Agilent Technologies 7820A Manual page 185

Maintaining Your GC
Score the column using a glass scribing tool. The score must
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be square to ensure a clean break.
Break off the column end by supporting it against the column
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cutter opposite the scribe. Inspect the end with a magnifying
loupe to make certain that there are no burrs or jagged
edges.
Wipe the column walls with a tissue dampened with
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isopropanol to remove fingerprints and dust.
7 Insert the column into the detector until it bottoms.
8 Slide the column nut and ferrules up the column to the
detector and finger-tighten the nut.
Pull out 1 mm of column. Tighten the nut an additional
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1/4 turn with a wrench or until the column does not move.
Maintaining the TCD
Bad
Good
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