Helium level meters operate with a sensor containing a superconducting wire. When a current flows through the wire, only the part immersed in Helium remains superconducting, and the value of the sensor total resistance provides the liquid level.
For all other (cryogenic) liquids, the sensor is a tubular capacitor. Since the dielectric constant of a liquid is higher than that of its vapour, a level change entails a capacitance change. The level meter measures the sensor capacitance, and calculates the corresponding liquid level.
We are working with various instrument manufacturers. Send us your level measurement requirements, and we will find a suitable solution for your needs.
We can take care of maintenance and repairs for all the American Magnetics Inc. (Oak Ridge, Tennessee, USA) instruments we have sold or for the others on request.