Agilent Technologies G3375A Mode d’emploi

This section reviews the procedure for installing a single-channel analog

input board (AIB) on an Agilent 6850 Gas Chromatograph (hereafter called

the GC.) With the analog board installed, you can connect nonAgilent

detectors with 1 V of analog output to the GC.

This kit contains:

Description Quantity Part number

Grommet 10400-0914

Screw, M3 × 0.5, 12-mm long, pan head 10515-1084

Torx™screw, M4 × 18-mm long 20515-3034

Screw, M4 × 0.7, 12-mm long 20515-2496

Analog signal cable, general purpose, 6 pins 1G1530-60560

Analog input board 1G1556-60015

Detector PCB bracket 1G2397-00020

Insulation detector blank 1G1530-00660

MS detector plate 1G2630-20980

Installing a Single-Channel

Agilent 6850 Series II Network GC System

Analog Input Board on a 6850 GC

Accessory G3375A

Installing a Single-Channel Analog Input Board on a 6850 GC

Required tools

• Electrostatic protection such as grounded wrist strap

(part no. 9300-0969 [large] or part no. 9300-0970 [small])

• T-20 Torx screwdriver

• Small, flat-bladed screwdriver

• 1/8-inch drill bit and drill

Overview

Caution Before starting, review the safety information listed at the end of this

document.

1. Prepare the GC.

2. Remove the lid top cover.

3. Remove the existing detector and flow manifold.

4. Raise the lid to the service position.

5. Remove existing detector PC board.

6. Position the analog cable.

7. Install the AIB.

8. Install the insulation detector blank and detector plate.

9. Connect the analog signal cable to your nonAgilent detector.

10. Restore the GC to operating condition.

Installing a Single-Channel Analog Input Board on a 6850 GC

Prepare the GC

1. Load the service method or set all GC temperatures to ambient/35 °C.

2. Allow time for all heated zones to cool.

3. Turn off the GC and unplug the power cord.

4. If you have an injector installed, set it aside.

Remove the lid top cover

Remove T-20 Torx

screws (8 places)

Remove detector

cover, if desired

Remove vent tubing,

if present

Installing a Single-Channel Analog Input Board on a 6850 GC

Remove the existing detector and flow manifold

1. On the top of the lid, loosen the connector cover plate screws and

remove the plate.

2. Disconnect the gas fittings. The figure shows the µECD manifold; the

other manifolds are similar but vary in the number of gas connections.

3. Trace the ribbon cable from the flow manifold and disconnect it from

the harness.

4. Remove the three manifold mounting screws.

5. Remove the screws holding the detector assembly in place. You will

need a new top cover.

FID (flame ionization detector) – Remove four mounting screws.

Flow manifold

(

ECD shown)

Gas fittings

Cover plate

screws (4)

Manifold mounting

screws

Mounting screws

Installing a Single-Channel Analog Input Board on a 6850 GC

TCD (thermal conductivity detector) – Remove two mounting screws.

µECD (micro cell electron capture detector) - Remove four mounting

screws.

FPD (flame photometric detector) - Remove four mounting screws. You

will need a new top cover.

6. Lift the detector and flow manifold out of the lid as a unit.

Mounting screws

Two mounting

Two mounting screws

screws

Installing a Single-Channel Analog Input Board on a 6850 GC

WARNING The fibrous insulation material can cause irritation to the skin, eyes, and

mucous membranes. Always wear gloves when working with the insulation.

If the insulation is flaky/crumbly, wear protective eye wear and a respirator.

7. Remove any insulation that may be in the hole under the detector.

Raise the lid to the service position

1. Open the lid. Locate the counterbalance cam in the left rear corner

under the lid. Loosen the screw on the right side of the cam. This allows

the stop plate to drop down.

2. Raise the lid until it is stopped by the safety cable.

3. Raise the stop plate and tighten the screw to lock the lid in the upright

service position.

WARNING The lid is heavy. Always lock the lid when it is in the service position.

Stop plate (raised)

Counterbalance cam

Lid in service position

Installing a Single-Channel Analog Input Board on a 6850 GC

Remove existing detector PC board

Since there is room for only one detector on the 6850 GC, you must remove

any existing detector PC board before installing the AIB.

1. Loosen the two bottom screws on the detector electronics cover.

Caution Board compo n ents can be d amaged by stat ic electric ity; use a prope rly

grounded static control wrist strap before gaining access to the

detector electronics area and when handling the boards and any of

the cables connecting to the boards.

2. Remove the top screw on the cover.

3. Lift and remove the detector electronics cover.

Remove screw

Detector

Loosen screws

electronics

cover

Installing a Single-Channel Analog Input Board on a 6850 GC

4. Prepare the detector board for removal.

a. For small boards, such as the µECD shown below, remove the M3

screw that secures the detector board to the printed circuit board

(PCB) bracket.

M3 screw securing

board to bracket

Detector PCB bracket

Detector board

(µECD shown)

A/D converter board

Installing a Single-Channel Analog Input Board on a 6850 GC

b. For large boards, such as the FPD board shown below, remove the

detector PCB bracket holding the detector board in place.

Detector board

Detector PCB bracket

A/D converter board

(FPD shown)

mounting screw

Installing a Single-Channel Analog Input Board on a 6850 GC

5. Unplug and remove the existing detector board from the A/D converter

board. An FPD board is shown below. Other detector boards connect

similarly.

6. Disconnect and remove all cables from the old detector board.

All detectors – Disconnect the ribbon cable. The ribbon cable connector

will not pass through the rubber grommet in the hole. Use a small

screwdriver to push the grommet to the top of the lid; the cables will

now fit through the hole. Reinstall the grommet in the lid for later use

after you have removed the ribbon cable.

A/D converter board/

detector board connection

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