The working principle of bimetallic thermometer

Bimetallic thermometer is used to be a kind of medium temperature measurement devices, widely used in the real life. Industry, petroleum, chemical industry, heating system, pipelines, power plants, Marine, etc can all see it, it is can use such a broad range, it is decided by how it works. Bimetallic thermometer temperature sensing element is composed of two layers of different linear expansion coefficient, made of sheet metal folding welding together, linear expansion coefficient of large pieces of metal is called the active layer, and the other one is called passive layer, one end of the element is fixed, the other end of the free end, when the measured temperature changes, as a result of the two layers of metal linear expansion coefficient is different, the free end by the combination of torque and bending ( Or deformation) , the change of curvature and physical properties of the bimetallic strip material, length of the thickness of each layer, temperature, and has nothing to do with the width. When temperature is designed, the bimetallic strip of material and geometry size, so the change of curvature is only related to temperature, if on the free end is equipped with drive mechanism, pointer and dial indication in temperature, so you can directly show the temperature value. Bimetallic thermometer temperature range is - yes Between 50 and 550 c.