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Jun 2001
Mainframe
Agilent 6890 Gas Chromatograph Service Manual
Oven and Temperature Control 420
Cryo valve installation/replacement
Replacing an existing 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.
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. Shut off the cryo fluid supply and crack the valve at the supply to release
any residual pressure.
3. Use a 9/16-inch wrench to disconnect the cryogenic fluid supply tube at
the cryo valve.
4. Disconnect the cryo valve’s wiring harness from the connector to the left
of the valve (see Figure 420-1).
5. Remove the two Torx T-20 screws holding the old cryo valve and pull it
straight out from the instrument (see Figure 420-1).
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