Bimetallic chip temperature sensor is the use of bimetal temperature characteristics made of a temperature sensor (temperature switch),Such as cold start timer switch,It consists of shell, bimetallic, heating coil, contact and so on. The cold start timer switch is a temperature-time switch,With a threaded connection, installed in the engine outlet,To detect the engine water temperature.This switch has a normally closed contact,Movable arm which is made of a bimetal.The bimetallic sheet is made of two pieces of metal sheet having different coefficients of thermal expansion,With the temperature changes,Two metal pieces produce thermal expansion difference, When the temperature is low,Bimetallic sheet to maintain its original state;When the temperature rises to a certain extent,The bimetal is bent toward the side of the sheet having a low coefficient of expansion.There are two heating coils around the bimetallic sheet,After heating, the bimetallic sheet can be bent,Thereby disconnecting the contacts.After the engine warms up to a certain temperature,The original closed contact should be disconnected.