The advantages of bimetal thermometers are fast response speed, small size, good linearity, more stable, and some foreign products also have high temperature performance.
The size of the thermoelectric potential of a bimetallic thermometer is only related to the thermoelectric properties of the thermal electrode material and the temperature difference between the two ends.
Using the same homogeneous conductor or semiconductor to form a circuit will not generate a thermoelectric potential.
The temperature of the two contacts of the thermocouple is T,T0. If T=T0, the thermoelectric potential of the thermocouple is zero. The law of intermediate temperature lays the foundation for the formulation of thermocouple index meter. For many years, scientists have tried to study whether it is possible to use functional relations or even piecewise functions to express the relationship between the temperature at the hot end (measuring end) of a thermocouple and the thermoelectric potential generated by the thermocouple circuit, but have failed.
If two conductors A, B and the third conductor respectively composed of thermoelectricity have a wide temperature measurement range, long-term use of physical and chemical properties are stable
high conductivity, small resistance temperature coefficient; ※ The configured thermoelectric potential has high sensitivity, linear between thermoelectric potential and temperature, easy to copy, simple process and cheap price.