Agilent Technologies 6850 Series II User Information page 178

4.
Cleaning the inlet
Most laboratories have airborne lint and dust that accumulate on the cooling
tower or septum nut and can enter the inlet or column on the syringe needle.
Particulate matter in the inlet interferes with easy passage of the syringe
needle. If dirt enters the column, it can alter the chromatography.
You can clean the needle guides, springs and inserts according to the following
procedure.
Warning Be careful! The oven and/or inlet may be hot enough to cause burns.
Materials needed:
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4.
Released: March 2004
Make sure the spring is in the inlet. Use the tweezers to place a new
septum on the bottom of the septum nut, and then reattach the septum nut
to the inlet. Tighten the nut firmly.
Restore normal GC operating conditions.
9/16-inch wrench
Narrow wire (0.02-inch diameter) or piece of capillary column (250-µm
diameter) for removing spring and insert
Small ultrasonic cleaning bath with aqueous detergent
Distilled water
Methanol
Compressed, filtered, dry air or nitrogen
Load the SERVICE method or reset the inlet and oven temperatures to
OFF or turn the main power switch off. Let the heated zones cool to room
temperature. If you have entered parameters that you do not want to lose,
store them as a method. If the detector is on, turn it off.
Turn off all flows to the inlet at the initial gas supply.
Turn off the GC and unplug it.
Remove the column. See
page 41.
6850 Series II GC User Information
"Installing columns in the cool on-column inlet" on
Routine Maintenance: Inlets
Maintaining a cool on-column inlet
page 178 of 256