The basic knowledge of pressure type thermometer must know

Pressure gauge 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. Pressure gauge 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 generally use the elastic element of pressure gauges. Pressure gauge thermometer is an instrument of industrial use, characteristics are as follows: ( 1) Suitable for measuring temperature of 0 ~ 300 ℃, allowing the basic error is less than 1. 5 ℅ or 2. 5℅。 （ 2) Used as the instruction, record, and it's easy to make temperature annunciator and temperature regulator. （ 3) Measuring temperature at a distance. （ 4) Simple structure, the price is cheap. （ 5) Not afraid of vibration, can need not power. （ 6) Far away, the instrument of hysteresis is bigger. The classification of the pressure gauge thermometer: ( A) Liquid pressure gauge thermometer ( 2) Gas pressure gauge thermometer ( 3) Error analysis of steam pressure gauge thermometer pressure gauge thermometer pressure gauge thermometer in addition because the size is not accurate, in manufacturing transmission clearance and friction will cause error, some of the following factors can also cause error. （ 1) The influence of heat partial immersion depth; （ 2) The influence of environmental temperature; （ 3) The influence of liquid column height. That is some common sense about pressure type thermometer, know the common sense, hope will later selection pressure type thermometer bring help to you!