Agilent Technologies 6850 GC User manual

Agilent Technologies
Agilent 6850 GC
Sampling Valves
G2654A - G2659A
G2667A - G2672A
Installation

2Installing Sampling Valves
Notices
© Agilent Technologies, Inc. 2012
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Manual Part Number
G2630-90160
Edition
Second edition, May 2012
First edition, November 2003
Printed in USA
Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610 USA
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met.

3
Agilent 6850 GC Sampling Valves
Installation
Agilent Technologies
Installing Sampling Valves on an
Agilent 6850 Gas Chromatograph
G2654A -G2659A
G2667A - G2672A
Installation Kits 4
Tools required 5
Safety information 5
Part Identification 6
Common parts 6
Sampling valves 7
Air control valves 8
Installing a Sampling Valve 9
Installing an Air Control Valve for a Diaphragm-Type Control Valve 15
Installing an Air Control Valve for a Rotary-Type Sampling Valve 17
This document describes installation of a gas or liquid
sampling valve on an Agilent 6850 gas chromatograph
already equipped with either a packed or capillary inlet.

4Installing Sampling Valves
Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Installation Kits
Six installation kits are available (Table 1).
Except for the sampling valve itself, which is different for
each kit, all kits contain the same items (Table 2).
Table 1 Valve installation kits
Description Inlet Assessory number rotary Accessory number diaphragm
Gas sampling valve, 6-port Packed G2667A G2654A
Gas sampling valve, 6-port Capillary G2668A G2655A
Liquid sampling valve, 4-port, 0.5 µL Capillary G2669A G2656A
Liquid sampling valve, 4-port, 1.0 µL Capillary G2670A G2657A
Liquid sampling valve, 4-port, 0.5 µL Packed G2671A G2658A
Liquid sampling valve, 4-port, 1.0 µL Packed G2672A G2659A
Table 2 Kit contents
Description Qty
Gas or liquid sampling valve and heated valve box 1
Modified lid top cover 1
Lid cam, valve box version 1
Air control valve assembly 1
Air control valve cover plate (diaphragm only) 1
Air control valve torque plate (diaphragm only) 1
10-feet plastic actuator tubing 1
Screw, M4 x 0.7, 12 mm length, pan head 9 (diaphragm)
5 (rotary)
Screw, M4 x 12, T-20 Torx 8
Installation sheet (this document) 1

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Installing Sampling Valves 5
Tools required
•Torx T- 10 driver
•Torx T- 20 driver
•Open- end wrenches
•Inlet wrench (for capillary inlet)
Safety information
Before continuing, read the safety information on your
Agilent 6850 Gas Chromatograph User Information
CD- ROM.
WARNING
Before proceeding, turn off the oven and any heated zones and let
them cool down. Turn off all gases at their source, then turn off the
main power switch and unplug the power cord.

6Installing Sampling Valves
Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Part Identification
Common parts
These are parts that are used with all gas and liquid
sampling valves (Figure 1).
Figure 1 Common parts
Counterbalance cam
Torque plate (diaphragm only)
Cover plate (diaphragm only)
Screws, pan-head
Screws, Torx, for lid
Modified lid top cover
Plastic tubing for
actuator air

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Installing Sampling Valves 7
Sampling valves
Parts for liquid and gas sampling valves are shown below.
See Figure 2 and Figure 3.
Figure 2 Valves with capillary inlet
Heated sampling valve
Heater/Sensor cable
To air control valve
Sample in/out ports Gang block fitting
Split trap fitting
Valve insert weldment
This is a liquid sampling valve. Gas sampling valves do not
have the adjustable restrictor between the sample ports.
Figure 3 Valves with packed inlet
Heated sampling valve
To air control valve
Packed inlet
Heater/Sensor cable
Gang block fitting
Heater/Sensor cable
Sample in/out ports
This is a gas sampling valve. Liquid sampling valves have an
adjustable restrictor in the hole between the sample ports.

8Installing Sampling Valves
Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Air control valves
Parts for the air control valves are show below. See Figure 4
and Figure 5.
Figure 4 Air control valve for a rotary sampling valve
Figure 5 Air control valve for a diaphragm sampling valve
Air control valve
Air control cable
To heated sampling valve
Air control valve
Air control cable
To heated sampling valve

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
Installing Sampling Valves 9
Installing a Sampling Valve
The sampling valve is installed in a heated valve box on top
of the GC. See Table 3. The box and valve is a
factory- assembled and leak- tested unit. Installation does not
require any disassembly of the unit. See the 6850 Gas
Chromatograph User Information CD- ROM.
The valve is plumbed through an existing inlet, either
capillary or packed.
Table 3 Installing a sampling valve
Step Action Notes
1Remove the lid top cover. aRemove vent tubing, if present.
bRemove detector cover.
cRemove 8 T-20 Torx screws.
dRemove top cover.
2If the valve is to replace a capillary
inlet, remove the insert weldment
and split vent trap.
If the valve is to replace a packed
inlet, continue at Step 3.
aUse the inlet wrench to release the
large nut on the inlet insert weldment.
bLift the inlet insert weldment clear of
the inlet.
Detector cover
T-20 Torx screw
(1 of 8)
Vent tubing,
if present

10 Installing Sampling Valves
Installing Sampling Valves on an Agilent 6850 Gas Chromatograph
cRemove the gang block fitting from the
inlet flow module.
•Be very careful not to lose the small
O-rings.
dRemove the split vent trap bracket
using a T-20 Torx driver.
Table 3 Installing a sampling valve (continued)
Step Action Notes
Large nut
Inlet insert weldment
Inlet flow module
Gang block fitting