10 Maintaining the VI
To Bakeout Contaminants from the VI Inlet
Maintaining Your GC 177
To Bakeout Contaminants from the VI 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.
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.
6 Set the inlet and oven 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.
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