Columns and Traps
Installing capillary columns
Released: March 2004 6850 Series II GC User Information page 33 of 256
2. Insert the adapter straight into the detector base as far as possible. Hold
the adapter in this position and tighten the nut finger tight. Use a wrench
to tighten the nut an additional 1/4 turn.
3. Install a column nut (part no. 18740-20870) and graphite ferrule (1.0 mm id,
part no. 5080-8773 or 0.5 mm id, part no. 5080-8853) on the column.
4. After installing the nut and ferrule, prepare a fresh column end by cutting
off a short piece of the column. See page 28 for instructions.
5. Position the ferrule about 153 mm from the end of the column.
Optimum height depends on sample type and gas flow rates. If it is too
high, the column end will be exposed to the flame. If too low, the sample
may be exposed to hot stainless steel, causing slight tailing.
Mark the column at a point even with the bottom of the nut. Typewriter
correction fluid works well.
6. Insert the column in the detector. Slide the nut and ferrule up the column
to the detector base. Finger tighten the column nut until it starts to grab
the column.
Detector fitting
Capillary column adapter
Mark column here
153 mm
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