Routine Maintenance: Inlets
Maintaining a split/splitless inlet
Released: March 2004 6850 Series II GC User Information page 131 of 256
Checking the split vent line for restrictions
Over time, the split vent line (including the trap) can become obstructed with
condensed vapors and other debris. If you have access to a Control Module,
you can perform an automated test to check for split vent line restrictions that
may cause problems in using the inlet. See the Control Module documentation
for details. The Control Module test program will prompt you to complete
hardware tasks similar to the ones described in “Leak testing the split/splitless
inlet” on page 128.
Cleaning the inlet
While the inlet will seldom require thorough cleaning, deposits from injected
samples occasionally do build up inside the inlet. Before cleaning the inlet,
replace dirty inlet liners and inserts with clean ones. If changing them does not
correct the problems, then clean the inlet.
Tools
Cleaning brushes—The FID cleaning kit contains appropriate brushes
(part no. 9301–0985)
Procedure
1. Complete the following preliminary steps:
• Turn off flows to the inlet at the source
• Turn off the GC (power switch on left side) and unplug it
• Remove the inlet liner (see “To install a liner and O-ring” on page 120)
• Remove the inlet base seal (see “Replacing the inlet base seal” on
page 126)
2. Illuminate the inside of the inlet from below and look for signs of
contamination or deposits. Insert the brush into the inlet. Scrub the inte-
rior walls of the inlet vigorously to remove all deposits.
3. Blow out loose particles and dry thoroughly with clean compressed air or
nitrogen before reassembling.
4. Reassemble the inlet using a new inlet base seal. Restore to normal
operating conditions.
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