Patent ID: 8225653

Claim:
A filling level detector for cryogenic liquids which are located in a container, which filling level detector comprises a probe immersed in a cryogenic liquid, the probe is guided on a guide which is mounted in an interior of a container, wherein the guide passes through the cryogenic liquid at at least two points in the container, an electronics part having a superconducting line section, a heating apparatus extending over the length of the probe, and means for measuring the voltage drop in the superconducting line section as a measure of the liquid level, the probe comprises a flat conductor which comprises a plurality of conductors which are routed parallel in a plastic matrix, the plurality of conductors comprise: (a) a first conductor in the form of a superconductor with a suitable selected critical temperature, the superconductor forms at least two measurement sections; (b) at least one pair of second conductors to supply heating current to the first conductor; and (c) at least one pair of third conductors used for voltage measurement, wherein the plurality of conductors are connected to points which are at a distance from one another in a longitudinal direction of the probe, and the plastic matrix of the flat conductor has stiffening ribs which run in the longitudinal direction.