82 Maintaining Your GC
5 Maintaining the Purged Packed Inlet
10
If required, install the detector adapter. (See “To Install a
Packed Column Adapter on a Detector Fitting” on page 83.)
11 Attach the column to the detector or detector adapter.
Finger-tighten the nut.
12 Tighten the nut an additional 1/4 turn with a wrench (for a
1/8-inch column) or an additional 3/4 turn (for a 1/4-inch
column).
13 Establish a flow of carrier gas and purge as recommended by
the packing manufacturer. Generally:
• 20 to 30 mL/min for 2-mm id glass or 1/8-inch od metal
columns
• 50 to 60 mL/min for 4-mm id glass or 1/4-inch od metal
columns
14 Restore the analytical method.
• For NPD, immediately set the bead voltage to 0.0.
15 After the GC becomes ready, wait 10 minutes then ignite the
detector flame or adjust offset on the NPD bead.
16 Allow the oven, inlet, and detector to equilibrate at operating
temperature, then retighten the fittings.
WARNING
Be careful! The oven, inlet, and/or detector may be hot enough to
cause burns. If the oven, inlet, or detector is hot, wear
heat-resistant gloves to protect your hands.
WARNING
Be careful! The oven, inlet, and/or detector may be hot enough to
cause burns. If the oven, inlet, or detector is hot, wear
heat-resistant gloves to protect your hands.
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