The working principle of single magnet surface thermometer

Single magnet surface thermometer is a member of the bimetallic thermometer, is the use of the principle of heat bilges cold shrink bimetallic strip made, working principle 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. This type of surface thermometer is different from the usual sheath maerial of bimetallic thermometer, it is to rely on the magnet adsorption on the adsorption of metal material, such as iron, again through the back to indicate that the temperature of the thermal probe. The usual way is: the single magnet adsorption on the surface of the measured medium that clean surface thermometer, reaction time, wait for 15 minutes at this time, the temperature of the dial indicator on is the surface temperature of the measured medium. If you want to know precisely piping within the medium temperature, still need to use the sheath maerial of bimetallic thermometer.