80 Maintaining Your GC
5 Maintaining the Purged Packed Inlet
To Bakeout Contaminants from the Purged Packed Inlet
1 Set the column flow to the normal operating value, or set the
capillary column gas velocity to 30 cm/s.
2 Purge the column with carrier flow for at least 10 minutes
before heating the oven.
3 If the column is attached to the detector, set the detector
25 °C above normal operating temperature.
If the column is not attached to the detector, cap the detector
fitting.
4 Set the inlet temperature to 300 °C or 25 °C above the
normal operating temperature.
5 Set the column oven 25 °C above the GC method final oven
temperature to bake contaminants out of the inlet. Do not
exceed the column manufacturer’s maximum temperature
limit.
6 Bakeout for 30 minutes or until the detector baseline is free
of contamination peaks.
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