NTC thermistor Principle


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NTC (Negative Temperature Coeff1Cient) refers to the reduced resistivity exponential relationship, with a temperature rise phenomenon and material having a negative temperature coefficient thermistor. The material is sufficiently mixed with manganese, copper, silicon, cobalt, iron, nickel, zinc, and the like of two or more metal oxides, molding and sintering process is made of a semiconductor ceramic having a negative temperature coefficient, can be made (NTC) thermistor. Its resistivity and material constants with the material composition ratio, sintering atmosphere, sintering temperature, and the structural state varies. Now also appears to the silicon carbide, selenium, tin, tantalum nitride, etc. as the representative of the non-oxide-based NTC thermistor material.

The NTC thermistor experienced long stage. 1834, the first time scientists have found that the characteristics of the negative temperature coefficient of silver sulfide. In 1930, scientists found that the cuprous oxide - copper oxide has a negative temperature coefficient of performance and the success of the use of in aviation instrument temperature compensation circuit. Subsequently, due to the continuous development of transistor technology, thermistor made significant progress. Developed in 1960 the NTC thermistor, widely used for temperature measurement, temperature control, temperature compensation.

Measuring it is generally in the range of -10 to +300 ° C and -200 to +10 ° C, can also be done.

The thermistor thermometer accuracy can reach 0.1 ° C temperature sensing less time to 10s. It is not only applicable to the granary thermometer, also can be used in food storage, medicine and health, scientific farming, marine, deep wells, high-altitude, glacier temperature measurement.(Metal Oxide Varistor)