Agilent Technologies G1563A Manuale utente

Installation Guide

Thermal Conductivity Detector on a 6890 GC

Accessories G1563A, G1592A

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 G1532-90337

First Edition, AUG 2001

Printed in USA

Safety Information

The Agilent Technologies 6890 Gas

Chromatograph 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 6890 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. The battery contained in

this instrument is recyclable.

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.

+Indicates a hot surface

*Indicates earth (ground) terminal

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)

Overview

This document contains the procedure for installing a thermal conductivity

detector (TCD) on an Agilent 6890 Gas Chromatograph (hereafter referred

to as the GC). Review the safety information on the inside front cover before

following this procedure.

Parts list

EPC

•TCD

• Two screws for attaching the detector to the oven top

• Top insulation

• Bottom insulation

NonEPC

•TCD

• Two screws for attaching the detector to the oven top

• Makeup and reference gas regulator

• Two screws for installing the makeup and reference gas regulator

• Top insulation

• Bottom insulation

Tools

• Electrostatic protection such as a grounded wrist strap (part no.

9300-0969 for large wrists or part no. 9300-0970 for small wrists)

• T-20 Torx screwdriver

•Diagonalcutters

• Small flat-blade screwdriver

• 7/16-inch wrench (nonEPC detectors only)

Overview

Steps

1. Preparing the GC

2. Installing the flow manifold

3. Installing the regulator (nonEPC detectors only)

4. Positioning and securing the detector

5. Connecting the detector

6. Routing the tubing

7. Restoring the GC to operating condition

8. Calibrating your detector (EPC detectors only)

Overview

Thermal conductivity detector

Makeup and reference

gas regulators

(nonEPC only)

Switching

valve leads

Printed circuit board

Power switch

Preparing the GC

WARNING Hazardous voltages are present in the mainframe when the GC is plugged in.

Avoid a potentially dangerous shock hazard by unplugging the power cord

before removing the side panels.

1. Turn off the GC and unplug the power cord. Allow time for all heated

zones to cool and then turn off supply gases at their sources.

From the back of the GC (see the figure on the next page):

2. Unsnap and lift off the pneumatics top cover.

3. Remove the RFI cover. Remove the screw with a T-20 Torx screwdriver,

slide the cover to the left until it disengages from the top rear panel, and

remove it.

4. If you are installing a nonEPC detector, remove the detector cover plate

from the front or back position by loosening the two screws with a T-20

Torx screwdriver and sliding the plate up and off.

Preparing the GC

5. Loosen the five screws in the top rear panel with a T-20 Torx

screwdriver. Grasp the panel at each end and gently lift it up and then

away from the GC. Be careful not to disrupt the supply tubing.

6. Raise the gray plastic top cover (with the holes and ventilation slots) to

the vertical position. Examine the hinge in the right rear corner.

•Early 6890 models. The hinge is a metal bracket attached to the

oven top. Pull the clip at its top toward you to release the hinge pin.

Push the pin to the left to release the cover. Raise the right side of

the cover and remove it.

Loosen five screws

Pneumatics cover

RFI cover

Detector cover plate

Preparing the GC

•Current 6890 models. Raise the right side of the cover and lift to

remove it.

Caution Board components can be damaged by static electricity; use a properly

grounded static control wrist strap when removing the electronics covers.

7. Remove the electronics side and top covers.

Loosen

screws

Press rear

tab (under

cover) and

lift off

Side cover Top cover

Installing the flow manifold

This section describes installation of the current version of the pneumatics

module. For information on the earlier version, see the Appendix.

Caution It is not necessary and not advisable to separate detectors from their

pneumatics modules. Doing so can cause leaks. Although handling the

detector and pneumatics module as a unit is awkward, it can be managed.

1. Locate the correct slot for the pneumatics module.

•Detector in the front position. Use the second slot from the left, as

viewed from the back of the GC.

•Detector in the back position. Use the third slot from the left, as

viewed from the back of the GC.

Caution Hold the manifold by its support bracket to avoid damaging the components.

2. Route the ribbon cable behind the manifold assembly as shown in

Figure 1. Slide the manifold and bracket assembly into the slot until the

bracket seats flush against the end of the rails. See Figure 2.

Figure 1. Routing the ribbon cable

Back view of manifold Manifold installed with cable routed to left

Installing the flow manifold

Figure 2. Manifold, after installation

3. Secure the manifold in place using a Torx T-20 screw from the front of

the pneumatics chassis.

4. Route the gas tubing over the top of the chassis and through the slots to

the detector location.

5. Connect the ribbon cable to the mating connector on the pneumatics

board. Arrange the cable to keep it away from the valves and keep it

from being pinched between board components and the manifold.

For the back detector, you may want to loosen the manifold and slide it

out of the carrier a few centimeters to connect the cable to the

pneumatics board. Then, reinstall the manifold.

6. Using a pair of needle-nosed pliers, remove the appropriate top rear

panel detector cutout for the TCD. Also remove any cutouts needed to

access other manifolds or accessories installed in the GC. See Figure 3.

Bracket is flush with

Route tubing along

carrier rails

this path

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