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18

Installing Sampling Valves

Installing Sampling Valves on an Agilent 6850 Gas Chromatograph

2

Connect the control cable.

•

Connect the cable from the control 
valve to the wiring harness.

3

Install the modified top cover.

a

Place the modified lid top cover 
supplied in this kit on top of the lid.

b

Secure with eight screws.

4

Connect the external actuator air 
supply tubing.

a

Connect the air source to the fitting on 
the back of the lid (the control valve).

b

Set the source delivery pressure at 310 
to 345 kPa (45 to 50 psi).

•

Valves are gas-driven, usually by 
compressed air. There is no high 
purity requirement for this gas. The 
supply pressure may surge as the 
valve operates, so the actuator gas 
must not come from the FID air.

5

Finishing up.

a

Restore carrier and other gases to the 
instrument.

b

Restore power.

c

Apply your normal operating 
procedures. Leak-check all new 
connections.

Table 5

Installing an air control valve for a rotary-type sampling valve (continued)

Step

Action

Notes

Harness

Connector

Summary of Contents for 6850 GC

Page 1: ...Agilent Technologies Agilent 6850 GC Sampling Valves G2654A G2659A G2667A G2672A Installation ...

Page 2: ...rranties of merchantability and fitness for a par ticular purpose Agilent shall not be liable for errors or for incidental or consequential damages in connec tion with the furnishing use or per formance of this document or of any information contained herein Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with t...

Page 3: ...ion 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 c...

Page 4: ...2655A 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 ...

Page 5: ...renches 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 ...

Page 6: ...rt 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 ...

Page 7: ...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 L...

Page 8: ...es 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 ...

Page 9: ...s plumbed through an existing inlet either capillary or packed Table 3 Installing a sampling valve Step Action Notes 1 Remove the lid top cover a Remove vent tubing if present b Remove detector cover c Remove 8 T 20 Torx screws d Remove top cover 2 If 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 ...

Page 10: ...Remove the gang block fitting from the inlet flow module Be very careful not to lose the small O rings d Remove 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 ...

Page 11: ...the wiring harness Disconnect it e Trace the gas lines from the inlet to the gang fitting on the flow module Disconnect the gang fitting f Remove the three screws holding the inlet g Remove the inlet h Continue at Step 4 Note where the heater sensor cable plugs into the wiring harness You will use this location later Do not remove the insulation in the hole under the inlet 4 Lock the lid in the se...

Page 12: ...ove the stop plate and screw from the cam Install them on the new cam from the kit d Install the new cam Lower the stop plate e Pull the lid forward until the cam follower rests on the curved surface of the cam in front of the stop plate f Raise the stop plate and tighten the screw Close the lid Do not try to change the cam alone Obtain help to hold the lid in the upright position while the cam is...

Page 13: ...to the lid using four pan head screws Be sure that the small O rings are in place and that the hole patterns in the fitting and the flow module are aligned Orient the valve box so that the sample connections point to the rear of the GC Be sure that no tubing or wiring is trapped under the valve box The metering valve shown below is not present on gas sampling valves Table 3 Installing a sampling v...

Page 14: ...ation and insulation cup up over the inlet fitting and secure it to the oven top 8 Connect the valve box heater sensor cable a Locate the connector marked A on the main wiring harness b Connect the valve box heater sensor cable 9 Complete the inlet installation a Capillary inlet only Reassemble the split vent trap using the trap fitting attached to the valve box Secure the split vent trap bracket ...

Page 15: ...valve for a diaphragm type control valve Step Action Notes 1 Install the air control valve a If present remove the rectangular cover plate on the back of the lid b Attach the torque plate to the inside of the cover plate with one screw Do not tighten c Mount the cover plate torque plate assembly on the outside of the lid with two screws d Loosen the two screws on the base of the air control valve ...

Page 16: ... of the lid b Secure with eight screws 3 Connect the actuator air a Connect the air source to the fitting on the back of the lid their control valve b Set the source delivery pressure at 310 to 345 kPa 45 to 50 psi Valves are gas driven usually by compressed air There is no high purity requirement for this gas The supply pressure may surge as the valve operates so the actuator gas must not come fr...

Page 17: ... on the back of the lid b Locate the two tubes from the heated sampling valve Run them through the hole on the back of the lid c Insert the tubes in the numbered holes on the air control valve Press firmly into place Tug on the tube to verify it is connected The tubes are labeled 1 and 2 Connect each tube to the hole on the air control valve with the corresponding number Press in the black PTFE ri...

Page 18: ...to the fitting on the back of the lid the control valve b Set the source delivery pressure at 310 to 345 kPa 45 to 50 psi Valves are gas driven usually by compressed air There is no high purity requirement for this gas The supply pressure may surge as the valve operates so the actuator gas must not come from the FID air 5 Finishing up a Restore carrier and other gases to the instrument b Restore p...

Page 19: ...Installing Sampling Valves on an Agilent 6850 Gas Chromatograph Installing Sampling Valves 19 ...

Page 20: ... Agilent Technologies Inc Printed in USA May 2012 Agilent Technologies G2630 90160 ...

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