HTS based 400 mm level sensor for liquid nitrogen

High Temperature Superconductor (HTS) tapes are commercially available with lowest width of 3 mm. An attempt to use these types of tapes for cryogen level sensor is discussed in this paper. The output voltage curves versus liquid level shows the linear behavior when a constant current of 1 ampere is used as an excitation in a four probe method. An attempt to develop the liquid level sensor of 400 mm of length for use in cryostat of LOX tank and the calibration of level sensor against the secondary standard (capacitance type level sensor) is presented here. The calibration was carried out using liquid Nitrogen. The superconductor type level sensor weighs less than 1 kg can be used in cryostage to reduce the payload of the flight. The continuous online data logging was done using the program developed in LabVIEW 11.0 software.