Agilent Technologies Agilent 7890 Series Maintenance Manual page 95

WA R N I N G
C A U T I O N
Maintaining Your GC
5 Tighten the inlet column nut 1/4 turn with a wrench.
Do not use hydrogen as the carrier for conditioning! It could vent
into the oven and present an explosion hazard.
After conditioning, remove the column from the inlet.
6
Simultaneously insert the column into the inlet and
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detector fittings but do not force it. It may be necessary to
start the long end of the column in the inlet at an angle to
clear the oven floor.
Withdraw the column 1 to 2 mm from both the inlet and
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detector. Finger- tighten both column nuts.
Overtightening the column nut or forcing it to bottom in either the
inlet or detector may shatter the column.
Tighten both column nuts 1/4 turn with a wrench.
9
Press [Config], [Column 1] or [Column 2], enter 0.00 in either
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Length or Diameter, and identify the inlet and detector to
which the column is connected.
Establish a flow of carrier gas and purge as recommended
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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
Restore the analytical method.
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• For FPD, immediately turn off the flame.
Maintaining the Purged Packed Inlet
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