Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice. A|4 Solutions for pneumatic automation General Catalogue APPENDIX A Appendix Air quality Compressed air is a fundamental element for the operation of various modern industrial machines. Different compressed air purity classes are required depending on its application and the industrial sector in which it is used. Generally, it must be free of pollutants (dusts, water and oil) in order to maintain the characteristics of the final product and guarantee safety. Standard ISO 8573-1:2010 specifies the permissible level of pollution for every cubic meter of compressed air. The pollutants that have been analysed are grouped in three macro-families: • Dusts / Solid particles Each cubic meter of compressed air could contain a maximum quantity of particles in function of its dimension. • Water It could be present in liquid or gaseous state. • Oil Each cubic meter of compressed air can contain a maximum oil quantity in any of its form: liquid, aerosol, or vapour. To uniquely determine the purity of compressed air, it is necessary to identify a numeric value for each of the three groups of pollutants illustrated above. In general, industrial machines require compressed air with purity class of ISO 8573-1:2010 [1:4:1] of which: • the first number (1) refers to solid particles with maximum concentration in proportion to their size but still less than 0.1 mg/m3; • the second number (4) refers to dried air with dewpoint temperature less than +3°C; • The third number (1) refers to residual oil content less than 0.01 mg/m3. For a correct operation of our devices, we require compressed air with purity class of ISO 8573-1:2010 [7:4:4] unless otherwise indicated. For example, our proportional regulators require compressed air with a purity class of ISO 8573-1:2010 [1:4:1]. According to standard ISO 8573-1:2010 pollutant levels could be summarized in the following table: Total Oil 0,1 µm < d ≤ 0,5 µm 0,5 µm < d ≤ 1,0 µm 1,0 µm < d ≤ 5,0 µm 0 1 ≤ 20000 ≤ 400 ≤ 10 - ≤ -70 - ≤ 0,01 2 ≤ 400000 ≤ 6000 ≤ 100 - ≤ -40 - ≤ 0,1 3 - ≤ 90000 ≤ 1000 - ≤ -20 - ≤ 1 4 - - ≤ 10000 - ≤ +3 - ≤ 5 5 - - ≤ 100000 - ≤ +7 - - 6 0 < Cp ≤ 5 ≤ +10 - - 7 5 < Cp ≤ 10 - Cw ≤ 0,5 - 8 - - 0,5 < Cw ≤ 5 - 9 - - 5 < Cw ≤ 10 - X Cp > 10 - Cw > 10 >5 Compressed air purity classes according to ISO 8573-1:2010 Classe Particles Humidity and Liquid Water Maximum number of particles per cubic meter as a function of particle size d b Mass concentrationb Cp[mg/m3] Pressure dewpoint [°C] Concentration of liquid waterb CW[g/m3] - b At reference condition: - Air temperature 20°C - Absolute air pressure 100 kPa = [1 bar] (a) - Relative water vapour pressure 0 As specified by the equipement user or supplier and more stringent than Class 1 - - - - Concentration of total oilb (liquid, aereosol and vapour) [mg/m3] Air quality
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