Bimetallic strip how to create a bimetallic thermometer?

Bimetallic thermometer is a kind of measurement in the field of low temperature test instrument. Bimetallic thermometer can be directly measured in the process of various production - 80 ℃ ~ + 500 ℃ within the scope of liquid, steam and gas medium temperature. How those sheet metal manufacture bimetallic thermometer? Let's find out! Bimetallic thermometer temperature sensing element is bimetallic strip, thermal sensitive element according to the different temperature and after the test, can accurate temperature indicating. Bimetallic thermometer is a round shape into threaded heat bimetallic strip as thermal devices, and put it in a protective sleeve tube, one end is fixed, known as the fixed end, the other end of the connection on a thin shaft, called the free end. Spool at the free end is equipped with a pointer. When the temperature changes, the resulting thermal devices the free end of the rotation, drive the thin axis from the Angle of the pointer changes, corresponding temperature indicator on the dial. Select appropriate length to produce bimetallic thermometer, bimetallic strip, one end is fixed at the bottom of the dial, bimetallic strip surface should be parallel to the plane of a hair. Will the free end of the balance spring ( Prior to that end of the coil welding together) At the end of the bimetallic strip welding. Bimetallic strip bending degree have corresponding relationship with temperature, which can be used to indicate that the bending degree of bimetallic strip temperature. Typically, small expansion coefficient in the bimetallic strip layer called the passive layer, called big expansion coefficient of a layer of active layer.