82 Agilent Gas Sample Selector for 8860 and 8890 User Manual
5 Maintenance and Troubleshooting
Restriction and leak check
Restriction and leak check
To check the restriction and leak for bag version
Connect a flow meter to the vent port to measure the sample flow rate during
selector maintenance Sampling mode running and ensure that it matches the flow
rate set during installation.
• If the flow is zero or too low (normally >20 mL/min), there may be a
restriction in the selector system. See To check the gas bag selector
restriction on page 82.
• If the flow rate is normal or even exceeds the initial flow rate during
installation, and the chromatographic peak area is smaller than expected,
there may be leakage in the system. See To check the gas bag selector
leaks on page 82.
To check the gas bag selector restriction
1 Confirm the needle valves at the back of selector are not fully closed.
2 Remove all the gas bags.
3 Connect a flow meter to the vent port.
4 Run the Sampling mode in the Maintenance tab for all 8 positions. Record and
compare the vent flow of each position.
• If only one or several positions has low flow (normally >20 mL/min), while
the flow of others is normal, run the Sweep mode first, then clean or
change the filters corresponding to these positions.
• If the vent flow is basically the same in all positions and all are very low,
contact Agilent for further support.
To check the gas bag selector leaks
1 Check that the 8-way pagoda ports and the connectors between the selector
and GC GSV are connected corrected and tightened.
2 Remove all the gas bags.
3 Connect a flow meter to the current pagoda port.
4 Run the Purge mode in the Maintenance tab for corresponding position. Check
if there is flow in the flow meter.
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