4 Maintaining Capillary Columns
To Reverse a Column and Bakeout Contaminants
Maintaining Your GC 37
To Reverse a Column and Bakeout Contaminants
1 Gather the following:
• 1/4-inch wrench
• Column cutter
2 Place GC in maintenance mode: Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Start Maintenance and wait for the GC to become ready.
Be careful! The oven and/or detector may be hot enough to cause burns. If the detector is
hot, wear gloves to protect your hands.
Wear safety glasses to protect your eyes from flying particles while handling, cutting, or
installing glass or fused silica capillary columns. Use care in handling these columns to
prevent puncture wounds.
3 Disconnect the column from the inlet and detector.
4 If necessary, cut a loop from the column. See “To Cut a Loop from a Column” on page 36.
Do not attach the column to the inlet.
5 Remove the column from the hanger and reverse its position (inlet and detector ends) and
place the column back on the hanger.
6 Attach the column to the inlet.
• “To Install a Capillary Column with the Split/Splitless Inlet”
• “To Install a Capillary Column with the Multimode Inlet”
• “To Install a Capillary Column with the Purged Packed Inlet”
• “To Install a Capillary Column with the Cool On-Column Inlet”
• “To Install a Capillary Column with the Programmable Temperature Vaporization
Inlet”
• “To Install a Capillary Column with the Volatiles Interface”
7 Attach your column to the detector.
• To Install a Capillary Column in the FID
• To Install a Capillary Column in the NPD
• To Install a Capillary Column in the TCD
• To Install a Capillary Column in the ECD
• To Install a Capillary Column to the FPD+
8 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
9 Set the column flow to the normal operating value, or set the capillary column gas velocity
to 30 cm/s.
For Multimode, Split/Splitless, PTV, and VI 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.
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