184 Installation, Operation, and Maintenance
Part 3, Maintenance and Troubleshooting
11 Special Topics
Suggestions for Packed Inlets with 530-µm Columns
When using a heated, packed inlet with a 530-µm column, do the following:
• Install the column so that no more than 1 to 2 mm of the column extends
past the ferrule. This avoids large unswept volumes at the base of the inlet.
• Use polyimide ferrules (Vespel) instead of graphite. A small portion of the
column ferrule is exposed to sample vapor.
• Insulate the part of the inlet that projects into the oven. If the oven is
programmed to increase temperature, the lower part of the inlet could
become a cold spot.
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