CASE FOR SENSOR WITH RADIO TRANSMITTER

摘要

PURPOSE:To attain the safety not in contact with a high voltage charging part by installing an antenna of a radio transmitter to the inside of an insulation protection plate of a metallic case. CONSTITUTION:A radio transmitter 5, an antenna 6 and a temperature sensor employing a sensor switch 7 made of a shape memory alloy or the like are contained in a metallic case 2. Then the antenna 6 is arranged to the inside of an insulation protection plate 4 made of a glass plate or a ceramic plate fitted to an antenna opening window 3 of the metallic case 2. Thus, even when the metallic case 2 is fitted in contact with a high voltage conductor 30 or the like, the antenna 6 is not in contact with the high voltage charging part and the danger of the transmitter 5 destroyed by a high voltage is prevented.