4 Maintaining Capillary Columns
To Reverse a Column and Bakeout Contaminants
Maintaining Your GC 39
9 Set the column flow to the normal operating value, or set the capillary column gas velocity
to 30 cm/s.
For Split/Splitless inlets, select split mode and set the split vent flow to 200 mL/min.
10 Purge the column with carrier flow for at least 10 minutes before heating the oven.
11 Set the inlet temperature to 300 °C or 25 °C above the normal operating temperature.
12 Set the column oven 25 °C above the GC method final oven temperature to bake
contaminants out of the inlet, mostly through the split vent. Do not exceed the column
manufacturer’s maximum temperature limit.
13 Bakeout for 30 minutes.
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