PURPOSE: To obtain a compact corrosion-environment determining apparatus having the excellent measuring accuracy and sensitivity, which can used in fluorocarbon liquid that is used as high electric insulating refrigerant.
CONSTITUTION: A sensor 1 for high electric insulating refrigerant has a sensor, wherein minute electrodes are arranged on a semiconductor substrate in the circulating path of the high electric insulating refrigerant of electric and electronic parts, and a circuit, wherein the impedance of the electrode system caused by the change in environment is measured with the sensor and the quantity of the corrosion environment is determined. Therefore, the corrosion and the damage of the metallic material in the high electric insulating refrigerant 7 and the quality of the refrigerant can be readily determined in high accuracy and in high sensitivity.
HATSUDA TOSHIO
KASAI KENICHI
