User guide

28 Advanced User Guide
2 Configuration
6
Scroll to Slow oven cool down mode. Press [On/Yes] to run the
oven fan at reduced speed during cool down, or [Off/No] to
run it at normal speed.
To configure the oven for cryogenic cooling
All cryogenic setpoints are in the [Config][Oven] parameter list.
Cryo [ON] enables cryogenic cooling, [OFF] disables it.
Quick cryo cool This feature is separate from Cryo. Quick cryo
cool makes the oven cool faster after a run than it would
without assistance. This feature is useful when maximum
sample throughput is necessary, however it does use more
coolant. Quick cryo cool turns off soon after the oven reaches its
setpoint and Cryo takes over, if needed.
Ambient temp The temperature in the laboratory. This setpoint
determines the temperature at which cryogenic cooling is
enabled:
• 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.
The COC and PTV inlets must use the same cryo type as
configured for the oven.