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 Figure 19) 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.
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.
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