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1. 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.
2. Cut off a short piece of the column end.
3. Position the column so it extends about
153 mm from the end of the ferrule. (The
optimum height may be higher or lower,
depending on sample type and gas flow
rates. If the column is too high, it can be
exposed to the detector flame. If the column
is too low, the sample may be exposed to hot
stainless steel which can result in slight
peak tailing.)
Released: April 2004
Figure 1-16. Marking the column
4. Insert the column in the GC and detector.
6850 Series Gas Chromatograph Service Procedures
Mark the column at a point even with the
bottom of the nut. White typewriter correc-
tion fluid makes a good marking material.
See Figure 1-24 for details.
Slide the nut and ferrule up the column to the
detector base. Finger tighten the column nut until
it starts to grab the column.
153 mm
Mark column here
175
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