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Interpretation of related basic concepts of pressure gauges

2017-06-05 browse:652

In the control and measurement process, the elastic sensitive element of mechanical pressure gauge has the characteristics of high mechanical strength and convenient production, the mechanical pressure gauge is widely used.

So, how do you understand the pressure in the pressure gauge? The concept of pressure here actually refers to the physical pressure, that is, the magnitude of the pressure on the unit area. Absolute pressure: the absolute pressure zero is the benchmark, higher than the absolute pressure zero pressure. Barotropic: atmospheric pressure as the basis, higher than the pressure of atmospheric pressure. Negative pressure (vacuum): Based on atmospheric pressure, below the pressure of atmospheric pressure. Differential pressure: the difference between two pressures. G: the atmospheric pressure as the benchmark, is greater than or less than atmospheric pressure pressure. Pressure meter: an instrument based on atmospheric pressure for measuring less than or greater than atmospheric pressure.

In addition, in the process of industrial control and measurement process, the elastic sensitive element of mechanical pressure gauge has the characteristics of high mechanical strength and convenient production, the mechanical pressure gauge is widely used. The elastic sensors in the mechanical pressure gauge produce elastic deformation with the change of the pressure. The mechanical pressure gauge adopts spring tube (Bourdon tube), diaphragm, diaphragm and bellows classification and other sensitive components according to this. The measured pressure is generally regarded as relative pressure. The general relative point is selected as atmospheric pressure. The elastic deformation of the elastic element under the action of the medium pressure is magnified by the gear drive mechanism of the pressure gauge, and the pressure gauge will show the relative value (or high or low) relative to the atmospheric pressure. The pressure value in the measuring range is displayed by a pointer, and the indication range of the dial plate is generally made 270 degrees.

It is understood that the pressure gauge can be classified according to its measurement accuracy, indication pressure and measuring range. Among them, the pressure gauge according to its measurement accuracy, can be divided into precision pressure gauge, general pressure gauge. The accuracy levels of the precision pressure gauges are 0.1, 0.16, 0.25 and 0.4 respectively. The measurement accuracy levels of the general pressure gauges are 1, 1.6, 2.5 and 4 respectively.

The pressure gauge is divided into a general pressure gauge, an absolute pressure gauge and a differential pressure gauge according to the different standards of the indicated pressure. The general pressure gauge is based on atmospheric pressure; the voltmeter is based on absolute zero pressure; the differential pressure gauges measure the difference between the two measured pressures.

The pressure gauge is divided into vacuum meter, pressure vacuum meter, micro pressure meter, low pressure meter, middle pressure meter and high voltage meter according to its measuring range. Used to measure the atmospheric pressure is less than the pressure value of the vacuum gauge; pressure vacuum gauge used to measure the atmospheric pressure is larger than the pressure value; micro pressure gauge for measuring the pressure value is less than 60000 Pa; low voltage meter for measuring 0~6MPa value of pressure; pressure meter for measuring 10~60MPa value of pressure; pressure gauge for measuring the pressure value of more than 100MPa.

Seismic pressure gauge shell made of full sealed structure, and filled with damping oil in the shell, because the damping effect can be used in the work of environmental vibration or medium pressure pulse measurement sites (load). The pressure gauge with electric contact control switch allows the sender of the alarm or control functions, with pressure gauge remote mechanism can signal required in Industrial Engineering (such as DC resistance standard current signal or signal).

In addition, the isolator (chemical seal) used in the diaphragm can be separated from the instrument and the instrument by isolating the diaphragm to measure the pressure of the strong corrosion, high temperature and easy crystallization medium.