Bimetallic thermometer principle of double metal sensors

Bimetallic thermometer schematic diagram of the double metal sensors: principle of bimetallic thermometer is according to the principle of thermal expansion of bimetallic strip temperature measurement, belong to solid expansion thermometer. Bimetallic thermometer based on solid heat expansion principle, measuring temperature is usually put the two pieces of expansion coefficient difference is relatively large pieces of metal stitch welding together, constitute a bimetallic temperature sensing element. When the temperature changes, because the bimetallic strip of the materials of the two different linear expansion coefficient is relatively large, produce different expansion and contraction, leading to the curving deformation of bimetallic strip. As there are different according to different deformation amount of momentum transfer, the amount of rotation drive connection shaft, shaft drive at the other end of the indicating needle, indicating pointer is just on the correct reading, indicate the temperature. 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) 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.