The Column Oven
Cryogenic operation
98
• Ambient temp + 25°C, for regular cryo operation
• Ambient temp + 45°C, for Quick Cryo Cool.
Cryo timeout Cryo timeout occurs, and the oven shuts off, when a run does
not start within a specified time (10 to 120 minutes) after the oven equilibrates.
Turning cryo timeout off disables this feature. We recommend that it be turned
on because cryo timeout conserves coolant at the end of a sequence or if
automation fails.
Cryo fault Shuts the oven down if it does not reach setpoint temperature
after 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. For
example, with a cool on-column inlet and cryo control in the oven track mode,
it may take the oven 20 to 30 minutes to achieve readiness.
If the temperature goes below the minimum allowed temperature (–90°C for
liquid nitrogen,–70°C for liquid CO
2
), the oven will shut down with the following
display:
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