Troubleshooting Tasks 8
Agilent 7890 Series Troubleshooting 187
• Check that the split vent line is free from contamination
or restrictions.
2 Run the inlet trap check. See “To Run the Inlet Trap Check”.
3 Note the pressure. This reading is the backpressure you can
expect from a clean system with the installed liner.
4 Determine a practical split vent backpressure limit.
Use the GC normally. Periodically rerun the inlet trap check.
You will need to change the split vent trap when either:
• You see chromatographic issues related to a restriction in
the split vent, typically poor split mode area repeatability,
or
• The reported test pressure approaches or exceeds the
method column head pressure setpoint.
Run the inlet trap check and note the pressure. Change the
split vent trap.
5 Set a warning limit and behavior, if desired.
Now that you know when the trap needs to be changed, you
can set one or two limits in the test. Use these limits to set
the service due indicator, or to force the GC to go Not ready.
The two limits are:
• Warning if pressure check: If the measured pressure exceeds
the limit, turn on the service due indicator.
• Fault if pressure check: If the measured pressure exceeds
the limit, make the GC Not Ready.
To set a warning limit:
a Press [Service Mode], scroll to Front inlet trap check or to
Back inlet trap check, then press [Enter].
b Scroll to the desired limit.
c Enter a limit using the keypad, then press [Enter].
(To disable a warning, select it then press [Off/No].)
The test is now set up.
6 Periodically rerun the test. When the test fails, replace the
split vent trap.
To clear a Not Ready condition or to turn off the Service Due
indicator:
1 Press [Service Mode], scroll to Front inlet trap check or to Back
inlet trap check, then press [Enter].
2 Scroll to Reset the test results? and press [On/Yes].
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