When need to use single magnet surface thermometer

The working principle of single magnet surface temperature 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. Single magnet surface thermometer is a kind of bimetallic thermometer. It is mainly used to measure the surface temperature of the measured medium, so it is also called the surface thermometer. When used, the surface of single magnet thermometer adsorption on the surface of the measured medium, waiting for a certain reaction time, the temperature of the indicator on the dial is the surface temperature of the measured medium. Using single magnet thermometer is must pay attention to two questions: 1. The measured medium surface must be clean without impurities, otherwise it will affect the rate of heat conduction, so that the temperature display is not accurate. 2. Generally for 15 minutes, the reaction time is less than 15 minutes, single magnet thermometer temperature is not stable, then measured temperature is not accurate.