Vacuum Pressure Gauge Refers to atmospheric pressure an […]
Vacuum Pressure Gauge Refers to atmospheric pressure and is used to measure less than atmospheric pressure. The vacuum pressure gauge is suitable for measuring the vacuum pressure of liquids and gases that do not explode, crystallize, solidify, and have no corrosive effect on copper and copper alloys. It is widely used in gas transportation, pipeline liquids and closed containers to measure the pressure of various liquids, gases, steam and other media that are non-corrosive, non-explosive, non-crystalline and non-solidified, such as various industrial automatic control environments, involving petroleum Pipeline, water conservancy and hydropower, railway transportation, intelligent building, production automation, aerospace, military industry, petrochemical, oil well, electric power, ship, machine tool, pipeline air supply, vacuum equipment and many other industries. Let me introduce to you "how to set the vacuum pressure gauge and how to read the vacuum pressure gauge"
1. How to set the vacuum pressure gauge
Install the valve on the pressure point on the pipeline or vacuum pump, and then install the vacuum gauge on the valve. The other end is connected to the equipment that needs to be evacuated, the valve is opened, and the vacuum pump is started. At this time, the pointer of the pressure gauge swings counterclockwise, shifting from the 0 scale to the -0.1 direction. The pointer is at -0.1, which is close to vacuum, but not equal to vacuum.
The outer ring reads in red, corresponding to the red unit PSI. The inner circle is read in black, corresponding to the black unit MPa. Turn off the vacuum pump for a period of time, the pointer does not shift, and it can be used normally.
2. How to see the vacuum pressure gauge
inHg is inches of mercury, bar is bar, MPa is megapascal 1MPa=145psi, PSI is pounds, pressure is easier to understand by looking at MPa, R and numbers are the codes of the refrigerant meter.
Under normal circumstances, the pointer of the pressure vacuum gauge is directly above, which means that the pressure is 0 (the actual pressure is 1 atmosphere); when the pointer of the pressure gauge swings clockwise, it means that the pressure is higher than the atmospheric pressure, and the higher part is subject to the reading of the table; When the pointer of the pressure gauge swings counterclockwise, it indicates that the pressure is lower than atmospheric pressure, and negative pressure (vacuum) occurs. The size of the vacuum is the reading of the pressure gauge. This kind of gauge is rare in the market, and it is a kind of system pressure that can be measured. and vacuum gauge, so it is called "pressure vacuum gauge".
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