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5. Adjust the column position so that the cor-
rection fluid mark on the column is even with
the bottom of the column nut.
Correction fluid mark
6. Tighten the column nut finger tight, then
withdraw the column about 1 mm. Use a
wrench to tighten the nut an additional
1/4 turn.
Released: April 2004
7. After the column is installed at both inlet and
Windows, filters, and seals
Column bleed and/or effluent can contaminate
the first quartz window (heat shield) nearest the
detector module. Dust, fingerprints, atmospheric
contaminants can dirty both quartz windows, the
filter, and/or the photomultiplier tube window.
Contamination anywhere along the light path
between flame and PMT can reduce detector
sensitivity.
6850 Series Gas Chromatograph Service Procedures
detector, establish a flow of carrier gas
through the inlet. Heat the oven, inlet, and
detector to operating temperatures. Allow
them to cool and then retighten the fittings.
176
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