6 Maintaining the Purged Packed Inlet
To Install a Packed Metal Column
94 Maintaining Your GC
13 Attach the column to the detector or detector adapter. Finger-tighten the nut.
14 Using two wrenches, one on the adapter and one on the column nut, tighten the column
nut an additional 1/4 turn (for a 1/8-inch column) or an additional 3/4 turn (for a 1/4-inch
column).
15 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
16 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
17 Heat the oven to 200 °C, cool it to a safe handling temperature, then re-tighten the column
connection. (Re-tighten until snug, only about 15 degrees rotation.) Repeat two more
times. This process will set the Vespel/graphite ferrule to help prevent leaks.
18 Restore the analytical method.
• For FPD+, immediately turn off the flame.
• For NPD, immediately turn off the bead.
19 After the GC becomes ready, wait 10 minutes then ignite the detector flame or adjust
offset on the NPD bead.
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.
20 Allow the oven, inlet, and detector to equilibrate at operating temperature, then retighten
the fittings.
21 Perform the inlet Leak & Restriction test and reset the maintenance counters.
Adapter
Ferrule
Nut
Packed column
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