ISO 29463-2-2011 pdf free download.High-efficiency filters and filter media for removing particles in air – Part 2:Aerosol production, measuring equipment and particle-counting statistics.
This part of ISO 29463 specifies the aerosol production and measuring equipment used for testing high- efficiency filters and filter media in accordance with ISO 29463-3. ISO 29463-4 and ISO 29463-5, as well as the statistical basis for particle counting with a small number of counted events. It is intended to be used in conjunction with ISO 29463-1, ISO 29463-3, ISO 29463-4 and ISO 29463-5.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies,
ISO 29463-1. High-efficiency filters and filter media for removing particles in air — Part 1: Classification, performance, testing and marking
ISO 29463-3. High-efficiency filters and filter media for removing particles in air — Part 3: Testing flat sheet filter media
ISO 29463-4:2011. High-efficiency filters and filter media for removing particles in air — Part 4: Test method for determining the leakage of filter element — Scan method
ISO 29463-5:2011, High-efficiency filters and filter media for removing particles in air — Part 5: Test method for filter elements
ISO 294641), Cleaning equipment for air and other gases — Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 29463-1. ISO 29464, and the following apply.
3.1 counting efficiency
expression of that proportion of the particles of detectable size suspended in the volume flow under analysis that make their way through the measured volume and are counted by the particle counter
EXAMPLE The ratio of the concentration measured to actual aerosol concentration,
NOTE The counting efficiency depends on the partide size, and decreases progressively in the proximity of the lower detection limit of the particle counter.
4 Aerosol production
When testing a filter, a test aerosol with liquid particles shall be used as reference test method in accordance with ISO 29463-1. Alternatively, a solid PSL aerosol may be used for local efficiency (leak) testing (see ISO 29463-4:2011, Annex E).
The testing of high-performance filters (ISO 65 U and higher) requires methods of aerosol production with high production rates (1010 s 1 to 1011 s 1), in order to provide statistically significant measurements downstream of the filter.
By adjusting the operating parameters of the aerosol generator, it shall be possible to adjust the mean particle diameter of the aerosol so that it is equal to the MPPS. The concentration and the size distribution of the aerosol produced shall remain constant throughout the test.
4.1 Aerosol substances
A suitable aerosol substance for the reference test method is a liquid with a vapour pressure that is so low at the ambient temperature that the size of the droplets produced does not change significantly due to evaporation over the time scale relevant for the test procedure (in the order of a few seconds).ISO 29463-2 pdf download.
Tags: High-efficiency filters and filter media
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