The test measures the particulate removal efficiency as it relates to the ingression of dirt particles creating increased differential pressure over element life Beta Stability. Selecting filter elements for hydraulic and circulating systems is a serious undertaking because achieving and maintaining clean fluid begins with filter selection.
Effective filtration in hydraulic systems prevents breakdowns and increases the life expectancy of important and expensive components. Beta stability is the measure of how well a filter element is able to maintain its measured Beta Ratio at pressure drops beyond the limits of the normal operating range.
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Toggle navigation Toggle search. How to Evaluate an Oil Filter. Judging by the average Beta Ratio, the elements would appear to have identical properties and no other Beta Ratio comparisons should be made.
In each time frame, the sum total number of upstream particles from each counting period is calculated, then averaged. This may result in a dramatic shortening of component life. Current Issue Archive Advertise. Beta Ratios for filter elements are determined during the multi-pass test as outlined above. Transportation All Industries.
Individual element manufacturers determine the Beta Ratio specification for their elements. During the test, the element differential pressure, the upstream and downstream particle counts and the amount of injected contaminant are continuously monitored. Beta Rating The best and most commonly used rating in industry is the beta rating. The Beta Ratio, or particle removal efficiency, is also a top selection criteria.
Tighter and more efficient media than specified by the manufacturer can result in shortened element life and greater pressure increases. How to Set Oil Cleanliness Targets. Copy this link to share in email or other communications Copy link. Your shirt sleeve may well have a Beta ratio higher than on particles the size of marbles. Calculation of Beta Ratios Beta Ratios for filter elements are determined during the multi-pass test as outlined above.
Less efficient media will generally result in a longer element life, idm youtube er software but does so by allowing a higher percentage of contaminant to pass straight through the filter. The high cost of component repairs and system downtime can be kept to a minimum only through a preventive maintenance program that includes using and maintaining the proper system filtration. An absolute rating gives the size of the largest particle that will pass through the filter or screen.
The ratio is defined as the particle count upstream divided by the particle count downstream at the rated particle size. Contaminants of a given known particle size are counted both before and after the filter. On several recent occasions, I have witnessed someone describing a filter by its nominal rating. The element could be used in all applications where a minimum beta value of is necessary for the proper protection of the hydraulic equipment.
Australasia English India English. This shows that the element has very good Beta stability and will provide the necessary protection at all element differential pressures.
Tests have shown that particles as large as microns will pass through a nominally rated micron filter. While price and delivery are important considerations, filter element performance should be the major deciding factor. Most manufacturers are currently using a minimum Beta Ratio of for a particular micron rating. Energy Equipment Manufacturing.
This test solution is circulated continuously to the test filter at a constant flow rate. Accordingly, the downstream particles are summed and averaged. About the Author Eric Ringholm. Filter ratings are an often misunderstood area of contamination control.
The equipment user may then have to add filtration to achieve the required system performance after the system is purchased, installed and operating. Investigations into the causes of breakdowns in hydraulic systems have shown that the majority of hydraulic-related failures can be attributed to high levels of solid contamination in the fluid. Only after dirt accumulates in the filter and possibly after a system failure does it provide the necessary system protection.
In most instances, the multi-pass test is completed when the element differential pressure reaches the specified limit or the Beta Ratios fall below a specified level. This is an easy way to lower the overall system price. Caution must be exercised when using beta ratios to compare filters because they do not take into account actual operating conditions such as flow surges and changes in temperature. The fluid in the injection reservoir is then pumped continuously into the clean fluid in the test reservoir, thereby creating a low concentration test solution. Absolute Rating Another common rating for filters is the absolute rating.
This allows for the Beta Ratio to be determined at different differential pressures. In some extreme cases of mis-application, this can even result in the unintentional removal of additives from oils. High levels of solid contamination are usually the result of inadequate filtration.
Modern engines are developing at an unprecedented rate and frequently require highly efficient filtration. So what does each one mean and why have so many? The test solution is filtered by the element under test and travels back to the test reservoir along with any unfiltered particles. System suppliers and purchasers often change the filter strategy by changing the filter size, micron rating and the number of filters. Likewise, the ability to change the filter on the run - often requiring the use of a duplex arrangement - is an important preinstallation consideration.
Efficiency Filter element efficiency for a particular micron rating is determined by the Beta Ratio for that micron rating. Filter elements must be compared based on the multi-pass test results. This element provides excellent contaminant protection in the beginning of the test and offers good protection at the end of the test. Nevertheless, beta ratios are an effective way of gauging the expected performance of a filter.
Filter element efficiency for a particular micron rating is determined by the Beta Ratio for that micron rating. It is important that both the micron sizing and Beta ratio is matched to the application. This cleaned fluid is contaminated again by the injection fluid, and is once again pumped to the test filter. Test dust of a known particle size distribution is added to the fluid in the injection reservoir until it reaches a specified concentration in grams of contaminant per liter of test fluid. Still, absolute ratings are better for representing the effectiveness of a filter over nominal ratings.
Essentially, this is the size of the largest opening in the filter although no standardized test method to determine its value exists. To test a filter, particle counters accurately measure the size and quantity of upstream particles per known volume of fluid, as well as the size and quantity of particles downstream of the filter. Create your own user feedback survey. Donaldson fuel, lube oil, coolant and hydraulic filters are engineered to meet the specific requirements of equipment manufacturers and are required to have exacting efficiency ratings.
Understanding Beta Ratings of Liquid Filters
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