Agilent Technologies G2747A Bedienungsanleitung

Agilent Technologies

Agilent G2747A

Nickel Catalyst Kit

6890 Gas Chromatograph

Installation Guide

2 Nickel Catalyst Kit Installation Guide

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from Agilent

Technologies, Inc. as governed by United

States and international copyright laws.

Manual Part Number

G2747-90107

Edition

First edition, August 2002

Replaces part number G2747-90100

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Safety Notices

CAUTION

A CAUTION notice denotes a haz-

ard. It calls attention to an operat-

ing procedure, practice, or the like

that, if not correctly performed or

adhered to, could result in damage

to the product or loss of important

data. Do not proceed beyond a

CAUTION notice until the indicated

conditions are fully understood and

met.

WARNING

A WARNING notice denotes a

hazard. It calls attention to an

operating procedure, practice, or

the like that, if not correctly per-

formed or adhered to, could result

in personal injury or death. Do not

proceed beyond a WARNING

notice until the indicated condi-

tions are fully understood and

met.

Agilent G2747A Nickel Catalyst Kit

Installation and Maintenance

Agilent Technologies

Installation and Maintenance

The Nickel Catalyst Kit, accessory G2747A, is used on the 6890

Series gas chromatograph for trace analysis of CO and CO2with

a flame ionization detector (FID). The gas sample is separated

on the column and passed over the hot catalyst in the presence

of hydrogen, which converts the CO and CO2peaks to CH4.

Requirements

•An available inlet position. The accessory is usually installed

in the back position. If you remove an existing inlet system to

make space, be sure to remove its flow module as well.

•Two nut plates (part no. 05890-80660) installed in the oven.

They are provided with Heated Valve Box kits G1580A and

G1581A.

•The packed/capillary (universal) version of the FID.

Gas sample valve Column Nickel catalyst FID

Carrier gas

Hydrogen Air

Sample

4 Nickel Catalyst Kit Installation Guide

Installation and Maintenance

Table 1 Kit contents

Kit G2747A Qty.

Nickel catalyst assembly 1

Porapak Q column 1

Inlet tube with bulkhead

fitting

Retaining nut 1

Block insulation 1

Top cover 1

Cup 1

Insulation ring 3

Locating pin 1

Brass plug, 1/8-inch 1

O-ring 3

Nut and ferrule set,

1/8-inch stainless steel

Screw, M4 x 12 mm,

chrome-plated

Screw, M4 x 16 mm 1

Performance evaluation

sample, can

Installation sheet (this

document)

Installation and Maintenance

Nickel Catalyst Kit Installation Guide 5

Part identification

Tools required

•Torx™ T-20 drive

•Flat blade screwdriver

•Open end wrenches

Porapak Q column

Top cover

Nickel catalyst assembly

NCT inlet tube with bulkhead fitting

Retaining nut

Block insulation

Cup

Insulation ring

Locating pin

Brass plug

O-rings

Nut and ferrule set

Screws, M4 x 12 mm

Screw, M4 x 16 mm

Insulation rings

Gang block fitting

Hydrogen supply tube

Exit tube

6 Nickel Catalyst Kit Installation Guide

Installation and Maintenance

Prepare the instrument

1Turn off the oven and heated zones and let them cool.

2Turn off all gases at their source.

3Turn the main power line switch off.

4Unplug the line power cord.

5Remove the column. Remove any hardware attached to the

FID (liner, column/liner nuts, ferrules, makeup gas adapter,

etc.).

WARNING Hydrogen (H2) is flammable and is an explosion hazard when mixed

with air in an enclosed space (for example, the oven). In any

application using H2, turn off the supply at its source before working

on the instrument.

Installation and Maintenance

Nickel Catalyst Kit Installation Guide 7

6If a 7683 autosampler is installed:

aLift the injector from the GC mounting post and set it

aside.

bRemove the tray by loosening/removing the three

mounting screws.

cProceed to step 8.

Tray mounting

screws

8 Nickel Catalyst Kit Installation Guide

Installation and Maintenance

7If a 7673 autosampler is installed:

aRemove the tray from the autosampler.

bLift the autosampler from its mounting bracket and set it

aside.

cRemove two screws underneath the autosampler bracket.

dRemove two screws holding the tray mounting strap.

eRemove six screws on top of the bracket. Lift the bracket

off.

Installation and Maintenance

Nickel Catalyst Kit Installation Guide 9

8Remove the injection port cover, if present, by loosening five

Torx T-20 screws and lifting it up.

9Loosen the two screws on the top edge of the left side panel.

Slide the panel slightly to the rear and lift it off.

10 Remove the electronics carrier top cover by grasping it at the

back edge and lifting upwards until its catch releases, then

pull it towards the back of the instrument.

11 Remove the top part of the back panel.

12 Remove the pneumatics cover and the RFI shield underneath

it.

Install the Nickel Catalyst Tube (NCT)

These instructions assume that you are installing the NCT in the

back inlet position.

CAUTION The insulation on the GC is made of refractory ceramic fibers (RCF).

Ventilate your work area. Wear long sleeves, gloves, safety glasses,

and a disposable dust/mist respirator. Dispose of insulation in a sealed

plastic bag.

10 Nickel Catalyst Kit Installation Guide

Installation and Maintenance

1If present, remove the cover plate from the back inlet

mounting location and remove the pre-cut insulation below

it.

2Install the block insulation in the back inlet position.

3Prepare the NCT by bending the hydrogen supply tube and

the NCT exit tube along the side of the catalyst chamber.

4Install the NCT in the block insulation with the column

fitting and exit tube inside the oven. Avoid getting insulation

inside the exit tube. Feed the heater/sensor cable out the top.

5Use the removed insulation (tear apart as needed) to fill any

space around the NCT.

6Remove the center plug from one insulation ring. Place the

insulation ring on top of the NCT. Install the cover plate on

top of the ring and secure with three screws.

7Remove the plugs from the remaining insulation rings. Place

the rings in the insulation cup. Install the cup inside the

oven over the NCT exit tube and the bottom fitting. Avoid

getting insulation inside the exit tube. Secure the cup to the

oven with two screws.

Hydrogen supply tube

NCT exit tube (to FID)

Column fitting

Heater/sensor cable

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