Do you know the working principle of bimetallic thermometer?

Bimetallic thermometer measuring temperature range is roughly as follows: - 80 ℃ to 550 ℃, but the precision of the extremely low and high temperature is not high. The principle of the bimetallic thermometer determines the extent of the bimetallic thermometer is good, easy reading, widely applicable to various kinds of industrial production and equipment. Bimetallic thermometer principle is applied thermal expansion principle of temperature measurement, belong to solid expansion thermometer. Below, we will tell the bimetallic thermometer works. The principle diagram of the bimetallic thermometer is a ( The principle diagram of the bimetallic strip heating) See below: according to the principle of double metal thermometer, the shape of the bimetallic thermometer temperature sensing element and can be divided into planar spiral type and linear spiral type two kinds big. Bimetallic thermometer principle (figure 2 Bimetallic induction flat shape chart) According to the principle of double metal thermometer, bimetallic thermometer work structure as below: the principle diagram of the bimetallic thermometer three ( The bimetallic thermometer diagram)