The difference between vacuum gauge and ordinary pressure gauge

Vacuum pressure gauge is a kind of common measuring gauges, vacuum pressure gauge when using the environment temperature for - 40 ~ 70 ℃, relative humidity is not more than 80%, such as deviation from normal use temperature 20 ℃, the temperature must be included in the additional error. Vacuum pressure gauge features stable performance, high accuracy, response speed faster. Absolute pressure equals the atmospheric pressure + relative pressure; Vacuum = atmospheric pressure Absolute pressure; Our country legal pressure units for the Pa ( N/㎡) , known as PASCAL, referred to as 'Mr. Because the unit is too small, so it is often used to MPa (10 ^ 6 times unit Mpa) 。 Vacuum pressure gauge is by measuring system ( Including joint, spring pipe, gear transmission mechanism) And instructions ( Include Pointers, dial) , watch case parts. Its working principle is based on the elastic element - Spring pipe deformation. When the measured medium is produced by the joint into the spring tube with side displacement, the displacement with the aid of connecting rod by gear transmission mechanism of pressure transmission and amplification, the pointer indicates that the pressure on the dial. Vacuum gauge used to measure for steel, copper and copper alloy non-corrosive effect, no explosion danger of crystallize, solidify liquid, gas or steam medium pressure or negative pressure. Used in vibration and seismic vacuum pressure table under pressure fluctuate, measuring no corrosion, no crystallization of negative pressure of the medium. 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 medium (such as 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. Ordinary pressure gauge refers to elastic element as the sensitive element, measure and instructions above environment pressure meter, the widespread application, it almost throughout all of the industrial process and research fields. In the heat pipe network, oil and gas transmission, water supply, gas supply system, vehicle maintenance shop, etc can be seen everywhere. Especially in the process of industrial process control and technology measure, due to the flexibility of mechanical pressure gauge sensor has high mechanical strength and production is convenient wait for a characteristic, make the mechanical pressure gauge is widely used. By ordinary pressure gauge in the table of sensitive element ( Bourdon tubes, bellows, bellows) Elastic deformation, the pressure deformation by the transformation of movement in table to Pointers, cause the hands to display the pressure. General type pressure gauge: general type pressure gauge used to measure not explode, crystallize, solidify in copper and copper alloy non-corrosive effect of the liquid, gas or steam pressure; Ordinary pressure gauge bourdon tube sensitive element is bent into a circular, elliptical section of c-shaped elastic tube. Measurement in wave tube of the inside of the medium pressure, bourdon tube elliptical cross section will be tending to circular cross section. Formed by tube small deformation, wavelengths, a certain ring stress. The ring stress can make the bourdon tube extends outward. As there is no fixed elastic bourdon tube head, it can produce small deformation, the deformation depends on the size of the measuring the pressure of medium size. Bourdon tube deformation through movement indirectly by pointer display measuring the pressure of medium.