Cryo Valve Installation/Replacement; Installing A New Cryo Valve - Agilent Technologies 6890 Series Service Manual

Cryo valve installation/replacement

A cryogenic valve allows liquid nitrogen or CO
the double-walled plenum of the GC oven where the fan blows the vapors into
the oven itself. Follow the procedures below to install a new cryogenic valve
or to replace an existing cryogenic valve or nozzle.

Installing a new cryo valve

WARNING Before proceeding, turn off the oven and let it and any heated zones cool
down. Turn off the main power switch and unplug the power cord.
1. Remove the left side cover on the instrument and remove the plug for the
cryo valve.
If a manual inlet carrier is installed on the left side of the instrument,
remove its left cover by removing the two bottom thumb screws, sliding
the panel towards the back of the instrument and lifting it off.
2. Remove the knockout on the left side of the instrument. Use a screwdriver
to pry it out.
3. Insert the cryogenic valve probe though the insulation into the oven
plenum.
4. Screw the valve to the side of the GC oven using the two Torx T-20 screws
provided.
Jun 2001
Cryo valve installation/replacement
Mainframe
Agilent 6890 Gas Chromatograph Service Manual
Oven and Temperature Control
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