1. The use of motor horsepower to mark: It is the practice when early air pressure technology was underdeveloped and it is rarely used. Because with the continuous development of technology, now even if the same motor is used, the pressure of the air compressor will vary depending on the pressure level, the size of the air compressor manufacturer and the size of the air compressor.
2. Piston displacement is used to indicate: Since this is the design information of the air compressor, only the cylinder size must be multiplied by the number of revolutions. Therefore, it is used by many manufacturers.
3. Inlet volume is used to indicate: This expression is usually measured on the inlet side with an Orifice meter and is currently only used to indicate the size of the centrifugal compressor. The unit used is ICFM. Although this is more accurate than the previous two methods, it is still higher than the actual outflow because it does not account for internal losses.
4. Free air delivery (FAD) is used to indicate: This method uses the aperture flow meter to measure at the outlet side. Because it is accurate, it becomes the main standard in the world, and it is used to measure the actual air output volume of the air compressor, such as ISO. , ASME, JIS, etc.
