84 Agilent Gas Sample Selector for 8860 and 8890 User Manual
5 Maintenance and Troubleshooting
Restriction and leak check
g If there is a pressure loss greater than 7 kPa (1 psi) in any of the two
observe steps above, there is a leak within the selector, contact Agilent for
further support.
5 Turn on the cylinder valve and set the test gas cylinder regulator pressure to
415 kPa (60 psi).
6 Remove the dead plug.
7 Run the Sampling mode in the Maintenance tab for the corresponding position
(0.5 to 1 minute is suggested).
8 Measure and record the flow in GC GSV sample out tubing.
9 If you hear obvious gas flow during the loading process, it proves that the
system is leaking. Contact Agilent for further support.
10 Repeat step 3 to step 9 for each position and compare the flow rate get in the
GC GSV sample out tubing.
• If only one or several of positions has low sample out flow, while the flow of
others is normal (normally >80 mL/min), clean or change the filters
corresponding to these positions, and run the Sweep mode in the
Maintenance tab. See Replace gas filter for cylinder version on page 66,
and Sweep mode on page 74.
• If the sample out flow is basically the same in all positions and all are very
low, contact Agilent for further support.
11 Choose any position and run the Sampling mode in the Maintenance tab.
12 Check if there is a flow from purge gas fitting on the back of the Selector by
using a flow meter. If so, contact Agilent for further support.
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