- Dirt – in the form of solid particles down to a size of about 10 microns – must be removed from the air. This is best done with filters, or with reducing valves provided with filters.
- Oil from oil-lubricated compressors always finds its way into compressed air and could lead to contamination. Filters or oil separators should be installed before the instruments – or for small plants, oil-free compressors can be an alternative.
- Condensation takes place at various rates in a compressed air system.. Therefore air should be dried to remove the condensate. If the air contains a lot of water, install a primary separator before the filter.
It is important to remember that air filters should be placed so that they are easy to check and access daily and to change when necessary.
