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Agilent Technologies 6850 Series Service Information
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Agilent Technologies 6850 Series Service Information

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6850 Series GC System Service Information
Contents
Covers
Inlets and valves
Released: April 2004
Part No. G2630-90649
1

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Summary of Contents for Agilent Technologies 6850 Series

  • Page 1: Table Of Contents

    6850 Series GC System Service Information Contents Electronics Introduction Covers G2629A Control Module Manuals and other parts Inlets and valves Troubleshooting Detectors Oven Released: April 2004 Part No. G2630-90649...

  • Page 2: Introduction

    Introduction About this manual About this edition Safety information How to use this manual Tools and test equipment Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 3 All Rights Reserved. Reproduction, adaptation, or the physical and safety requirements of working translation without permission is prohibited, on the 6850 series gas chromatograph (GC). except as allowed under the copyright laws. These procedures supplement the operation and Part No. G2630-90649...
  • Page 4 Bei Betrieb des 6850 mit Cryo Ventil Option upright position by two people supporting the treten beim Oeffnen des Ventils impulsfoermig bottom of the unit. Schalldrucke Lp bis ca. 92.5 dB(A) auf. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 5 • Changes or modifications not expressly • Relocate the radio or antenna. approved by Agilent Technologies could void the user’s authority to operate the equip- ment. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 6 Agilent Technologies assumes no liability for the customer’s failure to comply with these requirements. WARNING A warning calls attention to a condition or possible situation that could cause injury to the user. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 7 Acrobat “Go to Previous View” Indicates earth (ground) terminal. button until you reach the correct page. Indicates explosion hazard. Indicates electrostatic discharge hazard. Indicates a radioactivity hazard. Indicates a pinch hazard. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 8 7-mm hex nut driver Handheld electronic leak detector, 110 V No. 1 Posidriv screwdriver Handheld electronic leak detector, 220 V No. 2 Posidriv screwdriver, 4-inch shaft Agilent GC Firmware Update Utility or greater Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 9 Internal covers Raising the lid to the service position Detector electronic cover and column Electronics cover hanger Front cover (with keyboard and Connector cover plates (in lid) display) Lid top cover Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 10 Replacement parts External covers Detector cover Screw, shoulder, G2630–40140 M4 x 9 mm 0515–3005 Marquee G2630–40170 Front panel housing G2630–60630 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 11 External covers, continued Screws, M4 × 12 mm 3-way valve assembly mount 0515–2496 G2630–80640 Supply tubing assembly G2630–60650 Back panel G2630–00030 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 12 Internal covers Lid switch pin G2630–20870 Detector electronics cover G2630–00290 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 13 Internal covers, continued Electronics cover G2630–00220 Switch assembly 3101–3558 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 14 Detector electronic cover and column hanger Detector electronics cover G2630–00290 Column hanger, obsolete, order G2630-80800 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 15 Connector cover plates (in lid) Pneumatics connector covers G2630-00680 Screw, M4 x 12 mm (8 plates) 0515-2556 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 16 3. Remove the seven T-20 Torx screws on the back cover. 4. Replace the cover. Then, reinsert and tighten the screws. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 17 When closing the lid, have someone else hold the lid for you. Never disconnect the safety wire. If the safety wire is disconnected, the GC can become unbalanced. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 18 To remove the electronics cover: 1. Open the lid. Stop plate 2. Raise the lid to the service position. See Screw “Raising the lid to the service position” page 1-17 for details. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 19 3. Remove the two T-20 Torx screws shown below and loosen the two 7-mm nuts. Remove screws Loosen nuts 4. Slide the electronics cover off the instrument. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 20 Burn hazard. The oven may be very hot. Before beginning, turn off the oven and allow it to cool. Caution Be careful not to pull the metal contacts off of the switch when disconnecting the wires. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 21 Remove these screws 4. Press the two lid latch release buttons (on 2. Open the lid. either side of the instrument’s front, toward the top) until they disengage from the front panel. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 22 2. Insert the lower edge of the front cover first, then tilt up into place. Depress the lid latch release buttons, if needed. The buttons should work the latches freely. 3. Install the four mounting screws. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 23 Remove vent lines, Remove T-20 if installed Torx screws (8 places) Lift off detector cover (if desired) µ Lid top cover (for FID/TCD/ ECD) without valve box accessory is shown. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 24 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 25 Injection port cooling fan Purged packed inlet Split/Splitless inlet Cool on-column inlet Purged packed inlet service Programmable temperature Cool on-column inlet vaporization inlet (PTV) PTV inlet Inlet flow modules Valves Fans Valves Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 26 (order no. 5180-4182, 12/pk) 7. Split vent flow line G1544-20620 15. Inlet liner, split mode, standard* 5183-4647 (14.2 in. long × 0.125 in. id) *Also see the Agilent chemical analysis consumables and accessories catalog. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 27 New? Continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 28 19. Screw, M4 x 8 mm, Torx T-20, 0515-2711 chrome plated 20. Washer, 12/pk 5061-5869 21. Thermal block G1544-20570 22. Block insulation G1544-00020 23. Insulation, lower G1544-00030 24. Top insulation G1544-00010 New? Continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 29 Solid (no hole) ferrule plug 5181-7458 Graphite ferrule 0.5-mm id (10/pk) 5080-8853 Graphite ferrule 1.0-mm id (10/pk) 5080-8773 33. Column nut 5183-4732 *Also refer to the Agilent chemical analysis consumables and accessories catalog. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 30 Split/Splitless inlet flow module Split/Splitless inlet module assembly kit G2630-61240 For replacement parts for any inlet flow module, “Any inlet flow module” on page 1-42. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 31 9. Viton O-ring (12/pk) 5080-8898 10. Heater/sensor assembly G1543-61540 11. Screw, Torx T-10, M3 x 16 mm 1390-1022 12. Inlet weldment G1543-80580 13. Top gasket insulation (not shown) G1543-00155 14. Thermal block G1543-20765 Continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 32 23. Nutwarmer cup 19234-60700 24. Ferrules (identify by internal dia.): Solid ferrule plug (no hole) 5181-7458 Graphite ferrule 0.5-mm id (10/pk) 5080-8853 Graphite ferrule 1.0-mm id 5080-8773 25. Column nut 5183-4732 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 33 10. Insert spring 19245-60760 18. Column nut (Order no. 5181-8830 18740-20870 2/pkg) 11. Inserts (identify by number of rings on insert): –Narrow bore insert; 200 µ – 19245-20510 1 silver ring Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 34 Figure 1-1. Exploded diagram of the cool on-column inlet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 35 2. Inlet block fitting G1543-20610 3. EPC valve replacement kit G1531-60610 4. Screws, inlet block, M3 × 12 mm, 0515-1084 not shown Front view Rear view Old? Figure 1-2. Cool on-column pneumatic module Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 36 Merlin assemblies. 0.32-mm column id (10/pk) 5182-9769 **Service kit, part no. 5182-9747, consists of items 20, 21, and 22. 0.53-mm column id (10/pk) 5182-9770 11. Split nut for inlet adapters 5062-3525 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 37 14, 15 6, 7 Figure 1-3. Exploded diagram of the programmable temperature vaporization inlet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 38 1. PTV thermocouple PCB G2617-60010 2. PTV thermocouple PCB cable G2617-60505 3. Calibrated module assembly G2617-60500 4. Male connectors 1/8-inch G1543-80030 Swagelok 5. Inlet fitting block G1543-20510 Old? Figure 1-4. PTV flow module Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 39 4. Cap prot W/O Flg 1401-0044 5. Scr-mach 8-32.375-inch 2510-0102 Figure 1-5. PTV LCO cryo assembly 6. 1/8-inch male conn W/O O-ring G1543-80025 7. Gland seal LCO G1565-20590 8. TFE seal G1565-20840 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 40 9. Nut 1/4-inch tubing SS (not shown) 0100-0055 10. Connector (not shown) 0100-0112 11. Connector—male (not shown) 0100-0208 12. 1/4-inch ferrule set SST (not 0100-1827 shown) Accurate? 13. Tape—industrial (not shown) — — Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 41 Inlet flow modules Purged packed inlet Purged packed inlet module assembly kit G2630-61245 For replacement parts for any inlet flow module, “Any inlet flow module” on page 1-42. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 42 Screw, M3 ×12 mm, Torx T-10 0515-1084 Inlet fitting G1543-20610 Old? 1/4-inch Viton O-ring 5180-4182 (12/pk) Back left view Front right view Continued Figure 1-7. Inlet flow module replacement parts (split/splitless shown) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 43 M3 x 20 mm, Torx T-10 G1531-60610 0515-1319, Qty 2 (Includes O-rings, excludes screws) Supply fitting O-rings, 5180-4181 (12/pk) Split vent on/off valve G1544-60580 Inlet split vent fitting Accurate? Septum purge fitting Split/Splitless inlet shown Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 44 Fans Injection port fan assembly G2630-61320 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 45 G2630-80500 Valve heated block G2630-20710 Screw 0515-0655 Washer 3050-1977 Gas or liquid sampling valve: see Table 1-1 Gas sample loop: see Table 1-1 Heater/sensor assembly G1544-61140 Accurate? Gas sampling valve Continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 46 Diaphragm (for gas or liquid valve) 0101-0760 Valve box lid G2630-00730 Valve box chassis G2630-61400 Valve inlet insert assembly G2630-61080 Inlet chassis G2630-40210 Continued Figure 1-8. Sampling valve replacement parts, continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 47 Male connector, brass 0100-2023 1.0 mL 0101-1020 Male connector, SS 0100-2022 2.0 mL 0101-1019 Sampling valve (not shown) Liquid line out G2630-80650 Metering valve (for liquid sampling 0101-0355 valve) Tubing G1205-21430 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 48 0100-1527 Liner tool 18900-20850 530 µm column union 0100-1515 1/8-inch to 1/16-inch reducing union, 0100-1542 Liner for 530 µm SS nut, 1/16-inch columns, 0100-1513 0100-1511 Liner for 320 µm columns, 0100-1514 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 49 12. Heater/Sensor assembly G1580-61140 13. Cable-tie strap (not shown) 1400-0249 14. Aluminum tube (split/splitless inlet 18900-20320 only) (not shown) 15. In-line filter (sample in line) (not 0101-0532 shown) Figure 1-9. Valve box assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 50 9. Solenoid valve end plate kit 05890-61097 10. Screw, skt hd cap 0515-1214 11. Elbow fitting, 1/4-inch, male 0100-1632 12. Exhaust tubing, 1/4-inch od, 120 0890-1489 inch 13. Heater cable assembly (not shown) G1530-60790 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 51 NO TAG Figure 1-10. Valve driver assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 52 6. 36° Actuator limiter 18900-21000 7. End cap 19325-20680 8. Elbow fitting, 10 to 32 0100-1220 9. Coupler/Shaft assembly G1580-60640 NS Hex key, 3 mm (not shown) 8710-0911 — Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 53 Continued Figure 1-11. Valve actuator assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 54 7. O-ring, 0.239-inch id 0905-0103 8. Actuator cylinder 19325-20630 9. Piston 19325-20640 10. O-ring, 1.046-inch id 0905-0463 11. O-ring, 1.176-inch id 0905-1405 12. Cylinder end cap 19325-20680 13. Elbow fitting 0100-1220 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 55 Figure 1-12. Valve actuator assembly, continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 56 – 0.2 µL 4-port (1000 psig max) 5062-3563 (0.5 µL, 1000 psi, Option 852) – 0.5 µL 4-port (1000 psig max) 5062-3562 – 1.0 µL 4-port (1000 psig max) 5062-3559 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 57 Valve Ferrule Rotors Preload assembly Figure 1-13. Valco W-series minivalve Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 58 Part no. 18900- 18900- 20260 21110 18900- 1061 18900- 20300 21120 3658 5021-7199 2132 18900- 21130 See the Agilent chemical 4274 18900- analysis consumables and 21140 accessories catalog for more lengths Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 59 8. Top cover plate G1543-00085 9. Top insulation G1543-00100 10. PPIP Insulation G1543-00030 11. PPIP Bottom insulation G1543-00070 12. Nut warmer insulation 19234-60715 13. Nut warmer cup 19234-60700 Figure 1-14. Nickel catalyst assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 60 2. Remove the top cover. See “Lid top cover” page 1-23. 3. Unscrew three T-10 Torx screws and remove the fan. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 61 1. Load the SERVICE method (or turn off the GC) and allow the inlet to cool. 2. Remove the top cover. See “Lid top cover” page 1-23. 4. Lift the inlet insert weldment free of the inlet. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 62 Split vent trap fitting. bracket Inlet flow module 7. Disassemble the split vent trap. Gang block fitting 8. Remove the inlet insert weldment and attached parts from the instrument. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 63 GC) and allow the inlet and oven to cool. 2. Remove the top cover. See “Lid top cover” page 1-23. 3. Disconnect the column from the inlet. 4. Remove the insulation cup. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 64 Split vent line Liner and O-ring 9. Remove the split vent line from the inlet. Insert 10. Loosen the three T-20 Torx screws that weldment secure the inlet to the lid. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 65 Shell weldment Disconnect heater/sensor cable 12. Lift out the inlet assembly. Heater block 3/4-inch nut Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 66 2. Turn off the carrier gas at its source. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 67 3. Lower the inlet assembly into the block insu- to the wiring harness connector. Disconnect lation sleeve. Route the module tubing along it at the harness. the side of the lid. Place the module assem- bly into its slot. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 68 Force it up until the bottom cover plate can rest flush with the oven top. Secure the cover plate with two screws. 9. Install the cup insulation and the cup. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 69 8. Remove the three T-20 Torx screws holding 2. Turn off the carrier gas at its source. the inlet in the lid. 3. Remove the lid top cover. See “Lid top cover” on page 1-23. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 70 11. Lift the inlet out of the instrument. Inlet weldment Thermal block Bottom nut Figure 1-16. Removing the thermal block Figure 1-15. Removing the top inlet plate Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 71 Liner, polyamide, for 530 µm 0100-1513 6850 GC must have a purged packed inlet. columns Liner, polyamide, for 320 µm 0100-1514 columns SS nut, 1/16-inch 0100-1511 1/8-inch to 1/16-inch reducing 0100-1542 union Liner tool 18900-20850 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 72 4. Remove the screw and washer that hold the cooled. inject line onto the valve heated block. Disconnect inject line Remove screw and washer Figure 1-17. Disconnect the inject line from the valve Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 73 If left unprotected, insulation will Oven lid through be trapped in the tubing! hole (Liquid sampling valve shown) Figure 1-18. Location of oven lid through hole Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 74 Install the screw and washer (removed column. under “Disconnect the existing inject line” above) through the direct-tube assembly coil and secure it to the valve heated block. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 75 • For 530 µm columns, install part number 0100-1515 • For a 1/8-inch packed column, install the 1/8-inch to 1/16-inch ZDV reducing union Figure 1-19. Union installed onto the direct- tube assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 76 2. Make sure the pressure at the carrier gas 7. Set the inlet pressure to 25 psi. supply is at least 35 psi. If pressure cannot be reached, there is a gross leak. Check the column cap. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 77 1. From inside the oven, remove the column from the inlet fitting. 2. From the top of the 6850 GC, remove the blue inlet carrier cover (or the tray bracket, if installed) and the left side cover. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 78 The tubing labelled “C” is connected to the Forward Pressure Regulator. The line labelled “P” is connected to the septum Figure 1-20. Disconnecting the inlet purge regulator. plumbing block (EPC inlets) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 79 1. If necessary, remove the septum nut, cooling tower and/or needle guide to provide access to the two screws in the top of the cooling Figure 1-21. Removing the inlet from the top fin. of the GC Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 80 Figure 1-22. Removing the heater/sensor Preparation assembly from the top of the 1. Cool the column to ambient. 2. Remove the column from the inlet fitting on the inside of the oven. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 81 3. If the quality of the septum is unknown, replace it now. Septum retainer Septum Spring Insert Figure 1-23. Location of septum Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 82 0.5-mm id graphite ferrule may be used for the inlet column fitting. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 83 Cap the inlet column fitting (column nut using no-hole ferrule shown) Split vent Septum vent Figure 1-24. Capping the bottom of the inlet and septum purge vent Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 84 • If pressure loss is much greater than1.0 psi, there is a leak that must be found and corrected. See“Replacing the plumb- ing assemblies” later in this section. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 85 1.0 psi in the module. Remove the plumbing block from 10 minutes is considered leak tight. the EPC module, being careful not to lose the O-rings between the block and the module. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 86 2. Check the actual pressure on the display and inlet fitting. monitor it for 10 minutes. Pressure loss 3. Remove the top plastic pneumatics cover and should not be greater than 0.5 psi. the detector cover. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 87 EPC board. Figure 1-25. Leak testing the EPC module on 8. Reconnect the carrier supply fitting and set the lab bench pressures as used in the leak test. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 88 Other- wise, replace the EPC module. See the following diagram of serviceable parts, Figure 1-28. Aluminum bracket O-rings Supply fitting O-ring Septum purge fitting Figure 1-26. EPC module serviceable parts Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 89 7. Loosen the three captive Torx screws which secure the inlet to the oven, and lift the PTV 5. Remove the top mounting screw in the PTV inlet out of the oven. module assembly. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 90 Loosen screws Figure 1-28. Removing the PTV inlet 8. Remove the heater connector from the side panel. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 91 Disconnect the module ribbon cable from the pneumatics board. 11. Removing the entire PTV assembly. 12. Replace the PTV assembly and flow module and re-assemble in reverse order. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 92 PTV inlet out of the oven. Figure 1-30. PTV with cooling assembly 1. Turn off the inlet and allow the inlet to cool. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 93 Failure to do this could break the fitting on the inlet. Remove gas lines Figure 1-31. Removing the gas lines from the inlet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 94 GC. the inlet. 9. Remove (unscrew) the head from the inlet. Remove connectors Disconnect cable Figure 1-32. PTV electrical connections Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 95 2. Remove the PTV inlet as described under Replacing the PTV with cooling assembly. 3. Remove the three screws on the cryo assem- bly from the PTV inlet, and remove the cryo assembly. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 96 PTV inlet PTV inlet with cooling assembly Inlet cryo assembly Remove screws Figure 1-33. Removing the inlet cryo assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 97 2. Remove the top cover, the inlet fan cover, plumbing is disconnected from the inlet. the inlet cover, the left side panel, the top rear panel, the pneumatics chassis cover, and the RFI cover. 3. Remove the column. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 98 Figure 1-34. Removing the module mounting screw 5. Disconnect the module ribbon cable from the pneumatics PCB. Disconnect the cryo cable, power cable, and thermocouple cableconnectors from the PTV thermocouple PCB on the module. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 99 Filter and O-rings (2) (not shown) PTV front trap assembly Filter and O-rings (2) (not shown) PTV SMLS PTV front trap gang weldment assembly Figure 1-35. PTV Plumbing Assemblies Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 100 4. Replace the module assembly and plumbing them to cool. and reassemble in reverse order. 2. Turn off the oven and the inlet and allow 5. Check the system for leaks. them to cool. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 101 7. Loosen the three captive Torx screws which 10. Unscrew the filter assembly and remove the secure the inlet to the oven, and lift the PTV PTV front trap assembly. inlet out of the oven. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 102 Filter and O-rings (2) (not shown) PTV front trap assembly Filter and O-rings (2) (not shown) PTV SMLS PTV front trap gang weldment assembly Figure 1-36. PTV plumbing assemblies (septumless head shown) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 103 1. Turn off the oven and the inlet and allow tap the fitting to remove the restrictor for them to cool. cleaning/replacement. Inspect the O-rings and replace if necessary. 4. Reassemble in reverse order and check the plumbing for leaks. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 104 RFI cover, and the pneumatics chassis cover. 3. Remove the PTV module as described in Replacing the PTV module assembly. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 105 PTV module assembly PTV thermocouple PCB Remove 2 screws Figure 1-37. Replacing the PTV thermocouple PCB Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 106 Graphpack–2M ferrules are sized to the column outer diameter. 3. Remove the pneumatics cover. Column id Graphpack Part no. (mm) ferrule hole id (mm) 0.31 5182-9756 0.40 5182-9768 0.45 5182-9769 0.70 5182-9770 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 107 10 mm from column end into the adapter. the column end to eliminate graphite contam- ination. 17 mm Mark column here Figure 1-38. Column installation Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 108 4. Screw the new head onto the inlet. Tighten it 1/8 turn past finger tight. Figure 1-39. Removing the carrier gas line 5. Reconnect the carrier gas line. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 109 If necessary, tighten them again by hand. Replacing the Teflon ferrule 1. Unscrew the guide cap from the septumless head and remove the Teflon ferrule. Figure 1-40. Installing a Teflon ferrule Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 110 4. Tighten the guide cap until resistance is first felt. 5. Check for leaks when the syringe needle has been fully introduced. 6. If necessary, carefully tighten the guide cap until the inlet stops leaking. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 111 2. If replacing the septum head, disconnect the split vent and septum purge lines. 3. Use a 5/8-inch wrench to loosen the retain- ing nut on the septum head. Figure 1-41. Removing the septum head Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 112 6. Tighten the retaining nut 1/2 turn past finger tight. 2. Unscrew (counterclockwise) the septum cap or Merlin cap. 7. If the carrier gas and septum purge lines were removed, reinstall them. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 113 5. Check for leaks out of the cap and tighten the cap if necessary. Replacing the liner Figure 1-43. Installing the ferrule onto the 1. Remove the head from the inlet. new liner Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 114 1 mm of liner exposed. Check that and the inlet temperature shuts down. the graphite within the ferrule is flush with the top of the metal collar. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 115 If the heater remains on at full power for 3D ferrule on the glass liner are unknown, more than 2 minutes, the heater is shut down. replace them now. The GC beeps and displays this message: Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 116 A capillary column nut with a solid piece of wire the size of a paper clip and a 0.5 mm id graphite ferrule may be used for the inlet column fitting. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 117 Cap the inlet column fitting Split vent Septum vent Figure 1-44. Capping the bottom of the inlet and septum purge vent Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 118 Press [Front Inlet] (or [Back 3. Set the inlet’s Total Flow to 60 mL/min. Inlet]), scroll to the “Pressure” field, and press [Off]. Both the flow controller and the back pressure valves will close. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 119 EPC module separately. • If pressure loss is much greater than 0.5 psi, there is a leak that must be Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 120 6. If there is an increase in pressure, see the following Forward pressure valve leaks The leak test block is a special fitting that procedure. plumbs the carrier gas coming out of the Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 121 EPC module only): benchtop for testing. 1. Remove the supply pressure at the carrier inlet fitting, and quickly cap the fitting with a solid 1/8-inch Vespel plug and a Swagelok nut. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 122 4. Disconnect the ribbon cable for the module leaky component on the module. from the main EPC board. You may have to remove the adjacent ribbon cable also. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 123 Figure 1-45. Leak testing the EPC module on the lab bench Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 124 8. If the leaky component is serviceable, such as a vent/inlet fitting (see diagram of ser- viceable parts, Figure 1-49.), replace it. Otherwise, replace the EPC module. Figure 1-46. EPC module serviceable parts Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 125 • The area where gas line(s) are plumbed to the pressure drops faster than the acceptable the inlet rate, continue to search for leaks and repeat the pressure test. • The capped purge vent Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 126 5. Switch the solenoid valve off so the actuator is in its fully extended position (piston rod 1. Place the main power switch in the off posi- extended as shown). tion. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 127 Torx T-20 screws, hex nut, and mounting bracket for each restrictor valve. 10. Exercise the valve(s) on and off a few times to verify operation. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 128 (installed using two Torx T-20 screws). • Six port valves—Remove the pin from the 60° hole • Ten port valves—Same as six port valves, but with the tubular 36° actua- tor limiter on the pin. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 129 Loosen the set screw. Figure 1-49. Removing the mounted actuator on the valve box 3. Disengage the actuator drive shaft coupler Figure 1-50. Disengaging the actuator drive with the valve. shaft with the valve Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 130 The valve driver block accommodates up to four in the orientation shown. Install two O-rings valve drivers. A valve driver must be installed for in the valve driver supply/exhaust ports as each valve/actuator installed. shown. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 131 O-rings in the same manner as the first. 6. When all the drivers have been installed, screw on the other end plate with the two Figure 1-52. Assembling the valve driver hex screws as shown. block Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 132 2. Slide the new valve driver block into the driver bracket until the drivers plug into the Figure 1-53. Installing the cabling connectors. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 133 Figure 1-55. Installing the supply fitting, 4. Wrap the threaded ends of the 90° elbow fit- tubing connectors, and actuator ® ting in Teflon pipe tape. Screw the fitting tubing Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 134 The tubing from the side of the actuator goes to the connector farthest from the main board. Grip the tubing with a piece of sandpaper and push it onto the tubing connector. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
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  • Page 139: Detectors

    Replacement Parts Replacement Procedures Thermal conductivity detector Thermal conductivity detector Flame ionization detector Microcell electron capture detector Microcell electron capture detector Flame photometric detector Flame photometric detector Flow module Electronics board Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 140 * For TCDs manufactured before June 1997, order upgrade kit 9. TCD capillary G1532-80540 – G1532-60540 to replace TCD signal board part no. G1532-60010. 10. – 1/8-inch nut (10/pkg) 5180-4103 – 11. – 1/8-inch vespel ferrule, 0100-1332 – graphitized (10/pkg) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 141 Figure 1-1. Exploded diagram of the thermal conductivity detector Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 142 G1531-20700 9. Collector body G1531-20690 10. Spanner nut (collector) 19231-20980 11. Collector mount G1531-20550 12. Collector housing G1531-20740 13. Gasket 5180-4165 14. Screw, M4 × 25 mm, Torx, T-20 0515-2712 Continued Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 143 Use the M4 x 25 mm Torx T-20 screw included with the interconnect cover to fasten it down. For more information on the FID interconnect cover, see “Baseline problems” on page 1-295. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 144 – FID capillary column 19244-80610 – – FID 1/8-inch packed column 19231-80520 – – FID 1/4-inch packed column 19231-80530 – 32. Nut warmer insulation 19234-60715 33. Nut warmer cup assembly 19234-60700 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 145 20. ECD interconnect assembly G1533-60510 12. Microcell Electron Capture 21. Micro ECD signal PCB assembly G2397-60010 Detector assembly: 22. Micro ECD interface PCB G2397-60020 – General licensed ECD, new G2397-65500 – assembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 146 29. Nut warmer cup assembly 19234-60700 30. Tubing tygon (30 inch) 0890-0934 31. Vent elbow (if present) 19303-20590 32. Tubing adapter (if present) 5020-8231 Figure 1-2. Exploded diagram of the Micro- cell Electron Capture Detector Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 147 10. Window, first heat shield 19256-80030 11. Disk, heat shield 19256-20580 12. Coupling, stainless steel 19256-20550 13. Lockwasher (4 required) 2190-0108 14. Screw, M3 × 12 (4 required) 0515-0911 15. Clamp 19256-00090 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 148 1, 1A Figure 1-3. Exploded diagram of the Flame Photometric Detector Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 149 5. Heater/Sensor assembly G1535-60620 6. Lower heater block 19256-20500 7. O-ring (Kalrez), jet cartridge 0905-1103 8. Jet cartridge G1535-80500 9. Ferrule, Vespel, 1/4-inch id (Order 0100-1061 no. 5080-8774) 10. Nut, brass, 1/4-inch 0100-0056 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 150 Figure 1-4. Exploded diagram of the jet and transfer tube assemblies Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 151 – 4. PM tube and housing assembly 19256-60510 5. Main bracket G1535-00010 6. Chimney, back G1535-00020 7. Chimney, front G1535-00030 Filters Sulfur mode (not shown) 19256-80000 Phosphorus mode (not shown) 19256-80010 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 152 Figure 1-5. Exploded diagram of the PMT and bracket assemblies Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 153 3. Electronics cover pan G1535-00120 4. Electronics top cover G1535-80540 Cover assembly (not shown) G1535-80520 5. Actuator solenoid bracket G1580-00070 – (optional) 6. Printed circuit board G1535-60010 Spring (not shown) 1460-1160 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 154 Figure 1-6. Exploded diagram of the FPD covers, modules, and electronics Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 155 4. Replacement Aux EPC module G1570-64000 O-ring, 239-inch (part no. 0905-1014 Figure 1-7. Auxiliary flow block 5181-3345, 6/pk) Aux EPC kit G1570-60500 NS Aux EPC replacement kit G1570-64000 AED/AUX EPC (G2606A) G1570-60560 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 156 Flow module Detector module assembly kits G2630-61210 G2630-61220 Screw, M4 × 12 mm (8 places) 0515-2556 Pneumatics connector covers FID module shown G2630-00680 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 157 Electronics board Detector board: FID: G1531-60010 TCD: G1532-60015 Bracket, adjust detector PCB G2630-00430 Detector A/D interface board G2630-60020 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 158 3. If installed, remove the TCD capillary adapter using a 7/16-inch wrench. 4. Open the lid to the service position. See “Raising the lid to the service position” page 1-17. Capillary adapter Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 159 11. Disconnect the detector heater/sensor cable from the harness. 6. Unscrew the top screw on the cover. 12. Remove the two T-20 Torx screws securing 7. Remove the detector electronics cover. the TCD assembly in place. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 160 5. Lift the lid to the service position. 10. If used, reinstall the capillary adapter with a 6. Reinstall the two filament wires and the PRT 7/16-inch wrench. wires on the TCD board 11. Reinstall the column. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 161 Caution Make sure you are properly grounded with an ESD strap before continuing. 2. Disconnect the electrometer ribbon cable from the µECD interface card. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 162 1/4-inch Swagelok nut on the makeup gas adapter from the bottom of the detector. Slide the makeup gas adapter out of the Heater/sensor bottom of the detector. cable Ribbon cable connector Figure 1-8. Disconnecting the µECD cables Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 163 Unscrew Swagelok nut Figure 1-9. Disconnecting the make–up gas adapter Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 164 8. Remove the one Torx T-20 screw securing the top µECD detector cover to the detector pallet and remove the cover. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 165 10. Fully loosen the four Torx T-20 screws on 11. Thread the heater/sensor leads out of the the detector pallet and lift the pallet and detector pallet and remove the detector from detector from the GC. the pallet. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 166 To reduce the risk of exposure, wear dispos- able gloves while handling the ECD micro- cell. When you are finished, dispose of the gloves and wash your hands with soap and Figure 1-11. Unlocking the thermal cover water. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 167 3. Lift the thermal cover up and carefully slide it off of the anode assembly. Heater/Sensor assembly Heater blocks Figure 1-12. Removing the heater/sensor Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 168 From there, the makeup gas sweeps past the • Approximately 6 inches of the makeup end of the column and carries the column effluent gas line resides in the oven after installa- into the µECD cell. tion. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 169 Makeup gas adapter 70-72 mm Column nut Column Microbore Coil loops around bottom Column of detector and makeup gas adapter connection Figure 1-13. Proper configuration of the column and makeup gas tubing Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 170 Detector interface card The µECD detector has an interface board off of the main board as shown below. Caution Make sure you are properly grounded with an ESD strap before continuing. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 171 Need New Detector card screw Ribbon cable µECD detector board Figure 1-14. Location of detector interface board (board installed in back detector position) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 172 2. Allow time for heated zones to cool to safe remove the bracket. temperatures. 3. Turn off all gas flows at the source. 4. Inside the oven, remove the column to the FPD. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 173 Need new Detector assembly Module assembly Valve bracket assembly Detector PCB Figure 1-15. Replacing the FPD assemblies Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 174 530 µm id may be installed up through the FPD Fused Silica Insert 9. Remove the four mounting screws in the FPD to the base of the flame as follows: bracket and remove the FPD. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 175 Slide the nut and ferrule up the column to the peak tailing.) detector base. Finger tighten the column nut until it starts to grab the column. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 176 1 mm. Use a Contamination anywhere along the light path wrench to tighten the nut an additional between flame and PMT can reduce detector 1/4 turn. sensitivity. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 177 PMT housing to avoid destroy- ing the tube. 3. Release the retaining spring around the pho- tomultiplier housing. Loosen screw Filter Loosen screws Figure 1-17. Removing the PMT filter Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 178 “Photomul- ing detector sensitivity. Replace filters as tiplier tube” on page 1-201. necessary. 0-ring Window, second heat shield 0-ring Flange adapter Clamp Flange ring O-ring, Viton New? Figure 1-18. FPD disassembly Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 179 Figure 1-19. Removing the first heatshield window 8. Note the placement and types of seals found on the disassembled parts. Seals should be replaced with new parts on reassembly. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 180 2. Allow time for heated zones to cool to safe temperatures. Caution Always turn the electrometer or the main power off before removing the PMT housing to avoid destroying the tube. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 181 6. Loosen the three screws that secure the detector to the clamp and the sheet metal. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 182 GC. Be careful not to damage the fused 7. Use two wrenches to loosen the Swagelok silica gigabore liner. connection between the jet assembly and the heated transfer tube. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 183 A new Vespel ferrule should be used to seal the detector module to the transfer line. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 184 5. Locate the ignitor cable attached to the side temperatures. of the detector. Trace the cable back to the 3. Inside the oven, remove the column to the printed circuit board and disconnect it there. FPD. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 185 U-clamp to the detec- tor frame. Remove the U-clamp and the attached parts from the bottom of the detector. U-clamp screws Figure 1-21. Replacing the transfer line fused silica liner Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 186 1/16-inch Liner Vespel ferrule by pulling the fused silica liner and ferrule out from the bottom. Inspect for Transfer tube damage. Figure 1-22. Removing the transfer tube Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 187 O-ring Heater/sensor assembly Transfer tube Heater block 3-6 mm Liner O-ring Ferrule U-clamp Figure 1-23. Replacing the fused silica gigabore liner Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 188 13. Reinstall the heated block, the heater/sensor cable assembly, the nut, and the ferrule. The notch in the bottom of the block fits over the tubing coming from the detector fitting. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 189 Pull a few inches of the cables of the housing until about 1 inch of the tube through the cable tie toward the end cap. is exposed. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 190 Always turn the electrometer or the main the cables in the clip on the side of the PMT power off before removing the PMT housing housing support. to avoid destroying the tube. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 191 6. If replacing the upper (FRONT) heater/sen- sor, remove it from the detector module. Install a new heater/sensor. If not replacing the AUX1 heater, reassemble in reverse order. Figure 1-25. Heater/Sensors Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 192 11. Reassemble in reverse order. tor. Set both in a safe place. Keep the open end of the PMT covered whenever practical to avoid light damage to the tube. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 193 Ignitor cable Spacer O-ring Glow plug Connector Ignitor cable Figure 1-26. Replacing the ignitor glow plug Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 194 8. Remove the O-ring, ignitor spacer, and glow plug from the ignitor assembly. Replace the glow plug. Inspect the O-ring and spacer, and replace if needed. 9. Reassemble in reverse order. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
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  • Page 207: Oven

    Heater duct, flap, and flap motor Oven heater shroud Oven fan motor and heater shroud Oven motor and fan Column hanger and oven fan blade Oven intake fan Injection port cooling fan CO2 cryogenic cooling kit Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 208 Replacement parts Fans Intake fan assembly G2630-61300 Front panel G2630-00270 Fan grille 3160-0249 Injection port fan assembly G2630-61320 Fan at rear of GC (not shown) G1530-60510 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 209 Heater duct, flap, and flap motor Exhaust duct G2630-80680 Flapper assembly G2630-80560 Flapper motor G1530-60945 Rear flap cable G2630-61650 Front flapper cable (not shown) G2630-61540 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 210 Oven fan motor and heater shroud Oven fan motor G2630-61310 Oven heater shroud assemblies Voltage Part no. 100 V G2630-61330 120 V G2630-61340 230 V G2630-61350 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 211 Column hanger and oven fan blade Detector electronics cover G2630-00290 Column hanger Column hanger G2630-80800 obsolete, order G2630-80800 Oven fan blade G2630-80270 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 212 5. Disconnect the mechanical front flap cable on the front of the instrument from the flap. a. Loosen the jam nut using 3/16-inch and 5/16-inch wrenches, then unscrew the cable. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 213 Remove the 7-mm top nut and remove the oven duct and flap motor assembly. Flap cable Jam nut c. Disconnect the motor power cable from the wiring harness in the back of the instrument. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 214 7. Unscrew the T-20 Torx screw on the motor collar and remove the oven flap. Note the ori- entation of the mechanical cable. Remove it using a T-10 Torx driver. Remove Motor power cable Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 215 Flap cable mounting screw Collar Flap cable Flap cable (to inside) 2. Install the flap motor onto the duct using two T-10 Torx screws. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 216 15. Reconnect the gas supplies to the 9. Feed the mechanical front flap cable through instrument. the access hole to the front of the instru- ment. 10. Plug the power cord in and turn on the power. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 217 Disconnect 1. Turn off the instrument and remove the power cord. 2. Remove the lid top cover. See “Lid top cover” on page 1-23. 6. If present, remove the LAN board. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 218 These same wires will be Oven sensor cable used to install the new oven shroud. Remove any extra insulation from the wires and save Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 219 4. Replace the insulation on the oven heater the oven. wires and the heater/sensor cable. 2. Secure the oven heater shroud using three chrome-plated T-20 Torx screws. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 220 High temperature. The oven may be very hot. heater shroud” on page 1-218. Before beginning, turn off the oven and allow it to cool. Shock hazard. Before continuing, turn off the instrument and disconnect the power cord. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 221 Fan set screw Heater shroud 7. Disconnect the oven fan motor cable from the main board (at P17). 8. Using a 7-mm nut driver, remove the ground cable. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 222 Fan motor Ground cable Fan motor 7-mm nut and washer Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 223 3. Install the fan and align the fan so that the fan blades are 5-mm from the back wall of the oven. 4. Tighten the fan set screw. 5. Install the oven heater shroud Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 224 6. Support the fan with one hand and remove the grill assembly. Note the orientation of the grill inlets—they are offset so that the grill extends down. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 225 1. Turn off the instrument and remove the power cord. 2. Remove the top cover. See “Lid top cover” page 1-23. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 226 Port on side (not visible) 4. Disconnect the fan wires at the connector. When reinstalling the fan, make sure to install the fan so that the fan exhaust port faces the inlet. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 227 Screw, M4 x 12 mm, for cryo chassis and cover Column hanger, flanged Installation sheet (this document) 1/16-inch Vespel ferrule *Column hanger, part number G2630-80800, must be ordered separately if needed. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 228 Part identification Screws Nuts Connector Vespel ferrules Restrictor tube Filter Coil bracket Cryo cover Tubing coil Cryo chassis Flanged column hanger Flange Mounting screws and washers Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 229 Hole for oven tubing 2. Remove the back panel of the GC. Follow the wires from the ventilating fan to the cable connector. Disconnect the cable and set the panel aside. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 230 1/16-inch nut and a Vespel ferrule. Insert the tube in the coolant out union as far as it will go and finger tighten the nut. Grommet Coolant in Coolant out Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 231 Install the coil bracket from the kit and secure it with the screw you just removed. Note: The bend must point up. Heater shroud Coil bracket Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 232 Tighten the1/16-inch nut finger tight. • The coil is near to, but makes minimal contact with, the heater shroud. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 233 Assemble the parts as 2. Place the slots in the chassis cover under the shown. Tighten the nut. screws, add two more screws at the top, and tighten all four. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 234 3. Raise the stop plate and tighten the screw. Close the lid. 4. Connect a supply of CO to the free end of the filter. See the next section for details. 5. Restore power. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 235 Do not use copper tubing or thin-wall stain- less steel tubing with liquid CO . Both harden at stress points and may explode. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 236 1. Connect a CGA 320 to 1/4-inch male NPT fitting to the tank followed by a Swagelok part no. SS-200-7-4 1/4-inch female NPT to 1/8-inch tube fitting. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...

  • Page 237: Electronics

    Electronics Replacement Parts Replacement Procedures Main board (G2630-60010) Main boards Main board (G2630-66015) AC boards AC board (G2630-60040) Keyboard/Display AC board (G2630-60045) Transformer Display board Transformer and AC power switch Cables Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 238 MIO jumper assembly (not shown) Main board assembly, G2630-60010 G2630-60050 Replace with G2630-66020 (Main PCA and LAN Assembly Replacement Kit) if the GC serial number is between US00000000 and US00003200 MIO LAN card (not shown) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 239 Main board (G2630-66015) Fuse, 5A glass body, IEC Type F, nontime delay 2110–0709 LAN Assembly Replacement Kit (not shown) Main board assembly, G2630-66015 G2630-66900 Replace with G2630-66015 (Main PCA Replacement Kit) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 240 100 V (± 10%) 48-66 1440 W 15 amp receptacle G2630-60740 120 V (± 10%) 48-66 1440 W 15 amp receptacle G2630-60830 230 V (± 10%) 48-66 2000 W 7.5 amp receptacle G2630-60840 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 241 High-power AC board for high-speed oven option Fuse, 20A, ceramic body, IEC Type F, non-time delay 2110-0098 Fuse, 6A, glass body, IEC Type F, non-time delay 2110-0056 AC board assembly G2630-60045 AC Board Mounting Plate G2670-00240 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 242 Display board Display board assembly G2630-60580 Front housing G2630-60530 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 243 Transformer and AC power switch Transformer G2630-60970 Transformer, viewed from back of GC AC switch assembly G2630-60820 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 244 PTV cryo valve Converter board AUX EPC extension cable G2630-60795 AUX EPC Main board Line connector cable assembly G2630-61005 AC board Line filter Cooling fan cable G2630-60990 Main board Cooling fans Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 245 2. If a LAN card is installed, loosen the mount- ing screws and remove the card. Shock hazard. Before beginning, turn off the instrument and disconnect the power cord. 3. Disconnect all cables from the main board. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 246 LAN bracket to main board Nuts holding main board and LAN bracket to GC 5. Open the lid.Lift the main board and bracket assembly and slide it out of the chassis. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 247 1. Use a Control Module to change the GC serial number. See “Change GC serial number” page 1-263. 2. Use a Control Module to check/change the oven type configuration. See “Change oven type” on page 1-263. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 248 -24 V +24 V +15 V -15 V +5 V G2630-60010 G2630-66015 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 249 1-16. Caution Use electrostatic discharge precautions Figure 1-1. AC board while replacing the main board. 2. Disconnect the power switch cable (P8). See Figure 1-2, “AC board connectors” for more information. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 250 4. Disconnect the two oven heater spade lugs (P3 and P4). See Figure 1-2, “AC board con- nectors” for more information. 5. Remove the flap/AC cable (P10). 6. Loosen the farthest nut on the AC board bracket. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 251 Oven heater spade lugs Remove this nut (P3 & P4) Loosen this nut Flap/AC cable (P10) Voltage configuration plug (P12) Transformer cable (P9) Power switch cable (P8) Figure 1-2. AC board connectors Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 252 1. Compare the voltage configuration plugs on the old and new boards (connector P12). If necessary, transfer the old configuration jumper onto the new board. See Table 1-2 Table 1-3. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 253 Install the top nut on the AC board bracket onto its threaded stud. 4. Tighten the remaining nut on the AC board bracket. 5. Connect the cables and the oven heater spade lugs. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 254 1. Turn off the instrument and remove the power cord. 2. Remove the front cover and keyboard/dis- play. See “Front cover (with keyboard and display)” on page 1-20. Caution Use electrostatic discharge precautions while replacing the main board. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 255 You are working near printed circuit boards. Transformer (included in this G2630-60970 G2630-61570 kit) Follow standard ESD precautions. Transformer mounting pad (sup- G2630-21020 plied with G2630-60970 trans- former) Replacement guide G2630-90347 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 256 AC board, and long cable to P8 on the Main Figure 1-4. Replacement mounting pad board) followed by removing the two existing (G2630-21020) installed M10 nuts and cone washer securing the transformer onto the M10 screw. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 257 1-5. cone washer (1460-2403) with its cone side up, then followed by one M10 nut (0535- 0189). Tighten the nut firmly using the 17-mm socket such that the transformer cannot rotate. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 258 Remember to reconnect the back panel cooling fan. This completes replacement of the transformer and mounting pad. Restore power to the unit and verify its normal operation. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...

  • Page 259: G2629A Control Module

    G2629A Control Module Procedures A typical SERVICE method Update firmware Change GC serial number Change oven type Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 260 • All gas flows that will be disconnected are turned OFF 2. Select GC Update, Injector Update, or Mod • Any other feature that could be hazardous or Update. waste resources (such as cryo cooling) is turned off Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 261 Module must contain firmware revision firmware. A.03.00 or higher. 5. For GC firmware updates, restore the meth- ods and local LAN addressing information (if used). Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 262 By default, a new main board is set to use the 2. Select Edit GC Serial No. oven as a 120V configuration. For 200–240 V configurations, change the oven type using the Control Module as follows. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 263 (?), then enter “. . .” (three dots) as the password. Once this is done, the set- tings options are enabled. 4. Select the correct oven type, then press OK. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...

  • Page 264: Manuals And Other Parts

    Table 1-1. Shipping Kit and documentation Description Part no. Shipping package for GC G2630-60540 6850 Series User Information CD-ROM G2630-90329 6850 Series Service Training CD-ROM 5968-4121E 6850 Series Service Information G2630-90648 CD-ROM Released: April 2004 6850 Series Gas Chromatograph Service Procedures...

  • Page 265: Troubleshooting

    Inlets Detectors Split/Splitless inlet Flame ionization detector Purged packed inlet Thermal conductivity detector Programmable temperature Flame photometric detector vaporization inlet Microcell electron capture detector Cool on-column inlet Other Electronic failures Valves Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 266 2. The EPC control module is functioning pressure, as required by short 530 µM or other properly. wide bore capillary columns in split mode. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 267 "Cartridge Trap" installed in the flow path. This includes: split vent line and it is not plugged. a. The interface between the bottom surface of the glass inlet liner and the gold seal Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 268 NOTE: This pressure will be significantly higher help to determine if there is abnormal split vent using nitrogen carrier instead of helium! flow path restriction (see the 6850 Series Control Module user information for more Typical example of the problem details).
  • Page 269 Split ratio of 135:1 results in a split vent flow of 396 mL/min and a total inlet flow of about 400 mL/min (column + septum purge + split vent flows) Optimum linear Inlet pressure required for velocity optimum liner velocity Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 270 Proportional Split valve 1 vent Split vent trap Purge valve open Proportional Reduced flow valve 2 Full flow - split flow path Old style split vent trap Column flow Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 271 1.5 psi. The inlet pressure cannot go down because of restric- tion in the split vent flow path. There are five possible sources of this restriction: Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 272 6850 GC. One is for split, the other for splitless analysis. There are very specific design differences in the two glass liners to make them optimum for their respective operating modes. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 273 Glass bead at the base to provide optimum sample components clearance for split flow with minimal restriction. Larger outside diameter to limit sample Smaller outside diameter than splitless exposure to injection port body during liners. the splitless delay. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 274 G1544-60610. Standard High split flow gold seal gold seal 18740-20885 5182-9652 4. If not using a recommended Agilent glass split injection port liner, there is an optional Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 275 The purpose of this section is to outline a logical number 5183-4647) or if the inlet is being used procedure for troubleshooting a 6850 series GC in splitless mode. After any system modifica- that will not equilibrate to the setpoint pressure tions, always perform the inlet leak test per the of the capillary inlet system.
  • Page 276 Split vent control loop 50 mL/min Proportional valve 1 Split vent trap Purge valve Gold seal open Proportional Reduced flow valve 2 Full flow - split flow path Column flow: 2 mL/min Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 277 3. The inlet pressure control appears to be 2. The carrier gas supply module is free of leaks functional, however due to chromatographic and restrictions to gas flow. symptoms or reproducibility problems a small inlet leak is suspected. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 278 4. The glass liner and liner O-ring are installed Column ferrule correctly and the liner is not cracked. The insert weldment is tightened. 6. Confirm that the column ferrule is installed correctly. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 279 If the screw is too long, the fitting will not seal. O-rings Split vent trap cartridge Exploded split vent trap cartridge Split vent tubing Gang fitting Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 280 Case 2: Actual inlet pressure increases • Confirm that the actual inlet pressure is slowly and does not reach the setpoint still lagging the setpoint NOTE: Check all of the parameters from Case 1 before proceeding. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 281 Septum cally dysfunctional 3. Remove the insert weldment from the injec- tion port body (large nut on the upper weld- ment assembly). 4. Set the inlet pressure to 0 psi. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 282 • Leak at the gang fitting of the EPC module • Cracked stainless steel tube on the insert • Insufficient supply pressure/flow volume to weldment the inlet EPC module • Septum may have a hole in it Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 283 EPC module, although this is very unlikely. EPC gang fitting See the test at the end of this section that uses the 6850 Leak Test Kit to isolate leaks internal to the EPC module. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 284 The inlet pressure will be a function of the but is a good first pass or remote diagnostic to column dimensions and oven temp. This see if complete inlet pressure testing is needed. example shows 20 psi. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 285 Proportional Split vent valve 1 50 mL/min Split vent trap Purge valve Gold seal open Proportional Reduced flow valve 2 Full flow - split flow path Column flow: 2 mL/min Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 286 Proportional Split vent valve 1 0 mL/min Split vent trap Purge valve Gold seal closed Proportional Reduced flow valve 2 Full flow - split flow path Column flow: 2 mL/min Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 287 If there are leaks in the inlet, the total flow will be greater than expected. Since the flow sensor is a readout device only in splitless prep run, it will measure any flow that escapes the inlet via a leak. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 288 Split vent valve 1 0 mL/min Split vent trap Purge valve closed Proportional Reduced flow valve 2 7 mL/min Gold seal leak Full flow - split flow path Column flow: 2 mL/min Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 289 It should drop < 0.5 psi for every 10 minutes. • Short piece of column installed in the inlet with a new septum inserted edge- wise over the end of the column. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 290 EPC module for the that facilitates leak testing of only the EPC inlet under evaluation. module. This fitting is available in the Leak Test Kit (part number G1530-60960). Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 291 Purged packed inlet Figure 1-1. EPC module serviceable parts Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 292 Programmable temperature vaporization inlet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 293 Cool on-column inlet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 294 99.9995% or greater. Also the FID temperature should be maintained at least 20°C greater than the final oven temp of the GC analysis. The FID should never be oper- ated at less than 300°C. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 295 The gas delivery module must factors, including: be leak free. 1. Contamination in the gas supplies to the GC. Normally if there is gas contamination, the background will also be abnormally high (> 20 pA). Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 296 NOTE: If the FID baseline has a periodic cycling component, it could be due to poor regulation and filtering of a house air compressor system, a defective tank regulator or a faulty detector EPC module. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 297 One of the two detector electronic assemblies (the electrometer or the FID electronics board) could be noisy If the leakage current test passes, proceed with the next test. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 298 If the problem persists, con- tinue the procedure. Otherwise reevaluate with a known good, thin, well-conditioned, film column (an uncoated retention gap is a good troubleshooting tool to isolate column bleed problems). Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 299 Temperature and Pressure. For accurate readings, use a true mass flow measurement device (such as the Agilent Flow Tracker 1000). Resolve any flow control problems and retest the FID noise. Sealing surface Partially plugged jet Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 300 Air supplies or try alternate sources for collector. and Air. • Plug the FID column fitting to continue with the troubleshooting procedure. 7. Relight the flame and bakeout the detector at 350°C for an hour. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 301 The default Lit Offset value is 2.0 pA. The purpose of this section is to outline a logical procedure for troubleshooting FID ignition prob- lems, including lighting the FID, flameouts during injection, and intermittent re-ignition during a run. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 302 20°C > the final oven temp of the GC analysis. The FID should never be operated at less than 300°C. This temperature will not damage columns with a maximum temperature lower than 300°C. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 303 Carrier/Makeup: 80 to 100 psi (150 psi assembly. If the igniter coil is open cir- for high pressure inlet) cuit or contaminated with corrosive Air: 80 psi minimum material it must be replaced. : 60 psi minimum Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 304 1 atm). For accurate measurements use a against a known restriction built into the true mass flow meter like the Agilent Flow EPC module. Tracker 1000. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 305 Since these flows are pressure controlled, a restricted jet will reduce the H and makeup flows are pressure controlled, a restricted jet will reduce the H and makeup flows Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 306 Air flow and measure the actual disconnect the column and cap the FID flow rate. column fitting. Table 1-1 lists reasons and solutions for low FID flow rates. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 307 H makeup flow. Sealing surface If there is an imperfection in the seal, H will leak around the jet rather than going through. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 308 TCD filament at a 5 Hz rate. Due to the 5 Hz mechanical/pneumatic switching, the most narrow, gaussian peak that the TCD can be used to quantitate accurately and repro- ducibly is 0.02 minutes. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 309 NOTE: TCD noise should never be evaluated at a ChemStation data rate > 10 Hz. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 310 Example chromatogram Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 311 20 Hz data rate Areas: 85.3 84.2 82.9 10 Hz data rate Areas: 85.8 84.9 83.6 5 Hz data rate Areas: 86.3 85.5 84.1 These chromatograms were produced on TCD/PPIP - standard checkout sample Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 312 20 Hz data rate 10 Hz data rate 5 Hz data rate Comparison of peak shapes Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 313 Comparison of ringing on peak tails Tail of C14 at 20 Hz Tail of C14 at 10 Hz Tail of C14 at 5 Hz Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 314 Comparison of TCD noise acquired at 20, 10, and 5 Hz The specification for TCD noise is < .057 display units (25µV) Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 315 A careful, multilevel calibration is well worth the invest- ment! Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 316 25°C above the GC main circuit board. If the glow plug has failed, final oven temperature—if allowed by the temper- replace it. ature limit of 250°C. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 317 If not, there is insufficient supply pressure. 2. Check the Lit offset value. If it is zero, autoignition is turned off. If it is too large, the software will not recognize that Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 318 Thoroughly leak check the whole system. 6. The sulfur mode can be particularly hard to light. Try changing to the phosphorus mode flows, lighting the flame, and gradually alter the flows to the sulfur values. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 319 Microcell electron capture detector Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 320 • The +5 VDC power supply is operational and dead GC is no front panel display characters. in specification. This supply is on the main board. • Appropriate firmware is installed properly on the GC main board. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 321 Figure 1-2. Standard (Original) vs. connectors or printed circuit board assemblies. networked GC back panels Observe electrostatic discharge precautions while removing or re-installing printed circuit board assemblies. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 322 Power distribution Use the following figures as a guide to trouble- shooting: AC board fuses (see AC Board Assembly) Figure 1-3. Power distribution Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 323 -24 V +24 V +15 V -15 V +5 V G2630-60010 G2630-66015 Figure 1-4. Main Board Connectors, Test Points, and Fuses Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 324 +24 VDC Inlet/Oven intake cooling fans +24 VDC Oven interlock/Oven flap motor/AC Board oven relay/Oven +5 VDC, +24 VDC pulse transformer Front panel UI - Display and keypad +5 VDC, +24 VDC Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 325 • Be careful when removing the wires from the oven interlock switch as they break easily. Also, be sure to prevent them from touching ground while trou- bleshooting the GC. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 326 3. Use the following flow chart to determine the root cause of the problem: Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 327 Could be due to cut insulation or Blown fuses wire smashed under a screw (usually after a repair). The following is a list of possible causes for blown fuses. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 328 • Internal valve drive blown. If so, replace the main board. • All EPC modules See the flow chart on page 1-327 for trou- bleshooting blown F1/F2 fuses. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 329 Fuse 6A, glass body, IEC Type F nontime delay 2110-0056 Voltage configuration plugs Voltage configuration Part number 1. 100 V ± 10% G2630-60740 2. 120 V ± 10% G2630-60830 3. 230 V ± 10% G2630-60840 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 330 Fuse 6A, glass body, IEC Type F nontime delay 2110-0056 Voltage configuration plugs Voltage configuration Part number 1. 100 V ± 10% G2630-60740 2. 120 V ± 10% G2630-60830 3. 230 V ± 10% G2630-60840 Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 331 A plumbing diagram is essential for effective troubleshoot- ing. The following “symptom-cause” list gives the most commonly encountered problems found with valves and their solution. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 332 Peak tailing broad peaks Column overload Use smaller sample loop Increase split flow Flow too slow Increase column flow Increase split flow System voids Check connections Reduce volume of connecting tubing Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 333 • Failure or deterioration of other components (columns, detectors, etc.). • Check for blocked flow paths with valve in both positions. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 334 Other causes, totally unrelated to the valve, may liners, and narrow-bore connecting tubing should produce similar symptoms. Impure carrier gas be used between the valve and inlet. (that is, containing water) can cause extraneous peaks. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 335 TCD filaments. An adjustable switched. restrictor (needle valve) can also be used where a matched restriction is desired but not for preventing pressure or flow surges. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 336 Since this method does not necessarily loop pressure, and valve boxes help maintain isolate the leak, other leak check methods may temperature. be needed to locate the leak specifically. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...
  • Page 337 30 to 60 seconds, then stabi- lize. After this initial pressure drop, the gauge should not indicate more than a 7 to 14 kPa (1 to 2 psi) drop during a 10 minute period. Released: April 2004 6850 Series Gas Chromatograph Service Procedures...