5 of 20
Jun 2001
Mainframe
Agilent 6890 Gas Chromatograph Service Manual
Oven and Temperature Control 420
Cryo valve installation/replacement
Cryo valve installation/replacement
A cryogenic valve allows liquid nitrogen or CO
2
to be dispersed in between
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. Re move th e k noc kou t on th e l ef t s id e o f t he ins tr u men t. Us e a sc rew dr iver
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.
To Next Page
Loading...
Need help?
General
