148 Operation Manual
10 Configuration
If the inlet is to be cooled during a run, cryogen will be
used to achieve the setpoint. This may have a negative
impact on the chromatographic performance of the oven and
cause distorted peaks.
Cryo timeout Use this setting to conserve cryogenic fluid. If
selected, the instrument shuts down the inlet and cryogenic
(subambient) cooling (if installed) when no run starts in the
number of minutes specified. The setpoint range is 2 to 120
minutes (default 30 minutes). Turning cryo timeout off
disables this feature. We recommend cryo timeout enabling
to conserve coolant at the end of a sequence or if
automation fails. A Post Sequence method could also be
used.
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 a 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 a
message.
To recover from either condition, turn the GC off, then on,
or enter a new setpoint.
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