The chemistry department's helium recovery system at Texas A&M University in College Station, TX uses two types of custom boxes to monitor the helium gas and the low-pressure storage bag.
The helium recovery facility at Texas A&M chemistry uses custom made sensor boxes to monitor the helium gas; and, in certain cases, control actuated valves. HOT is Humidity Oxygen Temperature. More details may be found here.
The helium recovery facility at Texas A&M chemistry uses a custom made sensor box to monitor the height of the 900 cubic foot gas bag and actuate the compressor in the basement. More details may be found here.