HONGQI INSTRUMENT (CHANGXING) CO.,LTD CHINA

Pressure gauge industry experts, the biggest pressure gauge manufacturers in China

E-mail: hongqi@cnhongqi.com
Home > EXHIBITION > Content
Common types of pressure gauges
- Jun 01, 2018 -

Pressure gauge with bourdon tube: the sensitive element of bourdon tube is curved into a circle.

Elastic C - shaped tube with oval sectional area. The pressure of the measuring medium ACTS on the inside of the wave tube, so that the elliptical section of the wave tube tends to the circular section. Due to the slight deformation of the bourdon tube, a certain ring stress is formed. The stress of this ring will extend the bourdon tube outwards. Because the head of the elastic bourdon tube is not fixed, it will produce small deformation, and its deformation depends on the pressure of the measuring medium. The deformation of the bourdon tube is shown indirectly by the pointer through the core to measure the pressure of the medium.

Bellows pressure gauge: the bellows sensing element consists of two circular, wavy membranes connected together. The pressure of the measuring medium ACTS on the inside of the box cavity, and the resulting deformation can be used to measure the pressure of the medium indirectly. The pressure value is displayed by the pointer. The pressure gauge of the film box is generally used to measure the pressure of the gas, and it can measure the micro-pressure and overpressure protection to a certain extent. When several membrane box sensitive elements are stacked together, a large transfer force is generated to measure extremely small pressure.

Explosion-proof pressure gauge: explosion-proof pressure gauge is suitable for use in flammable and explosive occasions, it's different from ordinary pressure gauge, explosion-proof pressure gauge of the more demanding, the first is high safety coefficient is not high, many different kinds of explosion-proof pressure gauge, how to choose the suitable pressure gauge, the overall consideration. Explosion-proof pressure gauges are classified by explosion-proof coefficient: this safety explosion-proof pressure gauge and explosion-proof pressure gauge. Safety performance: electric contact pressure gauges, pointer type pressure gauges, digital display pressure gauges.

Explosion-proof electric contact pressure gauge: explosion-proof electric contact pressure gauge of flame-proof shell has the good explosion-proof performance, therefore the explosion-proof electric contact pressure gauge in normal work process because of the influence of the sparks or electric arc, in addition to shell under internal explosive gas mixtures at once an explosion caused by the explosion pressure, and can effectively prevent the resulting heat well spread outward, but only inside the shell along the flame-proof tiny cracks in the joint surface slowly spread outward. At this point, the instantaneous temperature transmitted to the outside of the shell has been lowered below the ignition temperature of the explosive gas mixture, so it will not lead to explosion transmission.

Explosion-proof digital (pointer) pressure gauge: high precision, high stability, less than 1% error, internal power supply, micro power consumption, stainless steel shell, strong protection, beautiful and delicate. Explosion-proof digital pressure gauges are widely used to measure the pressure of various fluid media with explosion hazards in petroleum, chemical industry, metallurgy, power stations and other industrial sectors or in electromechanical equipment.

Vacuum pressure gauges: vacuum pressure gauges are used to measure pressure or negative pressure on steel, copper and copper alloys without corrosion, non-crystallization without explosion hazards, non-solidified liquids, gases or steam media. Shock-resistant vacuum pressure gauges are used to measure the negative pressure of non-corrosive, non-crystalline media when vibration and pressure fluctuate. Electric contact pressure vacuum gauge and electric contact vacuum gauge used for copper and copper alloy non-corrosive effect, no explosion danger of crystals, solidification of liquid, gas and other medium (pressure) and negative pressure measurement, when the pressure to the expected value, with the aid of contact device, can connect or disconnect control circuit, at the same time send electrical signals.

Classification of vacuum pressure gauges:

A vacuum pressure gauge is an instrument used to measure pressure greater than or less than air pressure based on atmospheric pressure.

Shock-resistant vacuum pressure gauges, as a classification of shock-resistant pressure gauges, are used to measure the negative pressure of non-corrosive, non-crystalline media when vibration and pressure fluctuate.

Contact vacuum pressure gauges and contact vacuum gauges copper and copper alloys have no corrosion, no risk of explosion, amorphous unsolidified liquids, gases and other media (pressure) and negative pressure.

Stainless steel pressure vacuum gauge is used to measure the non-corrosive liquid, gas medium pressure and negative pressure of stainless steel 316,316 L and 0Crl8Ni12MO2Ti.

Acid-proof pressure vacuum gauge is used to measure the pressure and negative pressure of nitric acid and alkali liquid media. Acid-proof vacuum gauge is used to measure the negative pressure of nitric acid and alkali liquids.