The principle of measurement of the pressure type thermometer

Pressure type thermometer is according to in closed containers liquid, gas or low boiling point liquid and saturated steam, thermal volume expansion and pressure changes after this principle and production, to measure the change in pressure, and temperature can be measured. The following instrument detailed to introduce the pressure type thermometer. Pressure type thermometer mainly consists of three parts: 1. Bulb & ndash; — Bulb is directly with contact to feel the temperature change of measured medium components, so it has high strength, small expansion coefficient, high thermal conductivity and corrosion resistant properties, according to the working medium filling and different measured medium, temperature, package available copper alloy, steel or stainless steel to make. 2. Capillary & ndash; — It is made of materials such as copper or steel cold pulling into seamless tube, used to pass the pressure change. 3. Spring tube & ndash; — It is a kind of elastic element. Pressure type thermometer is a kind of industrial use instrument, characteristics are as follows: 1. Suitable for measuring - The temperature of 80 ~ 600 ℃, the general accuracy of & plusmn; 2%. 2. Measuring temperature at a distance. 3. Shockproof structure can make it, do not need power supply. The classification of the pressure type thermometer: 1. Liquid pressure gauge thermometer. 2. Gas pressure gauge thermometer. 3. Steam pressure gauge thermometer thermometer casing diameter is 60100150 mm usually three before installation is usually flange, flange and stent after installation.