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Electronic temperature controller (electronic temperature controller) is measured by resistive temperature sensing method. In general, platinum wire, copper wire, tungsten wire and semiconductor (thermistor, etc.) are used as temperature sensing resistance, and each of these resistances has its own optimal point.

The thermistor thermostat is based on the principle of the wheatstone bridge, which is the wheatstone bridge. Power supply E is connected to both ends of BD. According to kirchhoff's law, when the resistance of the bridge R1 x R4=R2 x R3, the potential of A and C is equal. There is no current flowing between the output end A and C. Therefore, when the thermostat is built, it is easy to change the temperature range and operating temperature by selecting the appropriate thermistor.

Electronic thermostat is mainly used for temperature control of electric heating and water heating, which has the features of convenient operation and high control accuracy.