Agilent Technologies Agilent 7890 Series Maintenance Manual page 91

WA R N I N G
WA R N I N G
Maintaining Your GC
Load the GC maintenance method
9
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.
If required, install the detector adapter. (See
10
Packed Column Adapter on a Detector Fitting"
page 92.)
Attach the column to the detector or detector adapter.
11
Finger- tighten the nut.
Tighten the nut an additional 1/4 turn with a wrench (for
12
a 1/8- inch column) or an additional 3/4 turn (for a
1/4- inch column).
Establish a flow of carrier gas and purge as recommended
13
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 FPD, immediately turn off the flame.
• For NPD, immediately set the bead voltage to 0.0.
After the GC becomes ready, wait 10 minutes then ignite
15
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.
16 Allow the oven, inlet, and detector to equilibrate at
operating temperature, then retighten the fittings.
Maintaining the Purged Packed Inlet
and wait for the GC to
"To Install a
6
on
91