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4
Installing 7890 GC Columns
To Install a Capillary Column in a Split/Splitless Inlet
78
7000/7010 Series TQ GC/MS Operating Manual
10
Adjust the column position so the septum is even with the bottom of the
column nut.
11
For the self-tightening column nut, finger-tighten until it begins to grip the
column, then turn an additional 30 to 60 degrees until tight.
For the standard column nut, (shown in
) tighten the nut an
additional 1/4 to 1/2 turn. The column should not slide with a gentle tug.
12
Start the carrier gas flow.
13
Verify flow by submerging the free end of the column in isopropanol. Look for
bubbles.
CAUTION
Never use a wrench to tighten a self-tightening nut. This may result in damage
to the nut or instrument.
Figure 19.
Installing a capillary column for a split/splitless inlet
Insulation cup
Reducing nut
Capillary column
Ferrule (inside nut)
Inlet column nut
Septum
4 to 6 mm
The traditional inlet
column nut is shown,
and the recommended
self-tightening inlet
column nut is also
provided but not shown.