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Air Filter Efficiency Test Methods

COUNTING METHOD (DOP/PSL) Apply to ULPA/HEPA Filter

Applicable test aerosol is DOP (di-octyl phthalate) or PSL(polystyrene latex spheres). This Kind of aerosol is generated by monodispersion and fed into the upstream side of the testing filter.Use two particle counters to measure the concentrations upstream and downstream to determine the collection efficiency.

COLORIMETRY METHOD (NBS) Apply to MEDIUM/BAG Filter

Sample amount of particle by media at both of upstream and downstream of testing filter. Project light to sampling media and measure the transmitted light volume.The transmitted light volume indicate by optical density (OD) that measured by colorimeter. The Collection efficiency is calculated from difference of optical density at sample media.

MASS CONCENTRATION METHOD (AFI) Apply to PRE Filter

Testing dust is fed into the top inlet of test facility,and then collected by testing filter. A back-up filter is inst alled to catch all dust that passed testing filter. Accroding to the relevant weight criteria of dust caught by testing filter and back-up filter. The collection efficiency would be calculated.

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