Pressure gauge is a meter that uses a spring element as a sensitive component to measure and indicate above ambient pressure. The application of pressure gauges is extremely common and it covers almost all industrial processes and scientific research fields. In the field of heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance and repair shop, etc. can be seen everywhere. Especially 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 selection of pressure gauges can be considered in terms of range, type and accuracy.
a When measuring the steady pressure, the general gauge maximum range selection is close to or greater than 1.5 times the normal pressure measurement;
b When measuring the pulsating pressure, the general gauge maximum range selection is close to or greater than 2 times the normal pressure measurement value;
c When measuring the outlet pressure of the pump, the maximum range of the general pressure gauge is selected to be close to the maximum pressure of the pump outlet;
d When measuring high pressure, the maximum range selection of the general pressure gauge should be greater than 1.7 times the maximum pressure measurement;
a pressure tube > 0.4MPa, spring tube pressure gauge can be selected;
b When measuring pressure <0.04MPa, bellows and bellows pressure gauges are available;
c When measuring viscous, easy to crystallize, corrosive, and containing solid particles, a diaphragm pressure gauge or a chemical seal device may be used;
d Measure steam or medium pressure measurement above 60 ° C should choose stainless steel pressure gauge or install condensation ring;
e pulsation pressure measurement should be attached to a damper or a seismic pressure gauge;
f should be equipped with dust collector when measuring dust gas;
g gas-liquid separator should be set when measuring the pressure of liquid containing liquid; h. Some chemical medium should be selected with special pressure gauge: the pressure gauge for ammonia-containing medium is measured by ammonia, and the pressure of oxygen-containing pressure is measured by oxygen pressure gauge. The acetylene pressure gauge is used for the measurement of acetylene pressure, and the sulfur pressure gauge is used for the pressure of the sulfur-containing medium;
Accuracy selection When measuring stable pressure, the accuracy of general pressure gauge is 1.5 or 2.5, but now there are many series of high-grade, high-precision pressure gauges in the mainstream of the market, such as YK-120B digital display pressure gauge, there are 0.5, 0.4 Level, 0.25, 0.1, 0.05 and 0.02. The higher the accuracy, the more expensive the price.