What is a Beta Rating in Filtration?

What is a Beta Rating in Filtration?

The most important property of a filter is its efficiency, the Micron Rating is negligible whether you have a 3µ filter or a 100µ filter it does not matter unless your filter is removing the particulates from the filtration medium, this is why the Beta rating, β, is important.

Simply put the Beta rating, β, is the efficiency of the media within the filter element and is written as the number of particles that will pass through element and into the system. For example a filter with a rating of 10µ > β1000 means that 1 in every 1000 particles greater than or equal to 10µ will pass through the media which can also be written as an efficiency of 99.9%.

See the table below for more detail:

Beta Rating

Upstream Particles

Downstream Particles

Efficiency

2

1000

500

50.0%

200

1000

5

99.5%

1000

1000

1

99.9%

To calculate the Beta rating, you simply take the number of upstream particles and divide this by the number of downstream particles, as shown below:

Simply looking at a filter a β1000 element and a β20 element on the outside they may look identical however, the difference between the two is critical in ensuring the safety of your hydraulic system against potentially harmful particulates. At FilterFinder all our hydraulic filter elements are rated at either β1000 or β200 to prevent damage to our customers systems and be certain that they are running as efficiently as they can be.