Single magnet surface thermometer is double metal thermometer?

Single magnet surface thermometer is an instrument to measure the surface temperature, for behind it are named a large magnet. The single magnet surface thermometer is belong to bimetallic thermometer? In fact, to determine whether the surface temperature of single magnet belongs to the bimetallic thermometer, can from the point of view how it works. Single magnet on the surface of the working principle of the thermometer is based on the principle of solid heat expansion, the two pieces of expansion coefficient difference is very big pieces of metal welded together. When the temperature changes, the difference is very big, caused the different expansion coefficient of expansion and contraction, the deformation of sheet metal bending. According to different deformation and produce different momentum, momentum to drive the connection shaft and the other end of the indicating needle, indicate the temperature. Thus, single magnet surface thermometer is a member of the bimetallic thermometer, its appearance and generally large difference of the bimetallic thermometer, only because of its thermal element structure is different from general bimetallic thermometer. Using single magnet surface thermometer is, remember to put it adsorbed on the surface of the measured medium that clean, reaction time, wait for 15 minutes this time as the temperature dial indicator on the surface of the measured medium temperature.