Agilent Technologies G2747A Manuale utente
Agilent Technologies
Agilent G2747A
Nickel Catalyst Kit
6890 Gas Chromatograph
Installation Guide
2 Nickel Catalyst Kit Installation Guide
Notices
© Agilent Technologies, Inc. 2002
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.
3
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
1
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
1
Screw, M4 x 12 mm,
chrome-plated
5
Screw, M4 x 16 mm 1
Performance evaluation
sample, can
1
Installation sheet (this
document)
1
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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