Maintenance and Troubleshooting 5
Restriction and leak check
Agilent Gas Sample Selector for 8860 and 8890 User Manual 83
• If there is a flow in the pagoda head connector, there is a leak in the system.
Contact Agilent for further support.
• If no flow detected, move to step 5.
5 Run the Sweep mode in the Maintenance tab for each position. Use the flow
meter to measure the flow at the pagoda port for all 8 positions. Record and
compare the flow rate.
• If the pagoda measured flow rate at one or several positions is significantly
lower than other positions, check whether the filters corresponding to these
positions are properly installed and connected.
• If all the pagoda measured flow rate is similar, move to step 6.
6 Remove the purge gas supply and connect a flow meter to the purge gas fitting
on the back of the Selector.
7 Run the Sampling mode in the Maintenance tab, check whether flow can be
measured at the purge gas port. If so, contact Agilent for further support.
To check the restriction and leak for Cylinder version gas selector
Use a stable and safe gas cylinder (Air or N
2
etc.) with a two-stage pressure
reducing valve as the test sample.
Connect the gas source to a quick-plug connector.
1 Confirm the needle valves at the back of selector are not fully closed.
2 Remove the purge gas supply.
3 Connect the test gas source to one position through the quick connector.
4 Performing a pressure drop test:
a Set the N
2
or Air cylinder regulator pressure to 415 kPa (60 psi).
b Fully turn the regulator pressure adjustment knob counterclockwise to shut
the secondary valve.
c Wait for one minute. Observe and record the displayed pressure of the
secondary pressure reducing valve at that time.
d Block the exit of the GC GSV sample out with a dead plug.
e Run the Sampling mode in the Maintenance tab for the corresponding
position (0.5 to 1 minute is suggested).
f Observe and record the displayed pressure of the secondary pressure
reducing valve at that time.
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