The working principle of bimetallic thermometer temperature sensing element is what?1

Bimetallic thermometer is a kind of field detection instrument suitable for the measurement of low temperature, and can be used to directly measure the temperature of the gas, liquid and steam. Bimetallic thermometer is waterproof, anti-corrosion, explosion-proof, resistant to vibration, intuitive, strong and durable, and so on characteristics, can be used instead of other measuring instrument. Widely used in petroleum, chemical, machinery, ships, power generation and so on industry. The bimetallic thermometer works by using two different temperature expansion coefficient of metal, welding at one point at one end, on the other side when the temperature distortion, converted to a pointer deflection Angle. Core pulling type refers to bimetal thermal element can change from the external protecting tube, is the most widely used field indicating thermometers. Integration of bimetal thermal resistance and electric contact thermometer integrated core-pulling protection type bimetal thermal resistance thermometer and transducer, on the basis of the bimetallic thermometer is in the casing, at the same time parallel loading armored thermal resistance of a meter. Using this table can see the sign value of cleaning, can signal to the control room. Bimetallic thermometer is both use value and economic value.