The working principle and characteristics of pressure type thermometer

Pressure type thermometer using filling type thermal system of measuring temperature instrument. A measuring instrument for fluid pressure. Is usually measured pressure with a reference ( Such as atmospheric pressure, or other given) Comparison, thus measured is relative pressure or differential pressure.

the working principle of pressure type thermometer: based on the sealing temperature measuring system of liquid evaporation changes in the relationship between saturated vapor pressure and temperature, and temperature measurement. When bulb feel temperature, saturated vapor produced the corresponding pressure in the closed system, cause the change of curvature elastic element, make its produce a shift in the free end, again by the displacement amplification mechanism of gear into the indicated value. Pressure type thermometer with a bulb small volume, fast response, high sensitivity, reading the characteristics of intuitive, almost set the glass rod thermometer, bimetallic thermometer, gas pressure thermometer all advantages, it can be made into shock, anti-corrosion type, and can realize remote contact signals, heat resistance, 0 10 ma, or 4 20 ma signal. Is currently the most widely use scope, performance is one of the most comprehensive mechanical thermometer table. Pressure type thermometer is the use of sealed container of liquid, gas or saturated steam heated volume expansion and pressure changes as the signal. Its basic structure is made up of bulb, capillary and indicator of three parts. It is one of the earliest methods of temperature control applied in the production process. Pressure type temperature measuring system now is still on the instructions and control is widely used in the temperature measurement method.