296 Maintaining Your GC
15 Maintaining the FPD
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4 Insert the end of the column through the column
measuring tool so that the end protrudes beyond the tool.
5 Tighten the column nut until it grips the column. Tighten
the nut an additional 1/8 to 1/4 turn with a pair of
wrenches. Snug the septum against the base of the
column nut.
6 Use a wafer cutter at 45° to score the column.
7 Snap off the column end. The column may protrude about
1 mm beyond the end of the tool. Inspect the end with a
magnifying loupe to make certain that there are no burrs
or jagged edges.
8 Remove the column, nut, and swaged ferrule from the
tool.
9 Wipe the column walls with a tissue dampened with
isopropanol to remove fingerprints and dust.
10 Carefully thread the swaged column up into the detector
fitting. Finger- tighten the column nut, then use a wrench
to tighten an additional 1/8 turn.
137.5 mm
Score column here
Ferrule
Column nut
Column measuring tool
Good
Bad
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