Diaphragm and Bellows type differential pressure instruments calibrated in weight or volume are used in cryogenic tank level measurement. Tanks can be stationery (vertical or horizontal) or they can be used in tanker transport vehicles. Most cryogenic instrumentation utilizes a “dry gauge” design where there is no internal liquid fill. This prevents any leaking or fouling of the tank system, along with no damage or accuracy issues due to liquid-fill expansion when the tank is exposed to temperature shocks in cryogenic applications.
Usually, instruments used in cryogenic applications are cleaned for oxygen service.
Dials can be custom produced to show LIN/LOX/LOR, Inches H2O, mm H2O, cm H2O and Co2, just to name a few.
Many cryogenic tank level measurement instruments also offer switch outputs for remote alarms or 4-20 ma signal outputs for remote readout.