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Cryo fault
Shuts down the inlet temperature if it does not
reach setpoint in 16 minutes of continuous cryo
operation. Note that this is the time to reach the
setpoint, not the time to stabilize and become
ready at the setpoint.
Shutdown behavior
Both Cryo time-out and Cryo fault can cause cryo
shutdown. If this happens, the inlet heater is
turned off and the cryo valve closes. The GC
beeps and displays this message:
Front Inlet Cryo Shutdown
The inlet heater is monitored to avoid overheat-
ing. If the heater remains on at full power for
more than 2 minutes, the heater is shut down.
The GC beeps and displays this message:
Released: April 2004
Front inlet heating too
slowly; temperature shut off.
To recover from either condition, turn the GC off,
then on, or enter a new setpoint.
Leak testing
Preparation
1. Cool the column to ambient, and cool inlets
2. Remove the column from the inlet fitting on
3. If a septum head is installed, and the quality
6850 Series Gas Chromatograph Service Procedures
to below 75°C to avoid damage to deacti-
vated glass liners.
the inside of the oven.
of the septum (or microseal) and Graphpack-
3D ferrule on the glass liner are unknown,
replace them now.
115
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