Agilent Technologies 6850 Series II Instruction Manual

Installing a Split/Splitless Inlet
Agilent 6850 Series II Network GC System
Accessories G2652A (Standard) and G3343B (High-Pressure)
This kit contains:
The inlet and flow module are a factory-assembled and leak-tested unit. Do
not disassemble it during installation.
Description Quantity
T-20 Torx® screws, M4 x 8 mm 2
Machine screws M4 x 0.7 12 mm 6
Bottom cup insulation 1
Middle cup insulation 1
Top cup insulation 1
Insulation cup 1
Disposable wrist strap 1
Top block insulation 1
Bottom block insulation 1
Split/Splitless capillary inlet system 1
ChemStation CD (G3343B only) 1
6850 GC User Information CD-ROM (G3343B only) 1
Installation sheet (this document) 1

2
Installing a Split/Splitless Inlet
Insulation cup
Bottom block insulation
Top block insulation
Screws
Split/Splitless
capillary inlet
system
1
2
3
4
Disposable wrist strap
Bottom cup insulation
Middle cup insulation
Top cup insulation
1- Flow Module
2- Split vent trap
3- Heater/Sensor cable
4- Inlet assembly

Installing a Split/Splitless Inlet
Required tools
3
Required tools
•Inletwrench
• T-20 Torx screwdriver
Overview
Caution Before starting, review the safety information listed at the end of this
document.
1. Disconnect the GC.
2. Remove the lid top cover.
3. Remove the existing inlet, if necessary.
4. Install the new inlet.
5. Restore the GC to operating condition.

4
Installing a Split/Splitless Inlet
Disconnect the GC
Disconnect the GC
WARNING Hydrogen gas is flammable and potentially explosive. Before replacing the
flow module, turn off the hydrogen gas at the source.
WARNING Hazardous voltages are present in the instrument whenever the power cord
is connected. Avoid a potentially dangerous shock hazard by disconnecting
the power cord before working on the instrument.
1. Turn off the GC and unplug the power cord. Allow time for all heated
zones to cool.
2. 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.
3. Turn all gases off at their sources. Disconnect the carrier and detector
gas tubing from the back panel of the instrument.
Disconnect gas supply tubing
from these fittings

Installing a Split/Splitless Inlet
Remove the lid top cover
5
Remove the lid top cover
Remove the existing inlet
If the GC currently has an inlet installed, you must remove it.
1. Loosen the screws holding the connector cover plate next to the inlet
flow module.
Lid top cover, without
valve box accessory
Remove T-20 Torx
screws (8 places)
Remove detector
cover, if desired
Remove vent tubing,
if present
Loosen
Disconnect
Remove

6
Installing a Split/Splitless Inlet
Remove the existing inlet
2. Slide the cover plate off and disconnect the cable from the flow module.
3. Disconnect the gas fitting on the back of the flow module.
4. Remove the three screws on top of the flow module.
5. To continue this procedure, see the following section corresponding to
the type of inlet you are removing.
Cool On-Column inlet
1. Use a T-20 Torx screwdriver to loosen the three captive screws that
attach the inlet weldment to the top of the inlet carrier.
2. Slide the inlet up and out of the carrier. If necessary, you can also slide
the insulation sleeve off of the bottom of the inlet.
Purged Packed inlet
1. Trace the heater/sensor cable from the inlet to the wiring harness
connector. Disconnect it.
2. Remove the three screws holding the inlet.
3. Lift the inlet and flow module out of the lid. Remove the insulation in
the hole under the inlet.
Programmable Temperature Vaporization inlet
1. Lift the PTV inlet up.
2. Remove the heater connector from the side panel.
3. Disconnect the power cable, thermocouple connector, and cryo
connector from the flow module and board. Disconnect the module
ribbon cable from the pneumatics board.
4. Slide the flow module out of the chassis, remove the chemical trap
assembly from the mounting bracket, and remove the PTV assembly
from the GC.

Installing a Split/Splitless Inlet
Remove the existing inlet
7
Split/Splitless inlet
1. Use the inlet wrench to release the large nut on top of the inlet.
2. If you do not have a gas or liquid sample valve—Remove the insert
weldment and the flow module.
If you do have a gas or liquid sample valve—The insert weldment is
part of the valve assembly. Move it out of the way. Disconnect the gang
block fitting (also part of the valve assembly) from the flow module.
Remove the flow module.
3. Use forceps to remove the liner and O-ring.
4. Disconnect the split vent trap.
5. Trace the heater/sensor cable to the wiring harness connector.
Disconnect it.
6. Remove the three screws holding the inlet body.
7. Lift the inlet assembly out of the lid. Remove the insulation in the hole
under the inlet.
Large nut
Insert weldment
(includes nut)
Disconnect
Top of liner

8
Installing a Split/Splitless Inlet
Install the new inlet
Install the new inlet
1. Remove the center plug from the bottom block insulation. Place the
remaining ring in the inlet hole.
2. Place the top block insulation in the hole. Align the long sides of the hole
parallel to the sides of the lid.
3. Place the flow module in position and secure it with three screws.
4. Align the inlet as shown. Lower it into the block insulation.
5. Secure the inlet with three screws.
6. Remove the center plugs from the three pieces of cup insulation. Place
the bottom, middle, and top insulation rings in the insulation cup.
7. Push the insulation cup up over the bottom end of the inlet and secure
to the oven top with two screws.
Split
Mounting
vent
connection
screws

Installing a Split/Splitless Inlet
Install the new inlet
9
8. Plug the flow module cable into its connector. Replace the connector
cover plate and tighten the screws.
9. Connect the carrier supply line to the back of the flow module.
10. Connect the heater/sensor cable to the wiring harness.
Tighten
Connect
Gang block fitting
Wiring harness connector

10
Installing a Split/Splitless Inlet
Restore the GC to operating condition
11. If you do not have a gas or liquid sample valve—Connect the insert
weldment to the inlet body and tighten the large nut with the inlet
wrench.
If you do have a gas or liquid sample valve—Connect the insert
weldment attached to the valve to the inlet body and tighten the large
nut with the inlet wrench. Connect the gang block fitting attached to the
valve to the front of the flow module.
Restore the GC to operating condition
1. Install the capillary adapter, if used.
2. Restore the column connection.
3. Restore carrier and other gases to the instrument.
4. Restore power.
5. Apply your normal operating pressures. Leak-check the manifold, back
panel, and column fittings.

Installing a Split/Splitless Inlet
Restore the GC to operating condition
11

permission is prohibited, except as allowed under the copyright laws.
© Agilent Technologies, Inc. 2004
All Rights Reserved. Reproduction, adaptation, or translation without
Part number G2652-90108
First Edition, May 2004
Printed in USA
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610
Safety Symbols
Warnings in the manual or on the instrument must be observed during
comply with these precautions violates safety standards of design and
liability for the customer’s failure to comply with these requirements.
In the manual
A warning calls attention to a condition or possible situation that could
A caution calls attention to a condition or possible situation that could
On the instrument
all phases of operation, service, and repair of this instrument. Failure to
the intended use of the instrument. Agilent Technologies assumes no
cause injury to the user.
damage or destroy the product or the user’s work.
G2652-90108
Acknowledgements
Torx®is a U.S. registered trademark of Textron, Inc.
Replaces part numbers G2652-90100 and G2652-90107
See accompanying instructions for more information.
Indicates a hot surface.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
Indicates explosion hazard.
Indicates radioactivity hazard.
Indicates electrostatic discharge hazard.
Indicates a pinch hazard.