Understand the capillary thermometer
The principle of capillary thermometer is based on the relationship between the saturated vapor pressure and temperature of the evaporated liquid in a closed temperature measurement system, and is used for temperature measurement. When the temperature bulb senses a temperature change, the saturated vapor in the closed system generates corresponding pressure, causing a change in the curvature of the elastic element and causing displacement at its free end. The displacement is then converted into an indicator value by a gear amplification mechanism. This thermometer has the characteristics of small temperature bulb volume, fast reaction speed, high sensitivity, and intuitive reading. It almost combines all the advantages of glass rod thermometers, bimetallic thermometers, and gas pressure thermometers. It can be manufactured as shock resistant and corrosion-resistant, and can achieve remote transmission of contact signals, thermal resistance signals, 0-10mA or 4-20mA signals. It is currently the most widely used and comprehensive mechanical temperature measuring instrument.
