The selection of pressure gauge mainly includes the following seven points that are easy to make mistakes
Note 1
Dial diameter of pressure gauge: it can be defaulted to the shell diameter of pressure gauge, which is usually 40mm, 50mm, 63mm, 75mm, 100mm, 150mm, 200mm.
Note 2
Shell material of pressure gauge: generally, the shell material of pressure gauge includes ABS plastic shell pressure gauge, copper shell pressure gauge, polypropylene shell pressure gauge, carbon steel shell pressure gauge (iron shell pressure gauge), 304 stainless steel pressure gauge. The specific pressure gauge material can be selected according to the actual use environment.
Precautions 3
Connection mode of pressure gauge: the connection mode of pressure gauge is divided into axial pressure gauge (back connection pressure gauge), radial pressure gauge (bottom connection pressure gauge), etc. according to the specific situation, if it is panel mounted, the axial one can choose front flange edge or rear with fixed bracket, and the radial one can choose front flange edge or rear fixed edge, etc.
Precautions 4
Pressure gauge pressure measuring medium: generally, there are only two materials (standard) for pressure gauge liquid connection, namely copper alloy and 316 stainless steel. If the medium you are measuring is not suitable for or corroded by the two, you can use the pressure gauge together with the chemical seal (the function of the chemical seal is to effectively prevent the measurement medium and measurement without affecting the pressure measuring element's measurement of the medium pressure gauge The measuring element contacts, thus protecting the measuring element and prolonging the service life of the measuring element.
Precautions 5
Pressure gauge liquid filling: in some environments with large mechanical vibration, the multi pressure gauge dial is generally filled with liquid. In fact, the main function of these liquids is to increase resistance and effectively prevent the constant vibration of pressure gauge pointer, so as to accurately read the pressure value, which is commonly used near the pump or in environments with severe vibration. Selection of pressure gauge
Precautions 6
Medium temperature of pressure gauge: the medium temperature of general copper alloy measuring element is + 80 ℃, and that of stainless steel pressure gauge is + 200 ℃. But if the pressure gauge you choose is a liquid filled and shock resistant pressure gauge, the medium temperature can only reach + 100 ° C at this time. If the temperature is too high, but also shock resistant, the way we use is condensation bend.
Precautions 7
Measuring range of pressure gauge: since the pressure gauge is driven by the deformation of measuring element and the rotation of pointer through the amplification mechanism, so as to display the pressure value, we should also pay attention to the selection of measuring range. Generally, it is ideal that the large pressure measured is 3 / 4 or 2 / 3 of the measuring range of pressure gauge. If the large pressure is selected, the change of pointer is small, and the pressure value read out is not accurate. If the small pressure is selected, the change of pointer is small Yes, the pressure gauge will be damaged due to overload.
