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Problems when starting evacuation
6. Pirani gauge, IC value too high, IG does not light
Check the column flow rate.
□ Is the column flow rate within the recommended range?
At a column flow rate of approximately 2mL/minute, the Pirani gauge value is about
40Pa or lower at the start of evacuation and about 1 to 10Pa after one day.
The normal IG gauge value after one day is no more than 1 to 2E
-3
Pa.
(See Appendix E in the System User Guide.)
Check the N
2
(m/z28) and O
2
(m/z32) values.
□ If these values are larger than the m/z18 value
Check for looseness in the column connector and for damage to the input septum or
column.
Check the carrier gas piping.
Thoroughly purge the piping when GC/MS has been newly installed.
(After purging at the GC connector for several minutes, turn on the GC power, set the
purge flow and total flow to maximum, and leave for 10 or 20 minutes.)
Follow the vacuum-leak check procedures in the System User Guide to identify
vacuum leak positions.
Check IG.
□ Is the IG filament burned out?
An error is displayed if the IG filament is burned out.
□ Is the connector wired correctly?
Refer to sections 4.6 PCB Assy, MAIN CTRL-A and 4.9 PCB Assy, IC CTRL-A when
checking the IG control.
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