Routine Maintenance: Inlets
Maintaining a cool on-column inlet
Released: March 2004 6850 Series II GC User Information page 180 of 256
8. Cleaning procedure:
a. Fill the ultrasonic cleaning bath with aqueous detergent and place the
spring and the insert into it. Sonicate for 1 minute.
b. Drain the aqueous detergent and fill the bath with distilled water.
Sonicate for 1 minute.
c. Remove the parts from the bath and rinse them thoroughly with water
and methanol.
d. Dry the parts with a burst of compressed air or nitrogen.
9. Reinstall the insert. If you are using a septum nut, insert the spring and
insert with the spring on top.
10. Attach a new septum to the bottom of the septum nut. If you are using the
cooling tower assembly, insert a new duckbill septum into the spring, and
place them in the inlet.
11. Attach the septum nut or the cooling tower and tighten finger-tight.
Reinstall the column and restore normal operation conditions.
Replacing the inlet flow module
Replacing the cool on-column inlet flow module is similar to replacing a
split/splitless inlet flow module. See “Replacing the inlet flow module” on
page 124.
Leak testing the gas plumbing
Leaks in the gas plumbing system can affect chromatographic results
dramatically. The following procedure checks the flow system up to but not
including the inlet flow manifold. If this portion of the system proves to be
leak-free, refer to the next procedure to leak-check the inlet and inlet manifold.
Caution Liquid leak detectors are not recommended, especially in areas where
cleanliness is very important. If you do use leak detection fluid, immediately
rinse the fluid off to remove the soapy film.
Tools
• Electronic leak detector capable of detecting your gas type or liquid leak
detection fluid. If you use leak detection fluid, remove excess fluid when
you have completed the test.
• Two 7/16-inch wrenches
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