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Dionex CD25 Operator's Manual

Conductivity detector
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CD25 CONDUCTIVITY DETECTOR
OPERATOR'S MANUAL
© 2000 Dionex Corporation
Document No. 031687
Revision 01
April 2000

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  • Page 1 CD25 CONDUCTIVITY DETECTOR OPERATOR'S MANUAL © 2000 Dionex Corporation Document No. 031687 Revision 01 April 2000...
  • Page 2 Dionex Corporation, 1228 Titan Way, Sunnyvale, California 94088-3603 U.S.A.

  • Page 3: Table Of Contents

    Contents 1 • Introduction Overview ..........1-1 About This Manual .
  • Page 4 CD25 Conductivity Detector 2.5.2 Local and Remote Modes ......2-17 2.5.3 Method Control ........2-17 3 •...
  • Page 5 Contents Faulty DX-LAN Communication ......4-7 Diagnostics ..........4-8 5 •...
  • Page 6 CD25 Conductivity Detector B.2.1 Power Connection ........B-1 B.2.2...
  • Page 7 Contents C.2.6 Keyboard Test ........C-16 C.2.7 Diagnostic Tests .
  • Page 8 CD25 Conductivity Detector Doc. 031687-01 4/2000...

  • Page 9: Introduction

    The CD25 can be controlled locally, from the front panel, or remotely (via the Dionex DX-LAN™ interface) from a host computer running PeakNet 6, Release 6.1 (or later) software.

  • Page 10: About This Manual

    Explains the detector operating modes. Chapter 3 Describes operating features and how to create, edit, and Operation and run methods from the CD25 front panel. Lists routine Maintenance preventive maintenance requirements. Chapter 4 Lists possible causes of problems and step-by-step Troubleshooting procedures to isolate and eliminate them.

  • Page 11: Typefaces

    1.2.2 Safety Messages and Notes This manual contains warnings and precautionary statements that can prevent personal injury and/or damage to the CD25 when properly followed. Safety messages appear in bold type and are accompanied by icons, as shown below. Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

  • Page 12: Safety Labels

    Safety Labels The CE and GS safety label on the CD25 attests to compliance with the following European, EMC, and safety requirements: Council Directives 73/23/EEC and 89/ 336/EEC, EN 61010-1:1993 (safety), EN 50082-1:1992 (susceptibility), and EN 55011:1991 (emissions).

  • Page 13: Description

    2 • Description Front Control Panel The control panel on the front door of the CD25 contains the liquid crystal display (LCD), the membrane keypad, and the actuator for the main power switch. The electronics chassis, described in Section 2.1.3, is located behind the front door.

  • Page 14: Control Panel Keypad

    2.1.2 Control Panel Keypad The buttons on the front panel keypad are used to affect screen functions, to directly control CD25 operation, and to create and modify programmed series of timed events, called methods. For example, pressing Hold/Run turns the method clock off...
  • Page 15 2 • Description Select ∆ Select ∇ buttons to enter variable values or the buttons to choose predetermined values. In most cases, confirm the selected value, by pressing either a cursor arrow button or Enter . In certain fields and/or screens, however, you must press Enter to confirm the selected value.
  • Page 16 CD25 Conductivity Detector Keypad Function Buttons Delete Removes the value from the current entry field. To restore the previous value, move the cursor from the field before entering a new value. Pressing Delete when the cursor is in a step entry field on the screen “blanks”...
  • Page 17 2 • Description Keypad Function Buttons The four cursor buttons move the cursor, in the direction of the arrow, to the next entry field. If there is no changeable field in that direction, the cursor moves diagonally or remains in its current location. In most cases, after entering a new value in an entry field, pressing an arrow button saves and/or executes the change.

  • Page 18: Initial Display Screens

    CD25 Conductivity Detector 2.1.3 Initial Display Screens When the CD25 has successfully powered-up and passed all diagnostic tests, the screen (see Figure 2-2) displays briefly, followed by POWER-UP screen (see Figure 2-3). If one of the diagnostic tests fails at...
  • Page 19 2 • Description To access other screens, press the button on the front panel to Menu display the (see Figure 2-4). To select an option, move MENU of SCREENS the cursor to a screen name and press , or enter the screen number Enter on the keypad and press .

  • Page 20: Electronics Chassis

    CD25 Conductivity Detector Electronics Chassis The electronics chassis is located immediately behind the front door of the CD25. The chassis contains several electronics cards (printed circuit boards) that are used to control the CD25. Various connectors on the cards allow communication between the CD25 and other system modules and accessories.

  • Page 21: Connectors

    Appendix D for a description of relay and TTL functions and the connections between the CD25 and other modules. 60-pin Ribbon Connector (Slot 5) The 60-pin ribbon cable to the CD25 front panel (display and keypad) connects here. 2.2.2 Cards Power Supply Card Provides 45 watts of power for the detector electronics.
  • Page 22 C is reached, proportional heat control maintains a constant temperature. SP (Signal Processor) Card Contains all the analog circuitry needed by the CD25, as well as the digital circuitry required to interface to the CPU. See Appendix E for a list of SP card functions.
  • Page 23 A green LED indicates normal operation. A red LED indicates a fault condition. When a fault occurs, the CD25 enters its diagnostic state and no other control is permitted until the problem is corrected. Turning off the power for a few seconds may clear the fault;...

  • Page 24: Conductivity Cell

    CD25 Conductivity Detector Conductivity Cell The flow-through conductivity cell has an active volume of about 1.0 µL. Two 316 stainless steel electrodes are permanently sealed into the PEEK cell body. The cell constant has a nominal value of 160 cm and is calibrated electronically.

  • Page 25: Ds3 Detection Stabilizer

    C to 45 C. A sensor near the heat exchanger outlet senses the eluent temperature. The CD25 circuitry compares this temperature with the user-selected temperature and adjusts the heat input in real time to hold the temperature within a few millidegrees.

  • Page 26: Shielded Cell

    CD25 Conductivity Detector D S3 To Detector Inlet E lectronics D S3 O utlet D S3 C onductivity C ell E nclosure K eyhole M ounting S lots G round W ire S pill/O verflow C ell Inlet Line Figure 2-6. DS3 Detection Stabilizer 2.3.2...

  • Page 27: Rear Panel

    DX-LAN interface. DX-LAN Connection (Optional) When you order the DX-LAN network, a DX-LAN connector is factory-installed in the upper left corner of the CD25 rear panel (see Figure B-1). See Appendix B for DX-LAN interface connection instructions. External Connection Access...

  • Page 28: Functional Description

    In Direct control, the CD25 executes commands immediately. In Method control, the CD25 executes commands according to the timed steps in a method. The method is programmed from the CD25 front panel. The table below summarizes the various operating and control mode configurations.

  • Page 29: Local And Remote Modes

    Local and Remote Modes Local Mode When the CD25 is powered up, it is always in Local mode. In Local mode the detector accepts operating commands from two sources: Direct input from the front panel keypad and screens. All operating functions are available with direct input.
  • Page 30 Only those parameter changes which affect the method after the current time will be implemented in the current run. The CD25 can store up to 100 separate methods (0 through 99) in memory. The actual number, which depends on the size of each method and the amount of available memory, is typically less than this.

  • Page 31: Operation And Maintenance

    Verify that all cables are correctly connected to the CD25. Verify that the CD25 power cord is plugged into the main power. Press the power switch actuator on the CD25 front panel (see Figure 2-1) to turn on the power. The...

  • Page 32: Running Under Direct Control (Local Mode)

    As soon as the proper current is determined and eluent is flowing through the Self-Regenerating Suppressor (SRS) at the correct rate, turn on the SRS. (The SRS power is always off when the CD25 is powered up.) After start-up, the usual direction of drift is downward as SRS efficiency improves.

  • Page 33: Running Under Method Control (Local Mode)

    3 • Operation and Maintenance Running Under Method Control (Local Mode) In the Method control operating mode, the CD25 is controlled by a series of programmed timed events, known as a method. Methods are retained in memory even after the detector power is turned off.

  • Page 34: Creating A New Method

    CD25 Conductivity Detector 3.3.3 Creating a New Method 1. Go to the screen. In the field, enter an unused method METHOD EDIT number from 0 through 99 and press or a cursor arrow button. Enter This displays a blank method on the screen.

  • Page 35: Editing An Existing Method

    Changing Method Parameters Move the cursor to the desired field and enter a new value, using the CD25 front panel buttons. Press Enter or a cursor arrow button after each editing change.
  • Page 36 CD25 Conductivity Detector Deleting a Method Step Move the cursor on the screen to the time of the step to be METHOD deleted and press twice. Delete Deleting an Entire Method Move the cursor on the screen to the field and press...

  • Page 37: Optimizing Temperature Compensation

    3 • Operation and Maintenance Optimizing Temperature Compensation The CD25 built-in temperature compensation stabilizes conductivity readings by correcting for changes in ambient temperature that occur during a run. For more information about temperature control and compensation, see Section 2.3. 3.4.1 With a DS3 and Conductivity Cell If the ambient temperature exceeds 45 °C, the DS3 may be...

  • Page 38: With A Shielded Conductivity Cell

    This section describes routine maintenance procedures that can be performed by the user. Any other maintenance procedures must be performed by qualified Dionex personnel. NOTE The CD25 electronic components are not customer- serviceable. Repair of electronic components must be performed by Dionex.

  • Page 39: Troubleshooting

    Appendix C for instructions on running the CD25 diagnostics program. If you are unable to eliminate a problem, contact Dionex. In the U.S., call 1-800- 346-6390 and select the Technical Support option. Outside the U.S., call the nearest Dionex office.

  • Page 40: Low Detector Output

    Recalibrate the cell (see Section 5.4). High Detector Output Auto offset not activated recently Press on the CD25 front panel before making an injection. Offset Background not suppressed by SRS Check the SRS regenerant out line for bubbles; if there are no bubbles, the suppressor may be contaminated.
  • Page 41 4 • Troubleshooting Insufficient system equilibration following any changes to operating parameters; especially apparent when operating at high sensitivities Allow longer system equilibration before beginning operation. Air trapped in cell; excessive regular pulses in baseline Remove the trapped air (see Section 5.2). To prevent air from becoming trapped in the cell in the future, increase backpressure on the cell by reducing the inner diameter of the tubing installed after the cell and before the SRS.

  • Page 42: Liquid Leaks From The Ds3

    Follow the steps below to disassemble the DS3 and inspect it for the source of the leak. Test and dry the DS3 before reassembly. 1. Turn off the CD25 power. 2. Disconnect the DS3 cables. 3. Disconnect the DS3 inlet and outlet lines. Do not misplace the ferrule fittings at the end of the tubing (see Figure 4-1).
  • Page 43 4 • Troubleshooting folding. Check that the top and bottom inserts meet on all sides before latching the cover. Insulating Foam Outlet Inlet Insert Bottom Cover Alum inum Cables Phillips Screws (4) Cover Spill O verflow Line Figure 4-1. DS3 Exploded View Outlet Inlet Cell...

  • Page 44: Ds3 Temperature Inaccurate

    Remove the cover and inspect the DS3 for broken or shorted wires or for moisture bridging the control thermistor. If a wire is broken or shorted, replace the wire or call Dionex for assistance. If a leak has caused a short, fix the leak and dry the control sensor.

  • Page 45: Conductivity Inaccurate

    The cause is internal leaks, broken or shorted cell or sensor wires. Check the sensor by comparing the cell temperature readout with the actual DS3 temperature. If necessary, return the cell to Dionex for repair. Do not disassemble the cell; this will break the seal and void your warranty.

  • Page 46: Diagnostics

    Before running a diagnostic test, use the troubleshooting information in earlier sections of Chapter 4 to isolate problems that are unrelated to the CD25 electronics. The CD25 Moduleware includes several diagnostic tests of the electronics. To access these, select the from the . The...

  • Page 47: Service

    Before replacing any parts, refer to the troubleshooting information in Chapter 4 to isolate the cause of the problem. To contact Dionex in the U.S., call 1-800-346- 6390 and select the Technical Support option. Outside the U.S., call the nearest Dionex office.

  • Page 48: Eliminating Liquid Leaks

    CD25 Conductivity Detector Eliminating Liquid Leaks The PEEK version of the CD25 is plumbed with 1.60-mm (1/16-in) OD PEEK tubing, Dionex ferrule fittings (P/N 043276), and 10-32 fitting bolts (P/N 043275). For tightening requirements, refer to Installation of Dionex Ferrule Fittings.
  • Page 49 Before latching the cover, make sure the top and bottom inserts meet on all sides. 12. Reconnect the DS3 cables and turn on the CD25 power. Calibrate the cell constant (see Section 5.4). Outlet...

  • Page 50: Calibrating The Cell

    Enter a new value, regardless of the composition of the solution in the cell. Calibrate the cell at 147.00 µS/cm. This automatically enters a new value for the cell calibration constant into CD25 memory. To calibrate the cell, follow the steps below.
  • Page 51 5 • Service 10. Reconnect the pump to the chromatography module. 11. Reconnect the liquid line from the suppressor outlet to the cell inlet. 12. Reset to the optimal value for the eluent. TEMP COMP 13. Set the pump to a flow rate that is safe for the system in use. Doc.

  • Page 52: Replacing The Main Power Fuses

    CD25 Conductivity Detector Replacing the Main Power Fuses The fuse holder is in the main power receptacle on the CD25 rear panel. 1. Turn off the main power. HIGH VOLTAGE—Disconnect the main power cord from its source and also from the rear panel of the CD25.

  • Page 53: A • Specifications

    5 to 95% relative humidity, non-condensing Humidity A.2 Electrical Main Power 85 to 270 Vac, 47/63 Hz; 40 W Max, 25 W typical. The CD25 power supply is auto-sensing and requires no voltage adjustment. Fuses Two 3.15 amp fast-blow IEC127 fuses (P/N 954745)

  • Page 54: Display And Keypad

    Control of four functions via TTL or Relay contacts Operation DX-LAN All functions can be controlled by PeakNet software on a PC Operation connected to the CD25 via the DX-LAN interface (Optional) A.5 Conductivity Cell Cell Body PEEK 1.0 µL...

  • Page 55: Srs Power Supply

    A • Specifications A.6 SRS Power Supply Supply Current 50, 100, 300, 500 mA at 1.5 to 7.5 V Over-Voltage 8.5 V Alarm Over- 40 ºC (104 ºF) Temperature Alarm A.7 DS3 Detection Stabilizer (Optional) Operating 25 ºC to 40 ºC (50 ºF to 104 ºF) Temperature Warm-up Time 10 minutes (typical)
  • Page 56 CD25 Conductivity Detector Doc. 031687-01 04/2000...

  • Page 57: B • Installation

    IEC jumper power cord (P/N 960748) provided in the LC30 Ship Kit from the main power receptacle on the CD25 rear panel to one of the four IEC auxiliary receptacles on the rear panel of the LC30. Leave the CD25 power switch on continuously and use the LC30 main power switch to Doc.
  • Page 58 CD25 Conductivity Detector turn the CD25 on and off. Other modules in the system can be connected to the LC30 in the same way, allowing the LC30 to function as the main power source for the system. SHOCK HAZARD—To avoid electrical shock, a grounded receptacle must be used.

  • Page 59: Dx-Lan Interface: 10Base-T Connections (Optional

    Standard anti-static procedures must be observed when installing the interface card or handling the CPU card. To prevent damage to the CD25, turn off the main power before installing the detector interface card. After confirming that the LED on the CPU card is off (not green or red), unplug the power.
  • Page 60 Failure to use the correct cable will cause the detector to lose communication with the host computer. 3. Connect the other end of the cable into the 10BASE-T DX-LAN connector on the CD25 rear panel (see Figure B-1). Doc. 031687-01 04/2000...
  • Page 61 LAN card. If the connection is via port 8 on the hub, set the Normal/Uplink push button to Normal. NOTE Installation instructions for the host computer’s internal DX-LAN card are in Installing the Dionex PeakNet 6 System (Document No. 031631). When using 10BASE-T cabling, you must use a hub. If you simply plug the 10BASE-T cable from the detector into the connector on the host computer’s DX-LAN card, the...

  • Page 62: Dx-Lan Interface: Bnc Connections (Optional

    (P/N 046341) and a coaxial DX-LAN cable (P/N 960405) must be connected to the BNC tee connector (P/N 921914) on the rear panel. From the CD25, connect the DX-LAN cable to one of the following: Another instrument equipped with a BNC connector, or A “combo”...
  • Page 63 B • Installation 2. Remove any TTL/Relay plugs from the connectors at slot 4 of the electronics chassis (see Figure 2-5). 3. Disconnect the 60-pin ribbon cable from the inside of the front panel by opening the ejector latches on the connector. 4.
  • Page 64 BNC connector will cause the CD25 to lose communication with the host computer. 3. If the CD25 is the last module in the network to be connected, install a terminator resistor plug (P/N 921034) on the remaining port of the BNC tee connector.

  • Page 65: Ds3 Detection Stabilizer Installation

    B • Installation B.2.4 DS3 Detection Stabilizer Installation Install the DS3 with the conductivity cell (P/N 044130) in a chromatography module—for example, an LC20 Chromatography Enclosure—or on a laboratory workbench. The instructions for installing the DS3 vary somewhat, depending on the type of enclosure. See Section B.2.6 for installation and plumbing instructions.
  • Page 66 CD25 Conductivity Detector The CD25 Ship Kit includes certain items required when installing the SRS: SRS gas separator waste tube (P/N 045460) Backpressure coil for 4 mm SRS (P/N 045877) SRS-to-CD25/ED50 control cable (P/N 046346) NOTE The instructions here do not replace the instructions in your SRS manual.
  • Page 67 B • Installation For backpressure requirements for the Nonsuppressed mode, see the following table. The minimum backpressure should be 0.21 to 0.34 MPa (30 to 50 psi) per minute. Flow Rate (mL/min) Tubing ID Coil Length Number of Coils 0.5 to 1.5 0.25-cm 0.76 M (0.010-in)
  • Page 68 CD25 Conductivity Detector Injection V a l v e 1 /4 - 2 8 1 /4 - 2 8 G u a r d C o l u m n Separator Waste W as te T u b e A n a l y t i c a l C o l u m n 2 mm ID, 10-32, 0.005"...
  • Page 69 B • Installation In jectio n Valv e 1/4 -28 1/4-28 G uard W aste C o lum n G a s S e p a ra to r 1/4-28 W a ste W a ste T u b e 10-32 C o il A nalytical C o lum n...
  • Page 70 CD25 Conductivity Detector Analytical Column Backpressure Coils 2 m m ID , 10 -32 , 0.0 0 5" ID P E E K L iq u id L in e 4 m m ID , 1 0 -32 , 0 .0 10 " ID P E E K L iq uid L in e 4 m m ID , 1 /4-2 8, 0 .0 1 2 "...
  • Page 71 B • Installation DS3 Detection Stabilizer (or Shielded Conductivity Cell) Alternate DS3 or Shielded Conductivity Cell Location F R O N T Figure B-5. Typical DS3 Installation in LC20 or LC30 B-15 Doc. 031687-01 04/2000...
  • Page 72 3. Plug the connectors on the cables into the appropriate jacks on the SCR card. (To identify the card location and connector positions, see the label on the inside of the CD25 front door or to Figure 2-5 in this manual.) 4.

  • Page 73: Recorder/Diagnostic Connection

    4. Plug the connectors into the appropriate jacks on the SCR card. (To identify the card location and connector positions, see the label on the inside of the CD25 front door or to Figure 2-5 in this manual.) 5. Connect the eluent outlet of the column or suppressor to the DS3 or cell inlet, using 0.25-mm (0.010-in) ID PEEK tubing (P/N 042690),...

  • Page 74: Automatic Srs Power Control (Optional

    5. Plug one end of the cable into TTL2 OUT on the pump (see Figure B-6). 6. Route the cable through the upper chase of the pump and the CD25, and then plug the free end of the cable into TTL3 IN on the CD25.
  • Page 75 B • Installation Figure B-6. TTL Connections for SRS Power Control B-19 Doc. 031687-01 04/2000...
  • Page 76 CD25 Conductivity Detector B-20 Doc. 031687-01 04/2000...

  • Page 77: C • User Interface

    C • User Interface This appendix illustrates and describes all of the screens available for display on the front panel of the CD25 Conductivity Detector. There are two categories of screens: operational and diagnostic. Operational screens enable you to create, edit, and run methods that control CD25 operation, and to select default parameters for the detector.

  • Page 78: Operational Screens

    CD25 Conductivity Detector C.1 Operational Screens C.1.1 Menu of Screens provides top-level access to the menu structure. MENU of SCREENS M E N U of S C R EE N S M O D U LE SETU P M A IN S C R EE N...

  • Page 79: Main Screen

    The Locked Remote mode can be canceled only by a Disconnect command from PeakNet 6 or by turning off the CD25 and then turning it back on. Note: PeakNet 6 does not use the regular (unlocked) Remote mode.

  • Page 80: C.1.3 Detail Screen

    CD25 Conductivity Detector C.1.3 Detail Screen screen includes all the fields contained on the screen, as DETAIL MAIN well as the TTL and Relay fields and fields to control detection. Refer to screen for a description of fields that are common to both MAIN screens.

  • Page 81: C.1.4 Method

    Specifies the method number (1 through 99) to edit. Note: Method number 0 is reserved for methods downloaded from PeakNet 5.2 (or later), for remote control of the CD25. SAVE TO Specifies the method number (1 through 99) to save the current method to.
  • Page 82 CD25 Conductivity Detector Screen Field Description TIME Specifies the start time for each step. Times are displayed chronologically. RANGE Sets the analog output range. OFFSET Stores the offset value. The baseline is set by subtracting the offset measured when this step is executed from all subsequent measurements.

  • Page 83: Module Setup

    C • User Interface C.1.5 Module Setup The backlight intensity, key beep, and error beep are configured from the screen. MODULE SETUP M O DU LE SETU P D ISPLAY PAN EL B AC K LIG H T: M ED IU M K EY A C TU ATIO N SO U N D: E NTRY E RR O R SO U ND : Help M essage...

  • Page 84: Analog Out Setup

    CD25 Conductivity Detector C.1.6 Analog Out Setup screen contains parameters for setting the ANALOG OUT SETUP analog output, such as for a recorder or oscilloscope. AN ALO G O U T SETUP O FFSE T O U TP UT: ZER O PO SITIO N :...

  • Page 85: Time Function In

    C • User Interface C.1.7 Time Function In This screen displays the detector functions that can be controlled with TTL input from another device and lets you assign any four of the functions to the four TTL inputs. The field selects the type of input MODE signal the detector will respond to.

  • Page 86: C.2 Diagnostic Screens

    CD25 Conductivity Detector C.2 Diagnostic Screens To access the CD25 diagnostics, select the from the DIAGNOSTIC MENU MENU of . While a diagnostic screen is displayed, pressing the button Menu SCREENS returns you to the . From the , pressing...

  • Page 87: Power-Up Screen

    C • User Interface C.2.2 Power-Up Screen screen displays the revision numbers for the Moduleware POWER-UP and BIOS code. It also displays the identification number of the optional DX-LAN interface, if connected. C D 25 C O N D U C TIVITY D ETEC TO R M O D U LE WA R E R E V n.nn B IO S R E V n.nn...

  • Page 88: Elapsed Time

    CD25 Conductivity Detector C.2.3 Elapsed Time This screen reports for how long various CD25 parameters have been in use. The status of each parameter updates in real time. E LA PS ED TIM E R ES ET M O D U LE O N :...

  • Page 89: Analog Status

    C • User Interface C.2.4 Analog Status This screen reports the status of several analog test points. If a run is in progress, the status updates are from the last idle state. If no run is in progress, the values are in real time. A NA LO G STATUS SRS CO N NE CTED : DS3 C O NN EC TE D:...

  • Page 90: Dx-Lan Status

    CD25 Conductivity Detector C.2.5 DX-LAN Status The DX-LAN driver monitors several types of errors that may occur on the network. The detector reads the DX-LAN error counts and displays them on this screen, along with the DX-LAN addresses. Most errors are caused by a defective cable, missing or incorrectly terminated cable.
  • Page 91 C • User Interface Screen Field Description ALIGNMENT Indicates that a packet was received with an alignment error, meaning that there were one to seven extra bits at the end of the packet. This is usually caused by a collision or a faulty transceiver.

  • Page 92: Keyboard Test

    CD25 Conductivity Detector C.2.6 Keyboard Test You can conduct an interactive test of the CD25 front panel keypad from this screen. Pressing any front panel button changes the corresponding button indicator on the screen to reverse video. This confirms proper operation of that button.

  • Page 93: Diagnostic Tests

    C • User Interface C.2.7 Diagnostic Tests These tests verify the integrity of the detector electronics and functions. D IA G N O S TIC TES TS C E LL: IN T N O IS E TE ST: R D Y D A C R A M P : R D Y S C O PE TE ST: R D Y...
  • Page 94 CD25 Conductivity Detector Screen Field Description CDF—Tests the CD Offset DAC output (TP9 on the SP card) and the CD fine filter circuit (TP19 on the SP card). TP9 outputs a square wave with a frequency of 200 ms and an amplitude from 0 to -0.1 V.

  • Page 95: Leak Sensor Calibration And Status

    C • User Interface C.2.8 Leak Sensor Calibration and Status This screen reports the status of leak sensor parameters. LEAK SEN SO R C ALIB RATIO N A N D STATU S M EA SU RED VALU E: 2.48 CU R REN T CO N D ITIO N: D RY CA LIBR ATIO N VALU E: 2.50...

  • Page 96: Signal Statistics

    CD25 Conductivity Detector C.2.9 Signal Statistics This screen enables you to monitor the selected input to the A/D circuitry. When the screen is first displayed, the status values are equal to the value, and reads 0. Status values are INPUT DURATION reported in A/D volts and are updated dynamically.

  • Page 97: Calibrate Conductivity Cell

    C • User Interface C.2.10 Calibrate Conductivity Cell This screen allows you to calibrate the conductivity cell with 1 mM KCl. See Section 5.4 for detailed instructions. CA LIBR ATE C O N DU CTIVITY C ELL M EA SU RE D C O N DU C TIVITY: 146.54 uS C ELL CA LIBR ATIO N C O N STAN T: 160.0...
  • Page 98 CD25 Conductivity Detector C-22 Doc. 031687-01 04/2000...

  • Page 99: D • Ttl And Relay Control

    D • TTL and Relay Control The strip of eight 2-pin connectors on the CD25 electronics chassis provides two relay outputs, two TTL outputs, and four TTL inputs (see Figure D-1). Connect the outputs to the TTL or relay inputs of a Dionex or non-Dionex device to control functions in the connected device.

  • Page 100: Ttl And Relay Connections

    The signal wire goes on top and the ground wire goes on the bottom of each plug. 2. Connect these plugs to the TTL or relay connectors on the CD25 and the other module(s) as needed for your application. Check the polarity of each connection.

  • Page 101: Ttl And Relay Output Operation

    D • TTL and Relay Control D.2 TTL and Relay Output Operation The CD25 provides two TTL outputs and two relay contacts to control functions in external devices such as an integrator, autosampler, or another Dionex module. After connecting the TTL and Relay outputs (see Section D.1), toggle the output...

  • Page 102: Ttl Input Operation

    CD25 Conductivity Detector D.3 TTL Input Operation D.3.1 TTL Input Functions The four TTL inputs can be connected to devices capable of providing TTL output signals. Signals from the connected devices can control up to four of the functions listed below. In the...

  • Page 103: Ttl Input Signal Modes

    The default signal mode, normal edge, is compatible with the output signals provided by Dionex modules. If the device connected to the CD25 outputs a different signal type, select the appropriate signal mode from the...
  • Page 104 CD25 Conductivity Detector Figure D-4. TTL and Relay Input Signal Modes Doc. 031687-01 04/2000...

  • Page 105: E • Signal Processor Functions

    E • Signal Processor Functions The functions of the Signal Processor (SP) card are as follows: Temperature compensation digital-to-analog converter Cell chopper, driver Offset digital-to-analog scaling switch Conductivity signal receiver Second stage amplifier and gain switch Synchronous rectifier 5 mS Noise filter DC amplifier 100 mS filter Signal selection (MUX) 16-bit Analog-to-digital converter...
  • Page 106 CD25 Conductivity Detector Doc. 031687-01 04/2000...

  • Page 107: F • Connector Pinouts

    SRS Supply Voltage DS3 Supply Current Conductivity Cell Flow Stream Temperature This pin is not used by the CD25. This pin is not used by the CD25. +10 V Reference from SCR Card This pin is not used by the CD25.

  • Page 108: Signal Electrical Parameters

    CD25 Conductivity Detector F.1.1 Signal Electrical Parameters Pin 1 Attach the negative input of the chart recorder to pin 1. Pin 2 The full-scale output range setting (0 to 0.01 V, 0 to 0.1 V, or 0 to 1.0 V) is selected from the screen.
  • Page 109 F • Connector Pinouts Pin 6 This pin is not used by the CD25. Pin 7 This pin is not used by the CD25. Pin 8 The signal is 10.00 ± 0.01 V. The output resistance is 0 W. The maximum load current capability is 10 mA. This output may be divided with a resistor network to provide an offset to a monitoring device.

  • Page 110: Ttl/Relay Pinouts

    CD25 Conductivity Detector TTL/Relay Pinouts The TTL and Relay connectors are on the DX-LAN/Relay card. The TTL and Relay connectors all have the same pinout configuration; be careful to use the correct connector. Connector Number Pin Number Description Relay 1...

  • Page 111: Ds3 Connector Pinouts-Scr

    F • Connector Pinouts DS3 Connector Pinouts—SCR The DS3 Detection Stabilizer connects to the SCR card. The connector is a double-row, 1.6 cm (0.63 in) latching displacement connector. Pin Number Description DS3 Ground (body) +24 V Base Drive Emitter Emitter Thermistor Ground Thermistor Leak +5 V...

  • Page 112: Srs Connector Pinouts-Scr

    CD25 Conductivity Detector SRS Connector Pinouts—SCR The SRS (Self-Regenerating Suppressor) connects to the SCR card. The connector is a double-row, 0.84 cm (0.33 in) latching displacement connector. Pin Number Description Ground Thermistor SRS Positive SRS Negative Disconnect Sense Disconnect (Ground) Table E-5.

  • Page 113: G • Reordering Information

    G • Reordering Information Part Number Item Quantity 044130 DS3 Detection Stabilizer 044132 Shielded Cell 043276 Dionex Ferrule Fittings 043275 10-32 Fitting Bolts 042690 0.25-mm (0.010-in) ID Tubing (for cell outlet backpressure) 042627 Union (for connecting backpressure tubing to waste line)
  • Page 114 CD25 Conductivity Detector Doc. 031687-01 04/2000...
  • Page 115 Cards, 2-9 Scale factor, C-3, D-5 See also Names of cards Setup screen, C-8 Cascading hubs, B-5 Specifications, A-1 CD25 Conductivity Detector Analog output filter, C-8 Analytes detected by, 1-1 Analog Status screen, C-13 Diagnostics, C-10 Analog test points, C-13...
  • Page 116 CD25 Conductivity Detector Clock Front panel button, 2-4 See Method clock Deleting Coaxial DX-LAN cable installation, B-7 Field entries, 2-4 Column switching valve Method steps, 2-4, 3-6 Selecting, C-3 Methods, 3-6 Components, 2-13 Description Conductivity cell, 2-12 TTL input control, D-4...
  • Page 117 Index Leak sensor, 2-13 TTL/Relay connections, D-2 Liquid leaks, 4-4 Electrostatic discharge (ESD), 2-8 Operating modes, B-9 Eluents Replacing the cell, 5-2 Conductivity suppression, 2-12 Set point, 2-10 Environmental specifications, A-1 Set point test, C-18 Event marker, 2-3, C-6, D-5 Specifications, A-3 External regenerant mode, B-9 Start-up, 3-1...
  • Page 118 CD25 Conductivity Detector Inserting Method steps, 2-3, 3-5 DS3, 4-4 Installation, B-1 Eliminating, 5-2 Detector interface card, B-3–B-4, B-6–B-7 Local mode, C-3 DS3 Detection Stabilizer, B-9 Commands allowed, 2-17 DX-LAN, B-3 Selecting Power connection, B-1 Locked Remote mode, 2-17 Shielded conductivity cell, B-9...
  • Page 119 Index Creating, 3-4, C-5 Definition, 2-2 Parts replacement, 5-1 Deleting, 3-6 See Also Service procedures Deleting a step, 3-6 Peaks Editing, 3-5 Reversing, C-8 Number allowed, 2-18 Physical description Parameters controlled by, C-5 Display screens, 2-6 Running, 3-3, C-5 Polarity, C-8 Saving, 3-5 Power Saving changes, 3-6...
  • Page 120 CD25 Conductivity Detector Relay control Removing air from the conductivity cell, Connections, 2-9 Turning on/off, C-4, C-6 Shielded conductivity cell, 2-14 Remote mode, 2-17, C-3 See Also Conductivity cell Locked Remote, 2-17 Ambient temperature changes, 4-2 Selecting Installation, B-9 Replacement parts, 5-1...
  • Page 121 Index Time Weight of the detector, A-1 Creating timed steps, 3-4 Detector has been in use, C-12 Field on the Method screen, C-6 See Also Method clock Time Function In screen, D-5 Troubleshooting See Also Diagnostics Cell calibration, 4-7 Cell constant reading inaccurate, 4-7 Diagnostic tests, 4-8 DS3 leaks, 4-4 DS3 temperature reading inaccurate, 4-6...
  • Page 122 CD25 Conductivity Detector Index-8 Doc. 031687-01 4/2000...

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