2 Installing 7890/7820/6890/6850 GC Columns
34 5975/5977 Series MSD Operating Manual
7 Position the column so it extends 4 to 6 mm past the end of the ferrule. (See
Figure 4.)
8 Slide the septum up to the bottom of the nut to fix the correct column
insertion length.
9 Insert the column in the inlet.
10 Slide the nut up the column to the inlet base, and finger-tighten the nut.
11 Adjust the column position so the septum is even with the bottom of the
column nut.
12 Tighten the column nut an additional 1/4 to 1/2 turn. The column should not
slide with a gentle tug.
13 Start carrier gas flow.
14 Verify flow by submerging the free end of the column in isopropanol. Look for
bubbles.
See also
For more information about installing a capillary column, refer to Optimizing
Splitless Injections on Your GC for High Performance MS Analysis, Agilent
Technologies publication number 5988-9944EN.
Figure 4. 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
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