Routine Maintenance: Inlets
Maintaining a purged packed inlet
Released: March 2004 6850 Series II GC User Information page 149 of 256
7. Loosen the knurled nut and pull it upward. The O-ring will be visible.
Replace it if it is hard and brittle or cracked. See “Changing the O-ring” on
page 142 for details.
8. Open the oven lid. Use a light source to illuminate the inside of the inlet
from inside the oven while looking through the inlet from the top. If
deposits are present, they should be visible.
9. Insert the brush into the inlet. Scrub the interior walls of the inlet
vigorously to remove all deposits. You may need to wet the brush with sol-
vent. Use a burst of compressed air or nitrogen to dry the inlet and remove
loose contaminants.
10. Replace the top of the inlet and tighten the knurled nut. Replace the
column. See “Columns and Traps” on page 21 for details.
11. Restore the GC to normal operating conditions.
Replacing the inlet flow module
Replacing the purged packed inlet flow module is similar to replacing a
split/splitless inlet flow module. See “Replacing the inlet flow module” on
page 124.
O-ring
Pulling up on the
entire top of inlet.
knurled nut removes
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