The standard DIN ISO 8573-1 defines the quality classes of compressed air with regard to:
Determination of the residual amount of aerosols (liquid particles up to 0.01μ) and hydrocarbons (fully vaporized gaseous), which may be contained in the compressed air.
Particle size and density
Determination of size and concentration of the solid particles which may still be contained in the compressed air.
Determination of the temperature to which the compressed air can be cooled without condensing the water vapor contained in it. The pressure dew point changes with the air pressure.
The standard is divided into two sections with nine subgroups with individual definitions. The standard is written as a worldwide standard in English and is available as a printed publication only in English:
The compressed air quality standard ISO8573
Part 1 Compressed air - Contaminants and purity classes
Parts 2 - 9 specifying the methods of testing a range of contaminants.
SPECIFIES THE AMOUNT OF CONTAMINATION ALLOWABLE IN EACH CUBIC METER OF COMPRESSED AIR
SPECIFIES THE TEST METHOD FOR OIL AEROSOL CONTENT
SPECIFIES THE TEST METHOD FOR THE MEASUREMENT OF HUMIDITY
SPECIFIES THE TEST METHOD FOR SOLID PARTICLE CONTENT
SPECIFIES THE TEST METHOD FOR OIL VAPOR AND ORGANIC SOLVENT CONTENT
SPECIFIES THE TEST METHOD FOR GASEOUS CONTAMINANT CONTENT
SPECIFIES THE TEST METHOD FOR VIABLE MICROBIOLOGICAL CONTAMINANT CONTENT
SPECIFIES THE TEST FOR SOLID PARTICLE CONTENT BY MASS CONCENTRATION
SPECIFIES THE TEST METHOD FOR LIQUID WATER CONTENT
Air quality in accordance with ISO8573-1: 2010
ISO8573-1 is the document of the ISO8573-1 document which specifies the amount of contravention allowed in each cubic meter of compressed air.
ISO8573-1 lists the main contaminants as Solid Particulate, Water and Oil.
a filtration ratio β based on a particle size class is the ratio between the number of particles that flow in the filter and the number of particles that flow out in the filter. The ratio can be expressed by β = 1 / P. Here P is the penetration capacity of the particles, which is expressed by the ratio of the concentration of outflowing particles to the concentration of upflowing particles.
The particle size class is used as an index; the value β10 = 75 means, for example, that the number of particles with the size of 10 μm (β * m) and larger than 75 times higher flows than flows out.
Here you get the norm, please click the link:
ISO 8573-1: 2010-04 Compressed air Part 1: Contaminants and purity classes
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