...
Check each Liquerfier screens (A & B) at least once per hour. A sample operational screen is below.
The main components to check on the Liquefier screens are below:
1) Mode (top left): Should be Run + Auto + Liquefy mode if it's in the production mode
2) Cold head temperatures: Should be around > 3 Kelvin.
3) Make sure the Liquefier is producing LHe and the Dewar level keeps increasing (~4L/hr in average)
If you start seeing large frequent fluctuations (similar to the following image), then .
It may be an indication that the Dewar level sensor tubes are contaminated. Please contact the Target Expert on shift immediately.
Procedure for cleaning the tubes: https://seaquest-docdb.fnal.gov/cgi-bin/sso/ShowDocument?docid=10401
4) Make sure FC501(A/B)I (actual inlet gHe flow) is close to FC501(A/B)Q (gHe set-flow from PID) (see "Settings" screen to check the set values)
5) Make sure FC(A/B)I (actual outlet gHe flow) is close to FC(A/B)Q (gHe outlet set-flow from PID) (see "Settings" screen to check the set values)
...