Bimetal temperature sensor structure

Bimetallic temperature sensor is the use of a bimetal made ​​of a temperature characteristic of temperature sensors, such as cold start timer switch, which consists of housing, bimetal, heating coils, contacts and the like.
Cold start time switch is a temperature-time switch with threaded connections installed at the outlet of the engine, in order to detect the engine coolant temperature. This switch has a normally closed contact inside its movable arm by a pair of sheet metal. Bimetal Crank Shaft Sensor expansion coefficient from the two different pieces of metal bonded, as the temperature changes, the two thermal expansion difference between the metal sheet, the temperature is low, the bimetal to maintain the original state; temperature rises to a certain extent when the bimetal to the low thermal expansion coefficient of the metal sheet is bent. Bimetal around which two heating coils, heating the bimetal can bend, so the contacts open. Warm up the engine to a certain temperature, the original closed contact should be disconnected.