NTC thermosensitive material

　　Thermal sensitive materials can generally be divided into three categories: semiconductor, metal and alloy, which are briefly described as follows.

　　Semiconductor thermistor materials:

　　Such materials include single crystal semiconductor, polycrystalline semiconductor, glass semiconductor, organic semiconductor and metal oxide. They all have very large resistance temperature coefficient and high tortoise resistance rate, and the sensitivity of the sensor made of them is also quite high.

　　According to the resistance temperature coefficient, it can also be divided into negative resistance temperature coefficient materials and positive resistance temperature coefficient materials In a limited temperature range, the negative resistance temperature coefficient material a can reach - 6 * 10-2/℃, and the positive resistance temperature coefficient material a can reach above - 60 * 10-2/℃.

　　For example, barium carbonate ceramic is an ideal semiconductor material with positive resistance temperature coefficient. The above two materials are widely used in temperature measurement, temperature control, temperature compensation, switching circuit, overload protection and time delay.

　　For example, thermistor thermometer, thermistor switch and thermistor thermometer, thermistor switch and thermistor delay relay error are respectively made with sub. Due to the exponential relationship between resistance and mobility, this kind of material has narrow temperature measurement range and poor uniformity.

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