The mass of oil (including oil droplets, suspended particles, oil vapor) contained in compressed air per unit volume is converted to the value under atmospheric conditions of absolute pressure 0.1MPa, temperature 20 ° C and relative humidity 65%. Unit: mg / m3 (refer to absolute value)
PPM is a symbol for the content of trace substances in a mixture, referring to parts per million or parts per million (parts weight ratio PPMw and volume ratio PPMv). (Reference ratio)
Usually we call PPM as weight ratio. (One millionth of a kilogram is milligrams)
1PPMw = 1.2mg / m3 (PA = 0.1MPa, t = 20 ℃, φ = 65%)
The exhaust oil content of general oil-injected screw air compressors is below 5PPM, but the exhaust gas of centrifuges and oil-free machines is oil-free. Considering the oil particles originally contained in the air, it is impossible to reach 100%
