The principle of pressure type thermometer is analysed

Pressure type thermometer is based on the sealing temperature measuring system and saturated vapor pressure of liquid evaporation temperature, the change of the relationship between the thermometer for temperature measurement. Then the principle by which it? Let's see!

although pressure type thermometer belongs to expand thermometer, but it is not by the volume of material thermal expansion after reflect changes or changes in temperature, but a liquid or gas is heated in an airtight container in the back pressure increases reflect the temperature being measured, so this thermometer indicating instrument is actually common pressure gauge. The main characteristic of pressure thermometer is of simple structure, high strength, good vibration resistance.

pressure gauge thermometer is according to in closed containers of 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.

it is mainly composed of bulb, capillary and pressure sensitive element ( Such as spring tubes, bellows, bellows, etc. ) Composition, as shown. Bulb, capillary and spring tube which the inner cavity of a closed container, which is full of substance. Bulb direct contact with the measured medium, it should be fully passed to the temperature changes within working substance. So, its material should have anticorrosive ability, and good thermal conductivity. Package itself in order to improve the sensitivity, temperature of heat expansion should be far less than the expansion of its internal work material, so the material body expansion coefficient is smaller.

in addition, also should have enough mechanical strength, so that the vessel with thin wall under high pressure difference inside and outside. Usually, made of stainless steel or brass bulb, brass can only be used in the corrosive medium. After the bulb is heated, will make internal work material temperature and pressure, the pressure by the capillary to spring tube, spring tube to produce deformation, and driven by the transmission system pointer, indicating the corresponding temperature value.

the current production of pressure thermometer according to different work within the material filling the closed system can be divided into filling gas pressure and steam pressure thermometer thermometer.

pressure type thermometer most afraid of is slightly leaking, after completion of production must be through the micro leak detection, pressure type thermometer are domestic product through the quiet place for a period of time to check the micro leakage, can use the auxiliary instrument, of course, that testing instruments are relatively expensive.

that is to introduce the content about the pressure type thermometer, thank you in spite of being very busy toglance check my company information, if you want to know more, you are welcome to call for consultation!