A thermistor is a type of sensor resistor whose resistance value changes with temperature. According to different temperature coefficients, they are divided into positive temperature coefficient thermistors (PTC thermistors) and negative temperature coefficient thermistors (NTC thermistors). The resistance value of positive temperature coefficient thermistors increases with the increase of temperature, while the resistance value of negative temperature coefficient thermistors decreases with the increase of temperature. They both belong to semiconductor devices. The main characteristics of thermistors are: ① high sensitivity, with a temperature coefficient of resistance 10 to 100 times greater than that of metals, and the ability to detect temperature changes of 10 to 6 ℃; ② Wide working temperature range, suitable for normal temperature devices ranging from -55 ℃ to 315 ℃, high temperature devices suitable for temperatures above 315 ℃ (currently up to 2000 ℃), and low temperature devices suitable for temperatures ranging from -273 ℃ to -55 ℃; ③ Small size, able to measure the temperature of gaps, cavities, and blood vessels in organisms that cannot be measured by other thermometers; ④ Convenient to use, the resistance value can be arbitrarily selected between 0.1~100k Ω; ⑤ Easy to process into complex shapes, capable of mass production; ⑥ Good stability and strong overload capacity
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