Agilent Technologies 6850 Series II User Information page 127

5.
Inlet base seal
Washer
Reducing nut
6.
Leak testing the gas plumbing
Leaks in the gas plumbing 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 check the inlet and inlet manifold.
Caution Liquid leak detectors are not recommended, especially in areas where cleanli-
ness 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, wipe off excess fluid when you
have completed the test.
Procedure
Warning To avoid a potential shock hazard when using liquid detection fluid, turn the
GC off at the main power switch on the left side and disconnect the main
power cord. Avoid spilling leak solution on electrical wiring, especially the
detector and inlet heater leads.
1.
2.
Released: March 2004
Place the washer in the reducing nut. Place the new inlet base seal on top
of it.
Replace the reducing nut and tighten with a wrench. Replace the column
and the insulation cup. After the column is installed, you can restore
normal operating conditions.
Use the leak detector to check each connection you have made for leaks.
Tighten the leaky connections. Retest the connections; continue tightening
until all connections are leak-free.
6850 Series II GC User Information
Maintaining a split/splitless inlet
Side view of
inlet base seal
Make sure
this raised portion
faces down
Routine Maintenance: Inlets
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