Maintaining the Split/Splitless Inlet 4
Maintaining Your GC 57
To Bakeout Contaminants from the Split/Splitless Inlet
1 Put the inlet into split mode.
2 Set the column flow to the normal operating value, or set the
capillary column gas velocity to 30 cm/s.
3 Set the inlet split vent flow to 200 mL/min.
4 Purge the column with carrier flow for at least 10 minutes
before heating the oven.
5 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.
6 Set the inlet temperature to 300 °C or 25 °C above the
normal operating temperature to bakeout contaminants from
the inlet, mostly through the split vent.
7 Set the column oven 25 °C above the GC method final oven
temperature to bake contaminants from the column. Do not
exceed the column manufacturer’s maximum temperature
limit.
8 Bakeout for 30 minutes or until the detector baseline is free
of contamination peaks.
WARNING
Be careful! The oven, inlet, and/or detector may be hot enough to
cause burns. If they are hot, wear heat-resistant gloves to protect
your hands.
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