Engineering Data:Standards and publications
Standards and publications
Hydraulic accessories:Beta ratio
Beta ratio It is a measure of a filter's efficiency. It is defined as the number of particles upstream from the filter that are larger than the micron rating of the filter, divided by the number of particles downstream from the filter larger than the micron rating of the filter. The example illustrated below demonstrates the concept of beta ratio quite clearly. From Figure 7.4, it is seen that there are 200 particles upstream from the filter which are larger than 3 !Jm in size. A filter having a lower beta ratio is less efficient because it allows more particles through it. Again referring the example above, it is seen that while the filter at the top allows 100 particles through, only 1 particle is allowed to pass through the filter at the bottom. The beta ratio for the filter at the top is given by f3 = 200/100 = 2 which is a less efficient value, whereas the beta ratio for the filter at the bottom is given by f3 = 200/ 1 = 200 which is a more efficient value. The followi...
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