The principle of a pressure thermometer is based on the relationship between the saturated vapor pressure and temperature of the evaporated liquid in a closed temperature measurement system. When the temperature chamber feels the temperature change, the saturated vapor in the closed system produces the corresponding pressure, causing the change of the curvature of the elastic element, so that the free end of the displacement is displaced, and then the displacement is changed into an indication value by the gear amplification mechanism, this thermometer has the characteristics of small temperature package size, fast reaction speed, high sensitivity, intuitive reading, etc., almost all the advantages of glass rod thermometer, bimetal thermometer, gas pressure thermometer, is the most widely used, the most comprehensive performance of a mechanical temperature measuring instrument.
