240 Programmed Temperature Vaporization Inlet (PTV)
Diagnostics
38 of 46
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Diagnostics
Cryo timeout—When a run does not start within a specified time after the
oven equilibrates, cryo timeout occurs and the inlet temperature shuts down.
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 timeout 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:
The inlet heater is monitored to avoid overheating. 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:
To recover from either condition, turn the GC off, then on, or enter a new
setpoint.
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