Agilent Technologies G2623A Manuale utente

Installation Guide

Thermal Conductivity Detector on a 6850 GC

Accessory G2623A

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610

USA

adaptation, or translation without

permission is prohibited, except as allowed

under the copyright laws.

Part number G2623-90107

First Edition, JAN 2001

Replaces Part No. G2623-90100 Operating

and Service Manual.

HP® is a registered trademark of

Hewlett-Packard Co.

Printed in USA

Safety Information

The Agilent Technologies Thermal

Conductivity Detector meets the following

IEC (International Electrotechnical

Commission) classifications: Safety Class 1,

Transient Overvoltage Category II, and

Pollution Degree 2.

This unit has been designed and tested in

accordance with recognized safety

standards and designed for use indoors. If

the instrument is used in a manner not

specified by the manufacturer, the

protection provided by the instrument may

be impaired. Whenever the safety protection

of the Agilent G2623 has been

compromised, disconnect the unit from all

power sources and secure the unit against

unintended operation.

Refer servicing to qualified service

personnel. Substituting parts or performing

any unauthorized modification to the

instrument may result in a safety hazard.

Disconnect the AC power cord before

removing covers. The customer should not

attempt to replace the battery or fuses in

this instrument.

Safety Symbols

Warnings in the manual or on the

instrument must be observed during all

phases of operation, service, and repair of

this instrument. Failure to comply with these

precautions violates safety standards of

design and the intended use of the

instrument. 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.

CAUTION

A caution calls attention to a condition or

possible situation that could damage or

destroy the product or the user’s work.

Sound Emission Certification for Federal

Republic of Germany

Sound pressure Lp < 68 dB(A)

During normal operation

At the operator position

According to ISO 7779 (Type Test)

Schallemission

Schalldruckpegel LP < 68 dB(A)

Am Arbeitsplatz

Normaler Betrieb

Nach DIN 45635 T. 19 (Typprüfung)

Agilent Technologies

Printed in USA Dec 2000

Agilent Part No. G2623-90107

Installing a Thermal Conductivity Detector on a

6850 Gas Chromatograph

This kit contains:

The TCD assembly is a factory-assembled, tested, and calibrated unit.

Disassembly of the unit is not required for installation.

Kit G2623-64000 Qty.

Thermal conductivity detector system 1

Performance evaluation sample kit 1

Bottom insulation 1

Seal insulation 1

Plastic grommet 1

Screw, M4 x 12 mm, pan head 5

Wrist strap, disposable, large 1

Installation sheet (this document) 1

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

Tools Required

Safety Information

Before continuing, read the safety information on your Agilent 6850 Gas

Chromatograph User Information CD-ROM.

Torx™T-20 driver

Flat blade screwdriver

Open end wrenches

Switching valve extension

Heater/sensor cable

Bottom insulation

Seal insulation

Tubing plugs

Plastic

grommet

Screws

Signal

board

PRT and

filament wires

Flow manifold cable

TCD assembly

cable and grommet

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

Prepare for Installation

WARNING Before proceeding, turn off the oven and any heated zones and let them cool

down. Turn off all detector gases at their supplies, then turn off the main

power switch and unplug the power cord.

1. Open the lid. If a column is installed, disconnect it at the detector end.

Remove the nut warmer, insulation, and capillary adapter, if present.

Close the lid.

2. Turn all gases off at their sources. Disconnect the carrier and detector

gas tubing from the back panel of the instrument.

ToBase - T

Local Talk

BNC

Disconnect gas supply tubing

from these fittings

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

Remove the Lid Top Cover

Remove the lid top cover.

Disconnect the Heater/Sensor Cable

1. Trace the detector heater/sensor cable to the wiring harness near the

injection port cooling fan.

2. Disconnect the cable.

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.

Remove vent lines,

Remove T-20 Torx™

screws (8 places)

Remove detector

cover, if desired

Lid top cover, without

valve box accessory

if present

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

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.

Counterbalance cam

Cam follower

Stop plate

Screw

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

Remove the Detector Electronics Cover

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

2. Remove the top screw on the cover.

3. Lift and remove the detector electronics cover.

Remove screw

Detector electronics cover

Loosen screws

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

4. Loosen the signal board clamp.

5. Unplug the signal board from the A/D converter board.

6. Disconnect the wiring from the signal board.

FID – Disconnect the ribbon cable. Unplug the ignitor cable. Pass both

cables through the hole to the top side of the lid.

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.

Signal board clamp

Ribbon cable

A/D converter board

Signal board

(FID shown)

Installing a Thermal Conductivity Detector on a 6850 Gas Chromatograph

TCD –Unplug the two-wire switching valve cable at the connector. To

release the PRT and filament wires, press on the orange tabs. Pass the

disconnected cables/wires through the hole to the top side of the lid.

7. Lower the stop plate on the lid cam. Pull the lid forward until the cam

follower rests on the curved surface of the cam. Leave the stop plate in

the "down" position.

8. Close the lid.

Ribbon cable connector

Ignitor cable connector

Switching valve

Filament wires

PRT wires

cable connector

Indice

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