6 Maintaining the Purged Packed Inlet
To Install a Packed Metal Column
86 Maintaining Your GC
10 Condition the column, if necessary. See “To Condition a Packed Column” on page 92.
11 Place GC in maintenance mode: Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Start Maintenance. Wait for the GC to become ready.
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.
12 If required, install a packed column adapter onto the detector column fitting. See “To
Install a Packed Column Adapter onto a Detector” on page 88.
13 Place a nut and ferrule onto the packed column.
14 Attach the column to the detector or detector adapter. Finger-tighten the nut.
15 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).
16 Exit maintenance mode. Select Maintenance > Instrument > Perform Maintenance >
Maintenance Mode > Finished.
17 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
18 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.
19 Restore the analytical method.
• For FPD+, immediately turn off the flame.
• For NPD, immediately turn off the bead.
20 After the GC becomes ready, wait 10 minutes then ignite the detector flame or adjust
offset on the NPD bead.
Adapter
Ferrule
Nut
Packed column
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