Filters for compressed air— Test methods—Part 1: Oil aerosols
First edition (2007)
|ISO 12500-1 specifies test and inlet (challenge) conditions for compressed air filters for liquid oil separation. ISO 12500-1 determines the residual (liquid) oil content and the according differential pressure of a compressed air filter at the standardized test and inlet conditions:
|An inlet challenge concentration of 10 mg/m³ as well as the requested particle size distribution is not really representative for modern compressed air systems.
|For liquid separation in compressed air filters many interlinked physical processes are involved, resulting in a multi-dimensional array of working conditions while ISO 12500-1 just supplies a result for one working point in this multi-dimensional array. A “good” filter when tested according to ISO 12500-1 thus may deliver a “bad” performance in a deviant real life operation and vice versa. The result of ISO 12500-1 thus may be misleading and may conclude to a wrong assignment of products in regards of “good” or “bad”.
|A compressed air filter series offering 12 filter sizes and 3 filtration grades would require the test of 108 filter elements or 324 total tests. Even a 24h continuous testing would last at least 6 months.