Filtration
Filtration
(OP)
I there a difference between absolute filter efficiency rating and beta ratio? Is there a ASTM standard related to this subject?
Thanks
Tom
Thanks
Tom
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RE: Filtration
Beta ratios are given for specific micron ratings. For example, a B10 = 200 means that a filter has a Beta ratio of 200 for a 10 micron size. a B5 = 200 would have Beta ratio of 200 for a 5 micron size.
The efficiency of the filter is determined by taking the Beta ratio minus one, dividing it by the Beta ratio, and then multiplying by 100. An example for a Beta ratio of B10=200 is --> [(200 - 1) / 200] X 100 = 99.5%. So this filter is 99.5% efficient in removing particles of 10 micron size.
Regards,
Schlebb