Routine Maintenance: Inlets
Maintaining a cool on-column inlet
Released: March 2004 6850 Series II GC User Information page 178 of 256
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.
4. Restore normal GC operating conditions.
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:
• 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
1. 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.
2. Turn off all flows to the inlet at the initial gas supply.
3. Turn off the GC and unplug it.
4. Remove the column. See “Installing columns in the cool on-column inlet” on
page 41.
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