Main Structure of Pressure Type Thermometer

Pressure type thermometer is a thermometer for temperature measurement based on the relationship between the saturated vapor pressure and temperature of the vaporized liquid in a closed temperature measurement system.

The principle of the pressure thermometer is based on the change relationship between the saturated vapor pressure and temperature of the vaporized liquid in a closed temperature measurement system, and the temperature measurement is performed. When the temperature bulb feels the temperature change, the saturated steam in the closed system produces corresponding pressure, which causes the curvature of the elastic element to change, causing the free end to produce displacement, and then the displacement is changed to the indicated value by the gear amplification mechanism. This kind of thermometer has a temperature The package is small in size, fast in response, high in sensitivity, and intuitive in readings. Pressure thermometers almost integrate all the advantages of glass rod thermometers, bimetallic thermometers, and gas pressure thermometers.

Main structure of pressure thermometer:

1. Temperature bulb: It is a component that directly contacts the measured medium to feel the temperature change, so it is required to have high strength, small expansion coefficient, high thermal conductivity and corrosion resistance. According to the different working material and measured medium, the bulb can be made of copper alloy, steel or stainless steel.
2. Capillary tube: It is a seamless round tube cold drawn from copper or steel to transmit pressure changes. The outer diameter is 1.5~5mm, and the inner diameter is 0.15~0.5mm. If its diameter is thinner and its length is longer, the hysteresis of transmission pressure is more serious. In other words, the reaction of the thermometer to the measured temperature is slower. However, under the same length, the thinner the capillary, the higher the accuracy of the meter. The capillary tube is easily broken and broken, so it must be protected. For capillary tubes that are not often bent, metal hoses can be used as protective sleeves.
3. Spring tube: it is an elastic element for general pressure gauges.

Pressure thermometer is currently the most widely used and most comprehensive mechanical temperature measuring instrument. Pressure thermometers are widely used in machinery, textile, chemical, pharmaceutical, and food industries to measure and control temperature in the production process.

Cixi Oukate Instrument Technology Co., Ltd. not only has Pressure type thermometer but also Vacuum pressure gauge and other products. Welcome to visit our official website.