Calibration of capacitance type cryogenic liquid level sensor using discrete array type liquid level indicator

摘要

In large cryogenic storage systems, usually continuous monitoring of liquid levelis accomplished using capacitance type level indicators. To check the accuracyand linearity of such level indicators and associated electronics, it is necessary tocalibrate them against a standard and also, the cryogen has to be maintained withvery less heat transfer from ambient in order to maintain minimum bubbleformation. In this paper, we report the development of discrete array type liquidlevel indicator using diodes as level sensors which are operated usingcryogenically operated multiplexers. The cryostat system designed for 5 barpressure also is described.