Remote thermal monitoring of several locations - uses alternative thermal resistors which switch into branch of resistive bridge

摘要

An electronic remote temperature monitoring system is described which has a number of thermally variable resistance devices located at the various points of interest at which it is desired to monitor temperature. Each thermal resistance (TRD) is associated with a pair of conductors (1, 2). Each of the thermal resistances with respective conductors forms one branch of a resistive measuring bridge (R1 - R3). Te bridge enables a galvanometer to provide temperature readings at the various locations of interest by switching in the alternative thermal resistors.