American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 66)

52
Operation
Menu Reference
4.3.9.4 Pre-Cool Time
The pre-cool time menu specifies the venting period at the
beginning of each auto-fill cycle in the pre-cool mode. The vent
valve connected to AC Output 2 remains open for the specified
time, before the fill valve connected to AC Output 1 is opened to fill
the controlled dewar.
The pre-cool time may be set to up to 9,999.9 minutes. The default
value is 2.0 minutes. A value of 0.0 minutes is not allowed.
Caution
Since it is possible (and typically preferred) that cryogen will flow
through the transfer line and out the vent before the expiration of the
pre-cool time, the user is responsible for ensuring that any cryogen
output through the vent line is safely routed to prevent injury.
Pre-Cool Time:
2.0 min