一、基本原理及典型应用线路热敏电阻器是一种电阻值随温度变化而显著变化的半导体电阻器。这种元件在温度补偿和温度测量等方面的用途,已为人们所熟悉。当热敏电阻器用于上述场合时,一般要求通过热敏电阻器的电流很小,使之处于不发热的状态下进行工作。把热敏电阻器用作液面探测(指示、报警)器时,其基本条件是:通过热敏电阻器的电流必须充分发热,这样,由于热敏电阻器在空气中与在液体中的耗散系数差别很大,只要把热 First, the basic principles and typical applications Line thermistor is a resistance value changes significantly with the temperature of semiconductor resistors. The use of such components in terms of temperature compensation and temperature measurement is well known. When a thermistor is used in the above situation, it is generally required that the current through the thermistor be small enough to operate without heating. The basic requirements for using a thermistor as a level detector are as follows: The current through the thermistor must be sufficiently heated so that, as the thermistor dissipates in air and in liquid The coefficients vary widely, as long as the heat