Cryogenic level measurement
What is the best measurement transmitter for level measurement in cryogenic tanks?.
Expert’s answer: Cryogenic level measurement
Good question about cryogenic level measurement! So, most applications hold liquids with below-freezing boiling points, such as nitrogen and methane, in thermally insulated vertical tanks. Still, the tank will always have a gas pressure head for the liquid vapor. Also, these fluids have low oxygen permeability, or Dk values, which make radar devices a poor choice.
Differential pressure transmitters can compensate for the vapor pressure head and measure the level accurately. Also, wet or dry legs with some slant will help reduce turbulence from boiling and condensing outside the insulation. If you use wet legs, then you should use liquids with low freezing points.
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