Compressed Air

Compressed air particle testing standards are published by ISO. They cover contaminants and purity classes, particle content, and testing microbiological contaminant content and solid particle content by mass concentration. They can be purchased separately or as a package containing all parts of the ISO 8573 series.

ISO 8573 - Compressed Air Package

ISO 8573-1, ISO 8573-2, ISO 8573-3, ISO 8573-4, ISO 8573-5, ISO 8573-6, ISO 8573-7, ISO 8573-8 and ISO 8573-9

The Compressed Air Package identifies microbiological and gaseous contaminants in particles, water and oil from various sources of compressed air. The test methods included in the package which can be applied to various sources of compressed air are for: measurement of humidity, oil aerosol content, solid particle content, oil vapor /organic solvent content, gaseous / microbiological contaminant content and liquid water content. It also has vocabulary standards to be used for the application of testing. This package contains the following ISO documents: ISO 8573-1:2010, ISO 8573-2:2018, ISO 8573-3:1999, ISO 8573-4:2019, ISO 8573-5:2001, ISO 8573-6:2003, ISO 8573-7:2003, ISO 8573-8:2004 and ISO 8573-9:2004. This package has a total savings of 30% off the individual list price.

ISO 8573-1:2010

Compressed air - Part 1: Contaminants and purity classes

ISO 8573-1:2010 specifies purity classes of compressed air with respect to particles, water and oil independent of the location in the compressed air system at which the air is specified or measured. ISO 8573-1:2010 provides general information about contaminants in compressed-air systems as well as links to the other parts of ISO 8573, either for the measurement of compressed air purity or the specification of compressed-air purity requirements. In addition to the above-mentioned contaminants of particles, water and oil, ISO 8573-1:2010 also identifies gaseous and microbiological contaminants. Guidance is given in Annex A on the application of ISO 8573-1:2010.

ISO 8573-4:2019

Compressed air - Contaminant measurement - Part 4: Particle content

This document provides a method for sampling compressed air and a guide for choosing suitable measuring equipment to determine its particle size and concentration by number (to be referenced as concentration throughout this document). It also describes the limitations of the various measurement methods and describes the evaluation and uncertainty considerations. This document will report the particle size and concentration of all types of particle combined and does not aim to be able to segregate the separate solid and liquid particle fractions. When it is required that the concentration of a specific fraction is to be determined then recourse to the relevant standard method from the ISO 8573 series is recommended. NOTE 1 The test methods described in this document are those suitable for determining the purity classes given in ISO 8573 1. NOTE 2 Particle content determined as concentration by mass is dealt with in ISO 8573 8. NOTE 3 This document does not address instances where non-isothermal conditions exist, and separate arrangements should be made where particles may be formed by vapour condensation or lost through evaporation.

ISO 8573-7:2003

Compressed air - Part 7: Test method for viable microbiological contaminant content

ISO 8573-7:2003 specifies a test method for distinguishing viable, colony-forming, microbiological organisms (e.g. yeast, bacteria, endotoxins) from other solid particles which may be present in compressed air. One of a series of standards aimed at harmonizing air contamination measurements, it provides a means of sampling, incubating and determining the number of microbiological particles. The test method is suitable for determining purity classes in accordance with ISO 8573-1, and is intended to be used in conjunction with ISO 8573-4 when there is need to identify solid particles that are also viable, colony-forming units.

ISO 8573-8:2004

Compressed air - Part 8: Test methods for solid particle content by mass concentration

ISO 8573-8:2004 specifies test methods for determining the solid particle mass concentration in compressed air, expressed as the mass of solid particles with maximum particle size limits. The methods' limitations are also specified. One of a series of standards aimed at harmonizing air contamination methods, it identifies sampling techniques and also gives requirements for evaluation, uncertainty considerations and reporting for the air purity parameter solid particles by mass concentration. The test methods are suitable for determining the purity classes in accordance with ISO 8573-1. (Particle content based on counting particles is dealt with in ISO 8573-4.)