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.
List of DP flow manufacturers:
Other resources that might interest you
Differential pressure transmitter applied in a level measurement
Is the DP level transmitter the radar solution when implementing a DP level transmitter?
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When should you use a 3D scanner to level measurement?
Which is the best level principle – radar or pressure?
What’s the best level principle? And is it better to implement a radar instead of a pressure transmitter for level measurement?
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