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Element Data



Beta ratio designation for filters efficiency is a part of the standard multipass test described in ANSI 93.31. Unlike previous efficiency methods that relied on weight determination, the Beta Rating uses particle counting for efficiency rating, and is more accurate. The Beta Rating is the number of upstream particles of a given size divided by down stream particles of the same size.

Beta Ratios:   Bmicron = Nx (particle count upstream) / Ny (particle count down stream)

From this data the element efficiency can be calculated as follows:

Efficiency Rating % = Nx - Ny / Nx        x100 = 100 -  (100 / Bmicron)

The beta ratio is a formula used to calculate the filtration efficiency of a particular fluid filter using data obtained from multi-pass testing. Multi-pass testing is endorsed by the National Fluid Power Association, the American National Standards Institute (ANSI), and the International Standards Organization (ISO) as the most reliable procedure to measure liquid filtration effectiveness.


Example:  5 micron particles were fed into a liquid stream and particles counted upstream were 127,000. The 5 micron count downstream from the filter was 5,000.

The efficiency of the element would be:

B5 = ( 127,000 / 5,000 )  = 25.4

Efficiency % = 100 - (100 / 25.4 ) = 96%


Significance of (B) beta value in particle count control:

1.0 0
1.5 33
2.0 50    (nominal rating)
10.0 90
20.0 95
50.0 98
75.0 98.7    (absolute rating)
100.0 99
200.0 99.5
1000.0 99.9



BETA 75   VS.   BETA 200


Originally, the PALLTM Corp. used the letter 'U' in their nomenclature. The media was rated Betax = 75 (98.7% efficient.)

Example  HC9600FUP8H

The above element was rated Beta3 = 75, meaning it had an absolute rating of 3 micron.

Next, PALLTM then introduced media designated 'D.' Rated Betax = 200, and was 99.5% efficient at the given micron rating.

Example:  HC9600FDP8H

Important note: A difference of .8%! (Less than 1% difference between an element with a Beta Rating of 75 and one with a Beta Rating of 200.) Good marketing strategy with no significant increase in performance.

Then PALLTM introduced the 'K' media.

Example:  HC9600FKP8H

Also rated at Betax = 200. This version did away with the rigid outer wire mesh support and replaced it with a nylon screen and an outer spiral wrap. We think it reduced manufacturing costs and the life of the element.

FILTER-MART uses a specially designed filter media with a low initial differential pressure supported inside and outside with strong wire mesh screen. What is the advantage? Longer element life.


PALLTM is a Trademark of Pall Corporation


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