Thermistor sensor
A thermistor is an electronic device which utilizes the change of resistance when the temperature changes, and is widely used as a temperature sensor and a compensator for an electronic circuit. Thermistors are ceramic semiconductors which exhibit large changes in electrical resistance with corresponding changes in temperature. Thermistors have an extremely high temperature coefficient of resistance and precise resistance versus temperature characteristics. Because of their sensitivity, accuracy, and stability, thermistors are generally accepted to be the most advantageous sensor for many applications including temperature measurement, compensation, and control. Thermistors having positive temperature coefficients (PTC thermistors) as well as thermistors having negative temperature coefficients (NTC thermistors) are used. The NTC thermistor has a negative temperature coefficient and whose resistivity decreases with increasing temperature, and is applied in the form of a temperature sensor to temperature compensation elements, etc. NTC thermistors are widely being used for the purposes of temperature detection and temperature compensation. NTC thermistors used for temperature measurement and compensation are usually made from various compositions including the oxides of manganese, nickel, cobalt, copper, iron, and other metals to form a ceramic semiconductor material. The PTC thermistor has a positive temperature coefficient and whose resistivity increases sharply at a certain specific temperature. A PTC chip thermistor may be incorporated into the circuit of an electronic device so as to generate heat when an overcurrent with intensity greater than a specified level flows therethrough, thereby increasing its resistance due to its positive resistance-temperature characteristic and keeping the intensity of the current flowing into the electronic device below a certain level. The PTC thermistor is widely applied to temperature control elements, overcurrent control elements, motor-starting elements, constant-temperature heat generators, etc.
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