Manometers are instruments that use elastic components as sensitive components to measure and indicate above ambient pressure. Also called pressure gauge. Applications are extremely common and are found in virtually all industrial processes and scientific research. In the field of heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance and repair shop, etc. Especially in the process of industrial process control and technical measurement, mechanical manometers are more and more widely used due to the high mechanical strength and convenient production of elastic sensitive components of mechanical manometer.
Manometer according to its measurement accuracy: can be divided into precision pressure gauges, general pressure gauges. The precision of the precision pressure gauges is 0.1, 0.16, 0.25, and 0.4, respectively. The accuracy of the general pressure gauges is 1.0, 1.6, 2.5, and 4. 0.
The pressure gauge is based on its measurement standard: the pressure gauge is divided into a general pressure gauge, an absolute pressure gauge stainless steel pressure gauge, and a differential pressure gauge according to the reference of the indicated pressure. 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.
The pressure gauge according to its measurement range: 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 Medium pressure gauge is used to measure the pressure value of 10~60MPa;
The pressure gauge is displayed according to its mode: it is divided into a pointer pressure gauge and a digital pressure gauge.
The pressure gauge is divided according to its function: the pressure gauge can be divided into the local indication type pressure gauge and the charged signal control type pressure gauge according to the different functions of the pressure gauge.
General pressure gauges, vacuum pressure gauges, shock-resistant pressure gauges, stainless steel pressure gauges, etc. all belong to the local indication type pressure gauge, and there is no other control function except the indicated pressure.
The output signals of the charged signal control type pressure gauge mainly include:
1, switching signals (such as electrical contact pressure gauge)
2, resistance signal (such as resistance remote pressure gauge)
3, current signal (such as inductive pressure transmitter, remote pressure gauge, pressure transmitter, etc.)
The pressure gauge can be divided into: according to the characteristics of the measured medium:
1. General pressure gauge: The general pressure gauge is used to measure the pressure of liquid, gas or steam which has no corrosive effect on copper and copper alloy without explosion, no crystallization or solidification;
2, corrosion-resistant pressure gauge: corrosion-resistant pressure gauge is used to measure the pressure of corrosive medium, commonly used stainless steel pressure gauge, diaphragm pressure gauge, etc.;
3, explosion-proof pressure gauge: Explosion-proof pressure gauges are used in hazardous areas with explosive mixtures in the environment, such as explosion-proof electrical contact pressure gauges, explosion-proof transmitters, etc.
4. Special pressure gauges.
According to the use of pressure gauge: can be divided into ordinary pressure gauge, ammonia pressure gauge, oxygen pressure gauge, electric contact pressure gauge, remote pressure gauge, vibration pressure gauge, pressure gauge with inspection pointer, double needle double tube or double needle single Pipe pressure gauge, digital pressure gauge, digital precision pressure gauge, etc.
