Remove three wires from the triac. Remove two 5.5-mm hex nuts with captured lockwashers securing the triac.
Page 226: Replacing The Power Transformer
Replacing the power transformer 1 Cool down the oven. Turn off the GC main power switch and disconnect its power cord. Hazardous voltages are present in the mainframe when the GC power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before removing any GC panels.
Page 227 room to pass through the largest of the three cable connectors. Note the orientation of the old transformer with respect to the various cables, then remove the Allen bolt to release the transformer. Carefully lift it from the GC. In replacement, make sure the lower pad is in place, then orient the new transformer onto the pad.
Page 229: Valves
Valves Valves Valve Box Actuators Typical Valve Configurations Troubleshooting Agilent 7820 GC Service...
Page 230: Valves
Valves Valves are used to modify the carrier gas flow during an analysis. Among their uses are:  Highly reproducible injections and many others. Some examples are included in this section. In this GC, most sampling valves are rotated by air-driven actuators.
Page 231: Valco W-Series Minivalves
To reduce the fire hazard when sampling flammable gases or liquids under pressure, operators should routinely make pressure-leak tests of the plumbing, fitting and valves. Both valve positions should be checked. Depending on the nature and pressure of the sample stream, periodic pressure leak test and visual inspection should be made since wear or use could cause leaks to develop.
Page 232 Intermediate positions of the rotor may result in an interrupted flow path which could cause damage to the valve or other components in the chromatograph. Valve rotors Rotor type can be identified by color:  An off-white rotor is made of a PTFE composite and may be used from room temperature to 200°C.
Page 233: Gas Sample Valves
Gas sample valves The standard gas sample valves have 1/16-inch zero dead volume fittings and an internal port diameter of 0.016-inch. 6-port valve (actuator side view) showing flow path grooves Gas sample loops A 0.25 mL sample loop is included with all gas sampling valve systems.
Page 234: Valve Box
Valve Box Installing the valve box The valve box sits on top of the GC and contains the valves and plumbing, heated zones and sensors, and the insulation. 1 Use a pair of diagonal cutters to remove the metal cutout on the top of the GC.
Page 235 Place the valve box insulation in the valve box top. Make sure the perforations in the insulation line up properly with the valve box top. Insert the insulation retainer plate in the bottom of the valve box top and secure it to the threaded studs using the two 5.5-mm nuts.
Page 236 Figure 2. Attaching the standoffs to the bottom plate Figure 3. Attaching the bottom plate to the GC Figure 4. Attaching heater block to the bottom plate Agilent 7820 GC Service...
Page 237 Figure 5. Installing valves Figure 6. Valve in the OFF position (top view) Agilent 7820 GC Service...
Page 238: Removing The Valve Box Assembly
Figure 7. Installing the valve box top assembly Removing the valve box assembly 1 Place the main power switch in the off position. Hazardous voltages are present in the instrument when the power cord is connected. Avoid a potentially dangerous shock hazard by disconnecting the power cord before working on the instrument.
Page 239 When the oven has cooled, turn off all gas supplies. Switch the solenoid valve off so the actuator is in its fully extended position (piston rod extended). If variable restrictors are present, remove their mounting hardware in the following order: two Torx T-20 screws, hex nut, and mounting bracket for each restrictor valve.
Page 240: Actuators
Actuators Valve rotors are driven by air-operated actuators. The air is controlled by solenoid valves inside the right side panel. Installing the actuators The actuators use pneumatic pressure (40 to 70 psi) to switch the valves between their two positions. 1 After installing the valves and valve box as described in the Valve Box ( 234) section, you can install the valve actuators.
Page 241 Install the valve actuator drivers. Mounting the actuator on the valve box Engaging the actuator drive shaft with the valve Agilent 7820 GC Service...
Page 242: Valve Actuator Drivers
Valve actuator drivers Replacing a solenoid valve (new style) To replace a new style solenoid valve: 1 Turn off the valve actuator air supply. The detector, inlet, oven top, and valve box may be hot enough to cause burns. Remove the GC right side cover. Hazardous voltages are present when the GC electronics are exposed.
Page 243 Press and hold the switch on the bottom of one of the solenoid valves until no residual air pressure remains. (7890A GC shown below; 7820A GC is similar.) Turn off the GC and unplug the power cord. If installed, allow the heated valve box to cool.
Page 244 Remove the two screws that hold the end plates and existing valves together. (7890A GC shown below; 7820A GC is similar.) Use a 4-mm hex key to remove the screw that holds the solenoid stack left end plate in place.
Page 245 them as best as possible, then slide a screw through the left end plate and solenoids.  Use 25 mm screws for 1 solenoid  Use 50 mm screws for 2 solenoids  Use 70 mm screws for 3 solenoids Repeat for the second screw.
Page 246: Valve Actuator Alignment
Hazardous voltages are present when the GC electronics are exposed. Reinstall the actuator solenoid bracket to the GC. Connect the GC power cord and turn on the GC. Press the switch under each solenoid to activate it and pressurize the system. The solenoid valve replacement is complete.
Page 247: Typical Valve Configurations
Typical Valve Configurations Option numbers Numbers of the form n0n are for standard temperatures (ambient to 200 °C). Numbers of the form n5n are for high temperatures (100 to 350 °C). Custom Plumbing (diagram required), Option 700 Agilent 7820 GC Service...
Page 248: Gas Sampling Option, Option 701 Or 751
Custom Plumbing (Diagram Required), Option 700 Gas Sampling Option, Option 701 or 751 Gas Sampling Option, Option 701 or 751 Column Isolation, Option 702 or 752 Agilent 7820 GC Service...
Page 249: Two Stream Selection (Requires Gas Sampling), Option 703 Or 753
Column Isolation, Option 702 or 752 High temperature needle valve supplied with option 752 Two Stream Selection (Requires Gas Sampling), Option 703 or 753 Two Stream Selection (Requiers Gas Sampling), Option 703 or 753 Custom Plumbing (Diagram Required), Option 800 Agilent 7820 GC Service...
Page 250: Gas Sampling With Backflush Of Precolumn To Vent, Option 801
Custom Plumbing (Diagram Required)), Option 800 Gas Sampling with Backflush of Precolumn to Vent, Option 801 Gas Sampling with Backflush of Precolumn to Vent, Option Gas Sampling with Backflush to Detector, Option 802 Agilent 7820 GC Service...
Page 251: Gas Sampling With Sequence Reverse And Backflush Of Column 1, Option 805
Gas Sampling with Backflush to Detector, Option 802 Gas Sampling with Sequence Reverse and Backflush of Column 1, Option 805 Gas Sampling with Sequence Reverse and Backflush of Column 1, Option 805 Agilent 7820 GC Service...
Page 252: Troubleshooting
Troubleshooting Most of the problems associated with sampling valves are related to peak broadening in transfer lines and inlets, sample adsorption by the valve or transfer lines, leaks, and perturbations in the baseline. Chromatographic symptoms Troubleshooting valves and their related plumbing is primarily a matter of systematic checking and verification of unimpaired mechanical operation of any moving part.
Page 253: Loss Of Sensitivity Or Excessive Drift
Loss of sensitivity or excessive drift Several possible causes exist for overall deterioration of the chromatogram.  Contamination in the valve requires a thorough cleaning.  Internal leakage requires a complete disassembly and inspection of the mating surfaces.  Poor temperature control may require a full check of electronic and thermal components.
Page 254: Peak Broadening And Tailing
condition the valve. Other causes, totally unrelated to the valve, may produce similar symptoms. Impure carrier gas (i.e., containing water) can cause extraneous peaks. Peak broadening and tailing Voids in the flow system (valve and connecting tubing) cause tailing and peak broadening. Use inlets and liners with small internal diameters and connect the valve to the inlet or column with short lengths of connecting tubing of narrow inner diameter.
Page 255: Variation In Peak Area And Retention Time
Fixed restrictors are used immediately before flame detectors to prevent flameout and are used in some instances to prevent pressure surges from damaging TCD filaments. An adjustable restrictor (needle valve) can also be used where a matched restriction is desired but not for preventing pressure or flow surges.
Page 256 1 Disconnect the detector from the valve system. Cap the valve system at its outlet and pressurize to 689 kPa (100 psi). Allow 2 to 5 minutes for pressure to equilibrate. If your instrument has flow control, it should read zero flow. Turn off the gas supply at the source.
Page 257: Electrical
Electrical Power options Converting the power option Remote start/stop connection Remote control Temperature sensor resistance Ceramic and glass fuses AC power board schematic Oven shroud Agilent 7820 GC Service...
Page 258: Power Options
Power options Use an AC power kit to convert the GC from one power configuration to another, or to replace multiple AC power components. AC power kits 100 VAC 200 VAC 220 VAC 220 VAC - 230 VAC 240 VAC 120 VAC contains: G4350-630...
Page 259: Converting The Power Option
Converting the power option This procedure outlines the steps you must complete to prepare a GC for use in another country or to configure for a different oven heating speed. Procedure 1 Select the appropriate power option kit. See Power options ( 257).
Page 260 Configure the new power configuration using the jumper wire. The placement of the jumper wire, from P8 to another connector, sets the configuration. See the diagrams below. If necessary, replace the power cord receptacle and wires. Attach the new label. Power on the unit.
Page 261: Remote Start/Stop Connection
Remote start/stop connection Prepare (low)—Request to prepare for analysis. Receiver is any module performing pre-analysis activities. Start (low)—Request to start run/timetable. Receiver is any module performing runtime-controlled activities. Ready (high)—System is ready for next analysis. Receiver is any sequence controller. Stop (low)—Request to reach system ready state as soon as possible (for example, stop run, abort or finish, and stop injection).
Page 262: Remote Control
Remote control Remote control allows easy connection between single instruments or systems to ensure coordinated analysis with simple coupling requirements. Start Relay—A 120 millisecond contact closure Control of analysis is maintained by signal readiness READY for next analysis, followed by START of run and optional STOP of run triggered on the respective lines.
Page 263: Temperature Sensor Resistance
Temperature sensor resistance The approximate resistance of a temperature sensor is: R = 100 + (.35  t) Where R is resistance in ohms and t is sensor temperature in °C. Temperature Sensor Resistance by Heater Temperature °C +0° +10° +20°...
Page 264: Ac Power Board Schematic
Ceramic Type F Oven heater 2110-0098 20A/250 V Ceramic Type F Oven heater 2110-0098 20A/250 V 100-120V board: Main supply Glass Type F 8A/250 V 2110-0036 200-240V board: Glass Type F 6A/250 V 2110-0056 100-120V board: Main supply Glass Type F 8A/250 V 2110-0036 200-240V board: Glass Type F 6A/250 V...
Page 265: Oven Shroud
Oven shroud There are two different oven shrouds depending on the power option used. The oven shroud contains the oven heater and sensor as part of the assembly. If you need to replace the heater or sensor, you should replace the entire shroud assembly. See Replacing the oven shroud, oven fan, and oven fan motor ( 205).
Page 267: Firmware
Firmware Firmware overview Confirm firmware update To Update GC Firmware To Update Frit Constants Agilent 7820 GC Service...
Page 268: Firmware Overview
Firmware overview The firmware is the programming that controls the entire GC. Periodic updates to correct errors and/or add features are available from the Agilent Web site and may be downloaded to the GC using the Agilent Instrument Utility software that shipped with the GC.
Page 269: To Update Gc Firmware
 Inlet and detector gas types  Heater configuration.  LAN configuration information  Serial number and manufacturing date - Service Mode | Diagnostics | Instrument Status. If the GC does not have a valid serial number, you may have issues connecting with some software. If the GC does not have a valid manufacturing date, the configuration settings will not be saved and will be lost if you power cycle the GC.
Page 270 itself, for example, any local methods or service information (Early Maintenance Feedback counters, runtime details, and so forth). Select Firmware Update from the explorer pane. Select the desired instrument from the Instrument list and click Connect .  If it is not available, click Add New Instrument to open Configure Instruments .
Page 271: To Update Frit Constants
B.01.06 or greater. When possible always use the latest version of Instrument Utilities. The 7820A GC uses a generic electronic pressure control module (EPC) for its detectors. However, the flow characteristics needed for the GC to properly calculate flows in the detector require information about the detector body.
Page 272 Before updating the frit constants, make sure that the GC is not in use. Close any open data system sessions. To update the frit constants in the GC: 1 Open Instrument Utilities. From Lab at a Glance , go to Firmware Update > Frit Constants .
Page 273 take a few minutes. When you see a message that the download succeeded, reboot the GC to apply the new frit data. Run the detector checkout test to confirm GC performance with the new frit data. Agilent 7820 GC Service...
Page 275: Service Mode Diagnostics
Service Mode Diagnostics Service mode overview Detector diagnostics Signal board diagnostics Multiplexed ADC Pneumatics Power diagnostics Agilent 7820 GC Service...
Page 276: Service Mode Overview
Service mode overview Service mode generates a series of tables that include information that can help with diagnosing problems. For example, the detector signal board diagnostic includes information to verify a short in an FID ignitor. It also contains a measurement of the Noise in the signal output.
Page 277: Signal Board Diagnostics
Scroll to <Front, or Back detector> and press [Enter]. The list of diagnostics that are available vary with your configuration. Here is an example of an FID detector. FRONT FID DIAGNOSTICS Detector Signal Pneumatics module Hydrogen gas Air gas Makeup gas Detector body SN: 8xxxxxx Signal board diagnostics...
Page 278 1234567890 Agilent 7820 GC Service...
Page 279: Multiplexed Adc
Multiplexed ADC This information is based on Service Mode | Diagnostics | Electronics | Multiplexed ADC. MULTIPLEXED ADC Definition Oven rtd Reading noise 159.8 Reading value 1801821 Offset 54907 Gain 4173672 counts/volt Gain counts/ohm 14607 Reference 95.446 Temperature Reading value 1801887 Reading value Reading value...
Page 280: Pneumatics
 Oven rtd reading  Front detector rtd reading  Back detector rtd reading  Front inlet rtd reading  Back inlet rtd reading  Auxiliary 1 rtd reading  Line Sense reading  Temperature ref reading  Atmospheric pressure reading ...
Page 281: Power Diagnostics
Power diagnostics This information is based on Service Mode | Diagnostics | Electronics | Power Info. POWER DIAGNOSTICS Front inl: 72.5W 39.8 ****% Front det: 74.2W 40.8 ****% Aux 1: 0.5W ---- ****% ---- Back inl: 72.5W 39.8 ****% Back det: 74.2W 40.8 ****%...
Page 283: Printed Circuit Boards
Printed circuit boards AC power board Analog and power board Logic and communications board Keyboard interconnect board FID signal board TCD signal board uECD signal board NPD signal board FID electrometer board uECD electrometer board NPD electrometer board FPD signal board Agilent 7820 GC Service...
Page 284 This section describes the following circuit boards and their connections. Some connectors are marked MTC, which stands for Manufacturing Test Connector. There may or may not be a connector loaded on the board. MTCs are used at the factory to connect to test equipment so that the board can be exercised without the need for a GC.
Page 285: Ac Power Board
AC power board 100/120 V Part number G4350-61060 Connector Function Supplies power to transformer primary windings. Oven fan motor Oven control from logic board P1 and P2 Supply line power to the AC board. P3 and P4 Supply power to the oven heater. P5, P6, and These three connectors take jumpers to the oven triac.
Page 286 200/220/230/240V Part number G4350-61050 Connector Function Supplies power to transformer primary windings. Oven fan motor Oven control from logic board P1 and P2 Supply line power to the AC board. P3 and P4 Supply power to the oven heater. P5, P6, and These three connectors take jumpers to the oven triac.
Page 287: Analog And Power Board
Analog and power board Part number G4350-61150. Connecto Function See also SIG 1. Analog output for signal 1. Analog signal outputs ( 178) REMOTE. Synchronize start/stop functions Remote Start/Stop ( 172) for up to 10 devices. 96-pin data connection to analog and power board.
Page 288: Logic And Communications Board
Logic and communications board Part number G4350-60101. Connecto Function See also External LAN port. 96-pin buss to analog and power board. Connects to Comm Buss on Communication harness Communications Harness. 44-pin ribbon cable to Keyboard/Display keyboard and display. harness, Keyboard interconnect board Keyboard interconnect board This board combines the oven door sensor (J1) with the...
Page 289 connects the display cable assembly to the display. Agilent 7820 GC Service...
Page 290: Fid Signal Board
FID signal board Part number G3431-60020 Connector Function See also Communications Communication buss. harness Ignitor. Signal from electrometer. Agilent 7820 GC Service...
Page 291: Tcd Signal Board
TCD signal board Part number G3432-60015 Connecto Function See also Filament (upper 2) and  PRT (lower 2) connections. Communications buss. Communication harness Switching valve. Replacing the TCD switching valve Agilent 7820 GC Service...
Page 292: Uecd Signal Board
uECD signal board Part number G3433-60020 Connector Function See also Communications Communication buss. harness Signal from electrometer. NPD signal board Part number G3434-60021 (replaces G3434-60020) Connector Function See also Communications Communication buss. harness Bead power. NPD power cable ( 182) Signal from electrometer.
Page 293: Fid Electrometer Board
FID electrometer board Part number G4331-60015 Connector Function Input from detector. Output to signal board. Agilent 7820 GC Service...
Page 294: Uecd Electrometer Board
uECD electrometer board Part number G4333-60010 Connector Function Output to signal board. Input from detector. NPD electrometer board Part number G4334-60010 Agilent 7820 GC Service...
Page 295 Connector Function Input from detector. Output to signal board. Agilent 7820 GC Service...
Page 296: Fpd Signal Board
FPD signal board Part number G3435-60010 Connector Function See also Communications buss. Communication harness High voltage to photomultiplier. Signal from electrometer. Ignitor. Agilent 7820 GC Service...
Page 297: Illustrated Parts Breakdown
Illustrated Parts Breakdown Overview of the IPB Inlets Detectors EPC modules Nickel catalyst accessory Covers Automatic Liquid Sampler Parts Oven Valves Electrical Overview of the IPB This section consists of parts lists and exploded views of the instrument modules. It is a major reference for part identification and part numbers.
Page 298: Inlets
Inlets This section contains illustrated parts breakdowns for GC inlets and related components.  Split/Splitless Inlet ( 299)  Split/Splitless Inlet Column Liners  Purged Packed Inlet ( 307)  Purged Packed Column Inlet Port Supplies Agilent 7820 GC Service...
Page 299: Split/Splitless Inlet (Ssl)
Split/Splitless Inlet (SSL) Top level subassemblies for SSL inlet accessories:  G4352A 0-60 psi split/splitless inlet accessory kit Item Description Part number SSL Inlet accessory, 0-60 PSIG, G4352-60500 without ship kit SSL Weldment assembly without EPC G4352-60512 module Inert S/SL Weldment Assembly w/inert G4353-60512 liner * EPC Module for SSL inlet...
Page 300: Split/Splitless Inlet
Split/Splitless Inlet Description Part number O-ring, 12/pk (2 for EPC module seal, 2 for 5180-4181 valve seal) Screw, captive, M3 x 8 mm long G3430-20028 Septum nut, standard G4352-60730 Septum, standard See consumables 1 Top insert assembly, standard G4352-60730 Top insert assembly, Inert* G4353-60730 * 7820 Inert SSL Inlet is only for use with inert valve (Opt #711) and only for sale in China.
Page 301: Ssl Split Vent Trap (7820)
SSL Split vent trap (7820) Item Description Part number Trap shell front, brass G1544-20675 Copper tube, 1/8-inch 1/8-inch brass nut and ferrule set 5181-7481 Trap O-ring 0905-1291 Chemical trap assembly G1544-80540 Trap retaining Nut G1544-20650 Trap shell back weldment assembly G3452-60506 O-ring, size 2-006, fluorocarbon, 12/pk 5180-4181 Proportional valve, split vent...
Page 302: Split Splitless Inlet Body
Split Splitless Inlet Body Desciption Part number Screw, M4 x 12 mm, Torx T-20 0515-2496 Inlet weldment G1544-80570 Inert Inlet weldment* G4352-60570 Insulation, top G1544-00010 Heater/sensor assembly G1530-61950 Screw, M5 x 10 mm 0515-4788 Heater block G3452-20500 Insulation block G3452-00002 Insulation bottom G3432-00003 Retaining nut for heater block...
Page 303 Agilent 7820 GC Service...
Page 304: Split Splitless Inlet Warmer
Split Splitless Inlet Warmer Description Part number Insulation 19243-00068 Bottom insulation cover 19243-00070 Screw, M4 x 12 mm, Torx T-20, chrome-plated 0515-2711 Agilent 7820 GC Service...
Page 305: Consumables And Parts For The Split/Splitless Inlet
Consumables and Parts for the Split/Splitless Inlet See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). Split, splitless, direct, and direct connect inlet liners Mode Description...
Page 306 Strain relief septum nut for headspace 6410090050 11-mm septum, high-temperature, low-bleed, 50/pk 5183-4757 11-mm septum, prepierced, long life, 50/pk 5183-4761 Merlin Microseal septum (high-pressure) 5182-3444 Merlin Microseal septum (30 psi) 5181-8815 Nonstick fluorocarbon liner O-ring (for 5188-5365 temperatures up to 350 °C), 10/pk Graphite O-ring for split liner (for temperatures 5180-4168 above 350 °C), 10/pk...
Page 307: Purged Packed Inlet (Pp)
Purged Packed Inlet (PP) Top level subassemblies for Purged Packed inlet accessories:  G4348A Purged-packed with EPC, Kit Description Part number Purged packed inlet accessory without ship kit G4348-60520 Purged packed inlet weldment assembly without G3451-80506 EPC module Purged packed inlet EPC module G4348-60551 Agilent 7820 GC Service...
Page 308: Purged Packed Inlet Upper Body
Purged Packed Inlet Upper Body Item Description Part number Screw, Torx T-20, M4 x 12 mm 1390-1023 Top cover plate G1543-00085 Top insulation G1543-00100 Septum nut 18740-60835 Septum, 11 mm, low bleed 5183-4757 (50/pk) Top insert weldment 19243-80570 Viton O-ring (12/pk) 5080-8898 Screw, Torx T-10, M3 x 16 mm G3430-20028 Inlet weldment...
Page 309 Agilent 7820 GC Service...
Page 310: Purged Packed Inlet
Purged Packed Inlet Item Description Part number PP insulation G3451-00004 PP bottom insulation G3432-00003 PP insulation cup G3431-00005 Retainer ring (C-clip) 0510-1799 Glass liner (25/pk) 5080-8732 Vespel ferrule (10/pk) 5080-8774 Tubing nut (1/4-inch brass), 5180-4105 10/pk Column adapter 19244-80540 Bottom plate for oven G1543-00060 Screw, T-20, M4 x 12mm 0515-2711...
Page 311 Agilent 7820 GC Service...
Page 312: Consumables And Parts For The Purged Packed Inlet
Consumables and Parts for the Purged Packed Inlet See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). Purged packed inlet parts Description Part number Inlet kit, contains septa, 5181-8837...
Page 313 Septum retainers Description Part number Standard septum nut 18740-60835 Headspace retainer nut 18740-60830 Merlin Microseal retainer 5181-8816 Nuts and ferrules for packed columns Description Typical use Part number 1/8-inch id Swagelok 1/8-inch 5080-8751 stainless steel nut, column front ferrule, back ferrule (20 each/pk) 1/8-inch id Swagelok 1/8-inch...
Page 314 Nuts, ferrules, and hardware for capillary columns Column Description Typical use Part number .530 mm Ferrule, Vespel/graphite, 0.45-mm and 5062-3512 0.8-mm id (10/pk) 0.53-mm capillary columns Ferrule, graphite, 1.0-mm id 0.53-mm capillary 5080-8773 (10/pk) columns Column nut, finger- tight Connect column to 5020-8293 (for 0.53-mm columns) inlet or detector...
Page 315 Column cutter, ceramic wafer Cutting capillary 5181-8836 (4/pk) columns Agilent 7820 GC Service...
Page 316: Detectors
 Flame Photometric Detector ( 347) (FPD) Note: The GC 7820A detectors have been redesigned and updated to new version in Jul 2012. Below are the main changes: 1. The UEPC has been replaced by 5 dedicated detector EPCs. 2. The connections between detector and EPC have been changed from thumb nuts to tubing blocks similar to 7890.
Page 317: Flame Ionization Detector (Fid)
Flame Ionization Detector (FID) Top level subassemblies for new version FID accessory:  G4331A FID with EPC (New version detector). Description Part number FID detector body, adaptable, no signal board, no G4331-67518 EPC module, no ship kit (New version detector) FID EPC module (For new version detector) G4331-67531 FID Signal Board...
Page 318 Top level subassemblies for old version FID accessory:  G4346A Universal detector EPC module accessory (For old version detector) Description Part number FID detector body, adaptable, with signal board, G4331-60506 no UEPC module, no ship kit (Old version detector) Universal detector EPC module, (For old version G4346-60531 detector) FID Signal Board...
Page 319: Fid Body
FID body Item Description Part number Screw, M4 × 25 mm, Torx T-20 0515-2712 FID interconnect cover G1531-00220 PTFE chimney (optional) 19231-21050 Collector assembly G1531-60690 Screw, M4 × 10 mm, Torx T-20 0515-2495 Interconnect J-clamp 19231-00040 Mounting pallet, FID G4331-40020 FID Base Assembly Cylindrical EMI suppressor, 9170-1730...
Page 320 Agilent 7820 GC Service...
Page 321: Fid Collector Assembly
FID Collector Assembly Item Description Part number Screw, M4 × 25 mm, Torx T-20 0515-2712 Collector assembly G1531-60690 Collector nut 19231-20940 Spring washer 3050-1246 Ignitor castle 19231-20910 or optional Hastelloy component 19231-21060 Upper/lower collector insulator G1531-20700 Collector body G1531-20690 Spanner nut (collector) 19231-20980 Collector mount G1531-20550...
Page 322: Fid Base Assembly
FID Base Assembly Item Description Part number Base spanner nut 19231-20990 Thermal strap G1531-00105 Screw, captive, M3, T-10 G1946-20168 O-ring, size 2-006, fluorocarbon, 5180-4181 12/pk Jets: see consumables FID base weldment with jet for new G3431-80509 version detector G4331-67000 FID base weldment with jet for old version detector Screw, M4 ×...
Page 323 Agilent 7820 GC Service...
Page 324: Consumables For The Fid
Consumables for the FID See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). FID PM kits Description Part no. Maintenance kit, FID rebuilding G1531-67001 Maintenance kit, FID cleaning G1531-67000...
Page 325: Thermal Conductivity Detector (Tcd)
Thermal Conductivity Detector (TCD) Top level subassemblies for new version TCD accessories:  G4332A TCD with EPC (New version detector) Description Part no. TCD detector module with switching valve, with G4332-60510 logic board, no EPC module, no ship kit (New version detector) TCD EPC module (For new version detector) G4332-67532...
Page 326 Top level subassemblies for old version TCD accessories:  G4346A Universal detector EPC module kit (For old version detectors) Description Part no. TCD module with switching valve, no signal board, G4332-60220 no UEPC, no ship kit, (Old version detector) Universal detector EPC module (For old version G4346-60531 detector) TCD Signal Board...
Page 327: Thermal Conductivity Detector (Tcd)
Thermal Conductivity Detector (TCD) Item Description Part number Screw, M4 × 12 mm, T-20 0515-2496 Thermal cover and insulation assembly G1532-00027 Screw, M4 × 12 mm, T-20 0515-2496 Screw, M4 x 20 mm, T-20 1390-1024 O-ring, fluorocarbon, size 2-006, 5180-4181 12/pk TCD Block assembly, with reference gas switching valve, without Delta PRT.
Page 328 Agilent 7820 GC Service...
Page 329 Reference gas switching valve This valve is located on the EPC module. Description Part number Valve, TCD Switching G1532-60620 Cable, switching valve G1532-60550 Screw, M3 x 12 mm T-10 0515-1084 Clamp, switching valve G3432-20523 Agilent 7820 GC Service...
Page 330: Consumables For The Tcd
Consumables for the TCD See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). Standard parts for attaching columns to the TCD Column Description Unit Part number...
Page 331: Microcell Electron Capture Detector (Uecd)
Top level subassemblies for new version µECD accessories:  G2397AE uECD with EPC (New version detector) Description Part number 7820A replacement ECD cell kit, no signal board, no G2397-60620 EPC module, no ship kit (New version detector) uECD EPC module (For new version detector) G4333-67533 µECD Signal board...
Page 332 G4346A Universal detector EPC module kit (For old version detectors) Description Part number 7820A old version ECD cell kit is NOT orderable, refer to the procedure on next page for replacement µECD Signal board G3433-60020 Universal detector EPC module (For old version...
Page 333: Microcell Electron Capture Detector (Uecd)
Refer to below for parts required and replacement procedure. Parts Required: Description Part number 7820A replacement ECD cell kit, no G2397-60620 signal board, no EPC module, no ship kit (New version detector) Union SS 1/16inch tubing...
Page 334 Use two unions, P/N 0100-0124, to connect the open end of the new uECD tubing to the open end of the gas tubing coming from thumb nuts. When connecting two unions, avoid to mix anode purge and makeup gas. Agilent 7820 GC Service...
Page 335 Microcell Electron Capture Detector (uECD) Description Part number uECD top cover G2397-000 uECD signal wire assembly 19233-606 Anode/Ferrule/Nut assembly (specific license required) orderable uECD thermal cover G1533-000 Thermal cover clip 19233-000 uECD top insulation G1533-000 Screw, M4 × 10 mm, Torx T-20 0515-2495 Clamp, interconnect 19231-000...
Page 336 Description Part number Screw, M4 x 10 mm long, Torx T-20 0515-2495 uECD interconnect assembly G1533-605 Screw, M4 × 10 mm, Torx T-20 to attach 0515-2495 electrometer uECD electrometer without interconnect G4333-600 Upper heated block G1533-205 Heater/Sensor assembly G1533-606 Lower heated block 19233-205 uECD mounting plate G3433-000...
Page 337 Agilent 7820 GC Service...
Page 338: Consumables For The Uecd
Consumables for the uECD See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). uECD consumables and parts Description Part number Fused silica indented mixing G2397-20540 liner Makeup gas adapter...
Page 339 Ferrule, graphite, 0.5-mm id 0.1-mm, 0.2- mm, 5080-8853 (10/pk) 0.25-mm, and 0.32-mm capillary columns Column nut, finger- tight Connect column to 5020-8292 (for .100- to .320-mm inlet or detector columns) .100 and Ferrule, Vespel/graphite, 0.1-mm and 0.2-mm 5062-3516 .200 mm 0.37-mm id (10/pk) capillary columns...
Page 340: Nitrogen Phosphorus Detector (Npd)
Nitrogen Phosphorus Detector (NPD) Top level subassemblies for new version NPD accessories:  G4334A NPD with EPC (New version detector) Description Part number NPD detector body, adaptable, no signal board, G4334-67518 no EPC, no ship kit (New version detector) NPD EPC module (For new version detector) G4334-67502 NPD Signal Board G3434-60021...
Page 341 Top level subassemblies for old version NPD accessories:  G4346A Universal detector EPC module kit (For old version detector) Description Part number NPD body, with electrometer, no signal board, G4334-80508 no UEPC, no ship kit (Old version detector) Universal detector EPC module (For old version G4346-60531 detector) NPD Signal Board...
Page 342: Nitrogen Phosphorus Detector (Npd)
Nitrogen Phosphorus Detector (NPD) Description Part number Screw, M4 × 10 mm, Torx T-20 0515-2495 Hinged cover assembly G1534-80521 Screw, M3 × 8 mm, Torx T-10 0515-2726 NPD bead assembly consumables Screw, M4, Torx T-20 0515-2495 Power cable assembly G3434-60600 Lid weldment G1534-80510 Collector funnel, standard...
Page 343 Description Part number Optional collector funnel with smaller ID is used to reduce peak tailing in phosphorus compounds. If you use this part, you cannot measure column flow or detector flows. Agilent 7820 GC Service...
Page 344 Agilent 7820 GC Service...
Page 345: Consumables For The Npd
Consumables for the NPD See the Agilent catalog for consumables and supplies (currently p/n 5989-9611) for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). Before selecting a jet, see Selecting an NPD jet ( 65). NPD parts Description Part number...
Page 346 Capillary with G1534-80590 0.29 mm 70.5 mm extended jet (0.11 inch) (recommended) Capillary 19244-80560 0.29 mm 61.5 mm (0.011 inch) Capillary, high- 19244-80620 0.47 mm 61.5 mm temperature (0.018 inch) Packed 18710-20119 0.46 mm 63.6 mm (0.018 inch) Nuts, ferrules, and hardware for capillary columns Column id Description Typical use...
Page 347 Column nut, finger- tight Connect column to inlet 5020-8292 (for .100- to .320-mm or detector columns) Ferrule, no-hole (10/pk) Testing 5181-3308 Capillary column blanking Testing-use with any 5020-8294 ferrule Column nut, universal Connect column to inlet 5181-8830 (2/pk) or detector Column cutter, ceramic wafer Cutting capillary 5181-8836...
Page 348: Flame Photometric Detector (Fpd)
Flame Photometric Detector (FPD) Top level subassemblies for new version FPD accessories:  G4345A single FPD with EPC (New version detector) Description Part number FPD Module, Single, no signal board, no G4335-67630 EPC, no ship kit (New version detector) FPD EPC module (For new version detector) G4335-67535 FPD Signal board G3435-60010...
Page 349 Top level subassemblies for old version FPD accessories:  G4346A Universal detector EPC module kit (For old version detector) Description Part number FPD Module, Single, with signal board, no G4345-60660 ship kit, no UEPC (Old version detector) FPD Module, Single, without signal board, G4345-60620 no ship kit , no UEPC (Old version detector)
Page 350: Fpd Inert Transfer Line Parts
FPD inert transfer line parts Item Description Part number O-ring, FPD jet seal, white 0905-1608 Screw, M3 x 12 mm, T-10 0515-1084 Retaining clip 19256-00340 Inert transfer line (new version G3435-60555 detector) G4345-67001 Inert transfer line (old version detector) Heater/Sensor assembly G1535-60620 Capillary adapter seat 19256-21140...
Page 351 Agilent 7820 GC Service...
Page 352: Fpd Ignitor And Heat Shield Assembly
FPD ignitor and heat shield assembly Item Description Part number FPD tube assembly, Aluminum 19256-60700 Emissions block assembly, FPD, 19256-80560 single Ignitor replacement kit 19256-60800 A. O-ring B. Spacer C. Glow plug 0854-0141 Screw, M3 x 66 mm, T-10 0515-0680 Collar 19256-20690 Ignitor cable assembly...
Page 353: Pmt And Bracket Assemblies
PMT and bracket assemblies Single FPD Item Description Part number Chimney back cover G1535-80520 Heater/Sensor assembly G1535-60610 Transfer line support bracket, 19256-00320 single Bracket/Support G1535-00010 Emissions block assembly, single 19256-60650 Filters: Sulfur 1000-1437 Phosphorus 19256-80010 Filter spacer (used only with sulfur 19256-20910 filter) PMT housing assembly...
Page 354: Fpd Lens Assembly
FPD lens assembly Description Part number Clamp 19256-00090 Screw, M3 × 25 (4 required) 0515-0683 Silicone O-ring, 0.926-inch id (orange) 0905-0955 Convex lens 1000-1438 Lens housing 19256-20900 Flange ring 19256-00200 O-ring 12/pk, Fluoroelastomer, 0905-1100 1.239-inch ID Agilent 7820 GC Service...
Page 355: Fpd Covers
FPD Covers Description Part number Single FPD top cover G3435-80500 Electronics top cover G4345-60543 GC7820 Valve install bracket G4341-00071 Aux zone/valve box harness G4350-60660 Agilent 7820 GC Service...
Page 356: Consumables For The Fpd
Consumables for the FPD See the Agilent catalog for consumables and supplies for a more complete listing, or visit the Agilent Web site for the latest information (http://www.agilent.com/chem/supplies). FPD supplies Description Part number/quantity Sulfur filter 1000-1437 Sulfur filter spacer 19256-20910 Phosphorus filter 19256-80010 Exit tube assembly, aluminum...
Page 357 .320 mm Ferrule, Vespel/graphite, 0.32-mm capillary 5062-3514 0.5-mm id (10/pk) columns Ferrule, graphite, 0.5-mm id 0.1-mm, 0.2- mm, 5080-8853 (10/pk) 0.25-mm, and 0.32-mm capillary columns Column nut, finger- tight (for Connect column to 5020-8292 .100- to .320-mm columns) inlet or detector .250 mm Ferrule, Vespel/graphite, 0.1-mm, 0.2- mm, and...
Page 358: Epc Modules
FPD+ (High Temperature FPD) Top level subassemblies for FPD detector accessories: • G4340A Single FPD with EPC, Kit Item Description Part number FPD Module, Single, with EPC and signal G4345-60300 board, no ship kit FPD+ EPC Module G4335-67000 FPD Signal board G3435-60010 Agilent 7820 GC Service...
Page 359 FPD+ Assemblies Table Coupling, ignitor, and exit tube Description Part number O-Ring, 2-010, Fluorocarbon, brown (exit 0905-1014 tube) Exit tube assembly, FPD G3435-60330 Screw, M3 X 6 mm long, pan head 0515-0680 FPD Ignitor cable assembly G3435-60600 Collet, glow plug 19256-20690 Ignitor, cleaned w/copper gasket (for 19256-60750...
Page 360 Table Lens housing Item Description Part number BK7 Convex glass lens, 31.2mm f.l. 1000-1438 O-Ring 2-021 Silicone Rust Color 0905-0955 Clamp 19256-00090 Lens housing G3435-20391 RING, FLANGE 19256-00200 SCREW, 3.0 25 PN TX 0515-0683 O-Ring, Size 2-123, Silicone, Rust Color 0905-1159 Table Brazements and heaters Item Description...
Page 361 Table Brackets, insulation, PMT, and filters Item Description Part number Front detector cover assembly G3435-81330 Chimney insulation G3435-00340 Nut, hex, with lockwasher, M4 0535-0043 Chimney Insulation, Middle G3435-00342 Screw, machine, M4 x 10-mm long 0515-2495 FPD Chimney back 19256-00320 WHC-375 Wire Clip 1400-3196 Filters FPD Sulphur filter 394nm...
Page 362 Table covers (external) Item Description Part number Single FPD top cover G3435-80500 Electronics top cover G4345-60543 GC7820 Valve install bracket G4341-00071 Aux zone/valve box harness G4350-60660 Agilent 7820 GC Service...
Page 363 Agilent 7820 GC Service...
Page 364 EPC modules Each proportional valve requires 2 O-rings (5180-4181, 12/pk). The valve part numbers are for kits, which contain the valve, screws, and a package of O-rings. Inlet modules EPC modules Inlet Part number O-rings G4348-60551 S/SL G4352-60552 Proportional valves Inlet Carrier Split vent...
Page 365 Proportional valves For any proportional valve in the universal EPC module, order replacement part number: G3430-67013. Requires 3 O-rings. PCM modules EPC module Descriptio Part number O-rings G3476-60501 Proportional valves Module Carrier G3430-67013 G3430-67016 Lookup Table Each proportional valve has a part number on the valve. This table lists the reorder part number for each proportional valve.
Page 366: Nickel Catalyst Accessory
Top level subassemblies for the nickel catalyst accessory:  G4337A Nickel Catalyst Kit (This accessory includes the same parts as the 7890A nickel catalyst accessory, plus fittings required only for the 7820A old version detectors.) Item Description Part number Nickel catalyst assembly (items 2...
Page 367 Install NCT to 7820A FID (For new version detector) Agilent 7820 GC Service...
Page 368 Install NCT to 7820A FID (For old version detector) 1. Cut FID makeup+hydrogen tubing between the "T" connector and FID body. 2. Cap the open end of the makeup+hydrogen tubing from the FID body using union 0100-0124 and stainless rod 07680-81150.
Page 369: Covers
Covers Covers Description Part number Pneumatics cover G4350-60546 Inlet cover (includes 7 screws to G3430-60540 attach to inlet carrier) Screw, M4, T-20 Torx 0515-2496 Plastic washer 3050-2342 Cover, left side, with plugs G4350-00070 1 1/2-inch hole plug 5040-4643 Sheet metal insert G4350-00022 Detector cover G3430-40007...
Page 370 Agilent 7820 GC Service...
Page 371: Mainframe
Mainframe Description Part number Inlet chassis G1530-40020 Agilent 7820 GC Service...
Page 372: Automatic Liquid Sampler Parts
Automatic Liquid Sampler Parts Table 8. Mounting and parking posts Description Part number Injector mounting post G4513-20561 Parking post, dual purpose 05890-61525 Agilent 7820 GC Service...
Page 373 Automatic liquid injector controller Top level subassembly  G4350-63529, ALS Controller Assembly Description Part number RS-232 cable (control box to A&P G2612-60510 board) Control box assembly G4350-60529 Screw M4 x 12 mm long, T-20 0515-2496 Shield, metal* G4350-00152 * Small metal shield is used to cover the open hole in the GC chassis after removing the ALS control box assembly.
Page 374: Oven
Oven This section contains illustrated parts breakdowns for the following GC components:  Oven  Oven flapper assembly Oven assembly Description Part number Fan blade, stainless steel, and set 05890-80270 screw Oven heater shroud assemblies: –100V Power G1530-61610 –120V Power G1530-61610 –200V Power G1530-61640...
Page 375 Agilent 7820 GC Service...
Page 376: Oven Flapper Assembly
Oven flapper assembly Description Part number Qty Oven exhaust duct and flapper assembly (includes G1530-60770 1 3 captured screws 1390-1023) Dual duct assembly G1530-80680 1 Flapper shaft assembly G1530-80560 1 Screw, Torx T-20, M4 x 12 mm 0515-2496 Stepper motor assembly G1530-60940 1 Screw, Torx T-10, M3 ×...
Page 377 Oven door assembly Description Part number Qty 7820 Oven Door Assembly G4350-60502 1 Agilent 7820 GC Service...
Page 378: Valves
Valves Top level subassemblies for Valve accessories:  G4341A Valve box for one valve, Option 751  G4342A Valve box for two valves, Option 752 This section contains illustrated parts breakdowns for the following 7820 GC valves and related components: ...
Page 379 Agilent 7820 GC Service...
Page 380: Valve Driver Assembly
Valve driver assembly Item Description Part number Solenoid valve end plate kit G1580-61097 Elbow fitting 5185-8385 Captured screw, M4, 12 mm long, Torx 1390-1023 Valve driver bracket G4341-00071 Valve driver wiring harness (3 valve G4350-60661 connectors) Valve driver wiring harness (2 valve G4350-60660 connectors) Adapter fitting...
Page 381 Agilent 7820 GC Service...
Page 382: Valve Actuator Assembly (1 Of 2)
Valve actuator assembly (1 of 2) Item Description Part number Valve actuator assembly 19325-60660 Modified screw 19325-80030 Quick-release pin 1480-0632 Hose fitting 5185-8386 PTFE tubing 5m, 1.5mm ID, 3mm OD 5062-2483 36° Actuator limiter 18900-21000 End cap 19325-20680 Elbow fitting 5185-8385 Coupler/Shaft assembly G1580-60640...
Page 383: Valve Actuator Assembly (2 Of 2)
Valve actuator assembly (2 of 2) Description Part number Cylinder end cap 19325-20680 O-ring, 1.176-inch id 0905-1405 O-ring, 1.046-inch id 0905-0463 Piston 19325-20640 Actuator cylinder 19325-20630 Hose fitting 5185-8386 PTFE tubing 5m, 1.5mm ID, 3mm OD 5062-2483 Piston rod 19325-20650 Dowel pin 1480-0017 Link...
Page 384: Valco W-Series Minivalve
Valco W-series minivalve Description Part number Valve Gas sampling valves 5062-9508 – 6-port valve (225  °C max) – 6-port valve (350 °C max) 0101-0584 – 6-port valve (Hastelloy, 225 °C max) 5062-9509 5062-9510 – 10-port valve (225  °C max) –...
Page 385 Agilent 7820 GC Service...
Page 386 7820 Transfer line Switch Top level subassemblies for 7820 transfer line switch accessory:  G4358A 7820 Transfer line switch. This accessory can simplify the operation for switching from7697A HS or 7667 mini to ALS or manual liquid injection. G4358A won’t be needed when 7697A HS is installed with 2nd PCM (option 200, G4562A) G4358A can’t be installed on non-7820 GC inlet.
Page 387: Electrical
Electrical This section contains illustrated parts breakdowns for the following GC electrical components.  Electronics carrier  Keypad and display  AC power  AC power components  AC board components  Transformer  Power cords  Chassis Fans Electronics carrier Description Part number Qty Harness, inlet/detector heater...
Page 388 Agilent 7820 GC Service...
Page 389: Display And Keyboard
G4350-60568 -- Display and keypad assembly, Russian, NOT ORDERABLE 7820A Keypad was redesigned in May 2012. The old version Panel Board Assembly was replaced with the new version (P/N G4350-60558). All support parts were changed except for the VFD display. Refer to service note 7820A-34.
Page 390: Ac Power Components
Note: Picture above shows the old version panel board assembly. If customer is experiencing failures on old version panel board and the problem happened on those parts except for VFD display, the old version Panel Board Assembly should be replaced with the new version G4350-60558.
Page 391 AC power components Description Part number AC Control cable G3430-60512 Transformer, universal, kit. Includes large G4350-60975 washers. Hex bolt, M8 x 90 mm long 0515-4237 On/off rod G3430-40023 Hex nut/lockwasher, for ground wire 0535-0043C Power cable assembly (includes power cord receptacle, 2 wires, and ground wire) -- 100 V power G1530-61560...
Page 392 Agilent 7820 GC Service...
Page 393: Ac Circuit Board Components
AC circuit board components Item Description Part number AC power board (without triac kit) -- 100-120 VAC power G4350-61060 -- 200-240 VAC power G4350-61050 Power configuration cable G4350-60550 Ceramic fuse, type x, 20A/250V 2110-0098 Glass fuse, type F -- 8 A/250 V (used for 100-120 VAC board 2110-0036 G4350-61060) -- 6 A/250 V (used for 200-240 VAC board...
Page 394: Ac Power Kits
AC power kits Use an AC power kit to convert the GC from one power configuration to another, or to replace multiple AC power components. Each power kit contains the following parts for the selected power configuration:  Voltage label (for the back of the GC) ...
Page 395: Main Transformer
Main transformer Part number G4350-60975 Agilent 7820 GC Service...
Page 396: Power Cords
Korea C19, 15A 8121-1222 Thailand C19, 15 8121-1301 A, 1.8M Brazil 8121-1787 The 7820A uses detachable power cords. Description Part number Inlet fan assembly G3430-60590 Pneumatics area fan G3430-60006 Screw, M4 x 30 mm, T-20 (to attach 0515-0669 fan to pneumatics carrier)
Page 397: Chassis Fans
Chassis fans Agilent 7820 GC Service...

Agilent Technologies 7820A Service Manual

Notices

1 Before Servicing the Instrument

Safety

Hand Tools

Specialized Tools

Electronic Tools

Pneumatic Tools

For Checking Inlet Pressure

2 Inlets

Inlet Overview

Split/Splitless Inlet

Purged Packed Inlet

3 Detectors

About the Detector Signal Boards

Detector Overview

Accessing Detector Signal Boards

Replacing Detector Signal Boards

Flame Ionization Detector (FID)

Nitrogen Phosphorus Detector (NPD)

Thermal Conductivity Detector (TCD)

Micro-Cell Electron Capture Detector (Uecd)

Flame Photometric Detector (FPD)

4 EPC Modules

EPC Overview

Repairing EPC Modules

Accessing EPC Modules

Replacing the EPC Modules

Replacing EPC Module Proportional Valves

5 Performance Verification

About Chromatographic Checkout

To Prepare for Chromatographic Checkout

To Check FID Performance

To Check NPD Performance

To Check TCD Performance

To Check Uecd Performance

To Check FPD Performance (Sample 5188-5953)

6 Configuration

Configuration Overview

GC Modules and the Communications Buss

To Configure an MSD Transfer Line

To Configure a Valve Box

Replacing a GC Module

Removing a GC Module

Changing the GC Configuration

Configuration Locks

Installing New Devices

Configuring Time

7 External Cabling

Connectors on the Back of the GC

Remote Start/Stop

Automatic Sampler for GC

Analog Signal Outputs

8 Internal Cabling

Internal Cabling Overview

Ignitor Cable, FID

NPD Power Cable

Motor Harness & AC Control Assembly

AC Power Inlet Assemblies

Inlet/Detector Heater Harness

Aux Heater/Valve Box Harness

Communications Harness

7820 GC/MS Second Inlet Upgrade Harness

Keyboard Display Cable

Display Cable Assembly

9 Mainframe

Mainframe Overview

Covers and Fans

Replacing the Oven Door

Oven Temperature Control

Oven Temperature Troubleshooting

Measuring Inlet and Detector Heater and PRT Resistance

Testing Resistance of the Oven Heater Coil203

Replacing the Oven Shroud, Oven Fan, and Oven Fan Motor

Replacing the Oven Flapper Assembly

Replacing Components Inside the Electronics Panel

Replacing Components Inside the Lower Rear Metal Cover

10 Valves

Valves

Valve Box