Do you know the bimetallic thermometer calibration procedures

Bimetallic thermometer is one of the most commonly used a thermometer in industry, and how much you know about it again? Know how to check the bimetallic thermometer is? Today, let me make a brief introduction for you. Bimetallic thermometer with different expansion coefficient of two kinds of metal or alloy plate firmly combined together to form thermal components, generally fired into a spiral, its one end fixed and the other end with a pointer. When the temperature changes, the thermal component of curvature change, free end rotation, drive the pointer indicates the temperature value on the dial. In general, bimetallic thermometer calibration project is divided into the following five: appearance inspection, Such as calibration is complete and clear, whether connection parts is strong, etc. ) , check value ( Poor based error should be no greater than allowed) , back to the poor ( No more than allow basic error absolute value) , repetitive inspection ( Error is not more than half the fundamental error absolute value allowed) And stability checking ( The thermometer in the measurement after the prescribed time limit, its error is no more than allow basic value) 。 Among them, repetitive check and stability check only for the new product to the factory checking. Do you understand?