Classification of pressure gauge
Definition of pressure:
The concept of pressure here actually refers to the physical pressure, that is, the size of the pressure per unit area.
Absolute pressure: the pressure higher than the absolute pressure zero position based on the absolute pressure zero position.
Positive pressure: pressure higher than atmospheric pressure based on atmospheric pressure.
Negative pressure (vacuum): the pressure lower than atmospheric pressure based on atmospheric pressure.
Differential pressure: the difference between two pressures.
Gauge pressure: pressure greater than or less than atmospheric pressure based on atmospheric pressure.
Pressure gauge: an instrument used to measure less than or greater than atmospheric pressure based on atmospheric pressure.
Pressure gauge:
In the process of industrial process control and technical measurement, mechanical pressure gauges have been used more and more widely due to the high mechanical strength and convenient production of the elastic sensitive elements of mechanical pressure gauges.
The elastic sensitive element in the mechanical pressure gauge produces elastic deformation with the change of pressure. The mechanical pressure gauge adopts spring tube (Bourdon tube), diaphragm, bellows, bellows and other sensitive elements and is classified according to this. The measured pressure is generally regarded as the relative pressure. Generally, the relative point is atmospheric pressure. The elastic deformation of the elastic element under the action of the medium pressure is amplified by the gear transmission mechanism of the pressure gauge, and the pressure gauge will display the relative value (high or low) relative to the atmospheric pressure.
Classification of pressure gauge:
Pressure gauges can be divided into precision pressure gauges and general pressure gauges according to their measuring accuracy. The measuring accuracy class of precision pressure gauge is 0.25 and 0.4 respectively; The measurement accuracy class of general pressure gauge is 1.0, 1.6, 2.5 and 4.0 respectively.
According to the nominal diameter of the shell, the pressure gauges commonly used are ￠ 40, ￠ 50, ￠ 60, ￠ 75, ￠ 100, ￠ 150, ￠ 200, ￠ 250mm
According to its installation method, the pressure gauge can be divided into radial direct installation, axial direct installation, radial forward band edge installation, radial backward band edge installation, and axial forward band edge installation
The pressure gauge is divided into general pressure gauge, absolute pressure gauge and differential pressure gauge according to the basis of its indicated pressure. General pressure gauge is based on atmospheric pressure; The absolute pressure gauge is based on the absolute pressure zero position; The differential pressure gauge measures the difference between the two measured pressures.
The pressure gauge is divided into vacuum gauge, pressure vacuum gauge, micro pressure gauge, low pressure gauge, medium pressure gauge and high pressure gauge according to its measuring range. The vacuum gauge is used to measure the pressure value less than atmospheric pressure; The pressure vacuum gauge can be used to measure the pressure value less than and greater than the atmospheric pressure at the same time; The micro pressure gauge is used to measure the pressure value less than 60K Pa; The low pressure gauge is used to measure the pressure value of 0~6MPa; 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.
