December 20, 2022
Thermistors can also be used as electronic circuit components for instrument circuit temperature compensation and thermocouple cold junction temperature compensation. The self heating characteristic of NTC thermistor can be used to realize automatic gain control, which constitutes the amplitude stabilizing circuit, delay circuit and protection circuit of RC oscillator. When the self heating temperature is much higher than the ambient temperature, the resistance value is also related to the heat dissipation conditions of the environment. Therefore, the characteristic of thermistor is often used in the flow meter, flowmeter, gas analyzer, and thermal conductivity analysis to make special detection elements. PTC thermistor is mainly used for overheating protection of electrical equipment, contactless relay, constant temperature, automatic gain control, motor startup, time delay, automatic degaussing of color TV, fire alarm, temperature compensation, etc.