80 Agilent Gas Sample Selector for 8860 and 8890 User Manual
5 Maintenance and Troubleshooting
Chromatographic symptoms
Peak Areas Not Repeatable
1 There may be a restriction or leak in the selector system.
(See Restriction and leak check on page 82).
2 Refer to the GC troubleshooting manual to screen the GC system.
Low Peak Area or Height (Low Sensitivity)
1 There may be a restriction or leak in the selector system.
(See Restriction and leak check on page 82).
2 Refer to the GC troubleshooting manual to screen the GC system.
Contamination or Carryover
1 Make sure the vent outlet is not end capped.
2 Check for sample carryover from previous runs. Try to use the Sampling mode
on the Maintenance tab when connecting sample bags to the selector.
3 Run the Purge mode in maintenance, purging the system using N
2
to see if the
ghost peaks/carryover go away or get smaller.
4 Remove all the gas bags from the selector. Run Sweep mode in maintenance,
purging the whole system using N
2
to see if the ghost peaks/carryover go away
or get smaller. (See Sweep mode on page 74).
5 Clean or change the filters. (See Replace gas filter for bag version on page 62.)
6 Refer to GC troubleshooting manual to screen the GC system.
To check the chromatographic symptoms for cylinder version
Peaks Not Displayed/No Peaks
1 Check if the Selector is connected correctly to the GC.
2 Check that the actuator gas supply is connected correctly to the Air/N
2
fitting
on the back of the Selector and confirm the supply pressure is 380 kPa (55 psi).
3 Check if needle valve fitting on the back of the Selector is tightly closed.
4 Check the sample pressure of the cylinder and make sure it has a pressure of at
least 1 bar.
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