User guide

30 Advanced User Guide
2 Configuration
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.