Views: 11 Author: Site Editor Publish Time: 2020-07-07 Origin: Site
The bimetal thermometer combines two metals with different linear expansion coefficients, and one end is fixed. When the temperature changes, the two metals have different thermal expansions, driving the pointer to deflect to indicate the temperature. This is a bimetal thermometer. The temperature measurement range is -80~600C, which is suitable for temperature measurement when the accuracy requirement in the industry is not high. As a temperature sensing element, the bimetallic sheet can also be used for automatic temperature control.
The bimetal thermometer uses a hot bimetallic piece wound into a spiral shape as a temperature sensing device, and installs it in a protective sleeve, one end of which is fixed, called the fixed end, and the other end is connected to a thin shaft, called Free end. A pointer is installed on the free end spool. When the temperature changes, the free end of the temperature sensing device rotates accordingly, driving the pointer on the thin shaft to produce an angle change, indicating the corresponding temperature on the dial.
The advantages of the bimetal thermometer are fast response, small size, good linearity, and stability. Some foreign products also have high temperature performance. The thermoelectric potential of the bimetal thermometer is only related to the thermoelectric properties of the thermode material and the temperature difference between the two ends. . Using the same kind of homogeneous conductor or semiconductor to form a loop will not generate thermoelectric potential.
If the two conductors A, B and the third conductor respectively constitute a thermoelectricity with a wide temperature measurement range, the physical and chemical properties for long-term use are stable, high conductivity, small resistance temperature coefficient, high configuration thermoelectric sensitivity, high thermoelectric potential and temperature It is linear, easy to copy, simple in process and cheap in price. Generally, bimetallic thermometers are used at low temperatures, and thermocouples are used at high temperatures, which may affect the measurement results, and even the measurement results may not come out.