Kriorezistivnyy metod kontrolya urovnya zhidkogo azota v kriogennykh rezervuarakh

The enhancement of economic efficiency of the use of the capacitive cryogenic equipment is reached thanks to the increase of its unit volume and turnover. But the requirements to accuracy of the control of the charge level of large vessels with cryoagents increase too. The control of the liquid level in the vessels is one of the main functions of the control system that directly influences their safety. Modern level sensors may be mechanical, hydrostatic, conductometric, acoustic, radioactive, capacitive, thermoelectric and thermoresistive according to their operation principle. Thermoresistive sensors are the most reliable and sensitive. The modern development of technology of composite high temperatures superconductors (HTSC) gives the possibility to use them for creation of sensors of level measurement of cryogenic liquids. The article deals with development and investigation of a thermoresistive sensor that is simple, convenient, has low heat inflows to cryoagent, that possesses good metrological, inertial and economic indices based on high temperature superconductors. The results of modeling of heat exchange of HTSC with liquid nitrogen, operation characteristics of HTSC as well as the data of tests of a prototype model of a liquid nitrogen level gauge are cited. Keywords: method of control of cryogenic liquids level, thermoresistive sensor, high temperature superconductor.

метод контроля уровня криогенных жидкостей, терморезистивный датчик, высокотемпературный сверхпроводник