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 amount of pressure per unit area. Absolute pressure: The pressure above the absolute pressure zero, based on the absolute pressure zero. Positive pressure: A pressure above atmospheric pressure based on atmospheric pressure. Negative pressure (vacuum): A pressure below atmospheric pressure based on atmospheric pressure. Differential pressure: The difference between the two pressures. Gauge pressure: A pressure greater or less than atmospheric pressure based on atmospheric pressure. Pressure gauge: A gauge used to measure less than or greater than atmospheric pressure based on atmospheric pressure.
In addition, in the process of industrial process control and technical measurement, mechanical pressure gauges are more and more widely used due to the high mechanical strength and convenient production characteristics of the elastic sensitive components of mechanical pressure gauges.
The elastic sensitive element in the mechanical pressure gauge is elastically deformed as the pressure changes. Mechanical pressure gauges use spring tubes (Bourdon tubes), diaphragms, bellows and bellows and other sensitive components and are classified accordingly. The measured pressure is generally considered to be relative pressure. Generally, the relative point is selected as atmospheric pressure. The elastic deformation of the elastic element under the pressure of the medium is amplified by the gear transmission of the pressure gauge, and the pressure gauge displays a relative value (high or low) with respect to atmospheric pressure. And the pressure value within the measurement range is displayed by the pointer, and the indication range of the dial is generally 270 degrees.
It is understood that the pressure gauge can be classified according to its measurement accuracy, indication pressure, measurement range and the like. Among them, the pressure gauge can be divided into a precision pressure gauge and a general pressure gauge according to its measurement accuracy. The precision measurement grades of precision pressure gauges are 0.1, 0.16, 0.25, and 0.4, respectively; the measurement accuracy grades of general pressure gauges are 1.0, 1.6, 2.5, and 4.0, respectively.
Pressure gauges are classified into general pressure gauges, absolute pressure gauges, and differential pressure gauges according to their reference pressures. The general pressure gauge is based on atmospheric pressure; the absolute pressure gauge is based on the absolute pressure zero; the differential pressure gauge measures the difference between the two measured pressures.
According to the measuring range, the pressure gauge is divided into vacuum gauge, pressure vacuum gauge, micro pressure gauge, low pressure gauge, medium pressure gauge and high pressure gauge. The vacuum gauge is used to measure the pressure value less than atmospheric pressure; the pressure vacuum gauge is used to measure the pressure value less than and greater than the atmospheric pressure; the micro pressure gauge is used to measure the pressure value less than 60000 Pa; the low pressure gauge is used to measure the pressure value of 0-6 MPa The medium pressure gauge is used to measure the pressure value of 10~60MPa; the high pressure gauge is used to measure the pressure value above 100MPa.
The housing of the seismic pressure gauge is made into a fully sealed structure, and the damping oil is filled in the housing, and the damping effect can be used in a measurement site where the working environment vibrates or the medium pressure (load) pulsates. The pressure gauge with the electric contact control switch can realize the alarm or control function. The pressure gauge with the remote transmission mechanism can provide the electrical signal (such as the resistance signal or the standard DC current signal) required in industrial engineering.
In addition, the separator (chemical seal) used in the diaphragm can isolate the measured medium from the meter through the diaphragm to measure the pressure of strong corrosion, high temperature, and easily crystallized medium.
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