Maintenance and Troubleshooting 5
Chromatographic symptoms
Agilent Gas Sample Selector for 8860 and 8890 User Manual 81
5 Connect a flow meter to the GC GSV sample out tubing to measure the sample
flow rate during selector loading stage and ensure that it matches the flow rate
set during installation. If the flow is zero or too low (normally the sample flow
>50 mL/min), there may be a restriction or leak in the selector system.
(See Restriction and leak check on page 82).
6 If no issues were found from step1 to step 5, refer to the GC troubleshooting
manual to screen the GC system.
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.
3 Run 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 cylinders from the selector. Run Sweep mode in maintenance,
purging the whole system using N
2
to see if the ghost peaks/carryover goes
away or get smaller. (before running sweep, make sure to connect Swagelok
male connector to keep the flow path open). (See Sweep mode on page 74).
5 Clean or change the filters. (See Replace gas filter for cylinder version on
page 66).
6 Refer to the GC troubleshooting manual to screen the GC system.
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