ISO 16889 PDF

ISO HYDRAULIC FLUID POWER – FILTERS – MULTI-PASS METHOD FOR EVALUATINGFILTRATION PERFORMANCE OF A FILTER ELEMENT. Introduction. The obsolescence of AC Fine test dust (ACFTD) has led to the adoption of a new test dust, ISO Medium Test. Dust (ISO MTD), and the impending. ISO Multi-Pass Test. The multi-pass test is a means of determining a filter’s performance; it measures the ability of the filter to remove particles of test dust.

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This gives a series of Beta ratios for the filter as opposed to a percentage efficiency.

Clarifying the New ISO Contamination Filtration Standards

More detailed information from the test iwo to be published than previously required. However, the multi-pass test is carried out in a laboratory under steady-state conditions and does not represent strenuous operational conditions. Now, users can quickly see how the filter performs over a specified range of particle sizes and can compare the performance of candidate elements. While primarily developed for fluid power, the new standards are equally applicable to the lubricating oil sector.

It is able to control the critically sized particles better than Element B.

The data that can be made available is as follows:. This is essential to achieve the required system reliability and life. Therefore, iiso desired level of control will not be achieved. Therefore, the highest Beta ratio that can be reliably measured should be selected. In the s and s, a compromise was reached between what is desirable and what can be consistently achieved for the range of filters assessed by this test.


Users were often confused when comparing performance data of seemingly identical filters. It is a preselection requirement that provides the user and specifier of filter standards with more consistent information.

This article will focus on the impact the new standards have on selecting candidate filters based on performance criteria. To appreciate the importance of the filter in the management of the system, consider the primary function ios the filter: Particles entering component working clearances will become work hardened and produce ieo wear particles.

The data that can be made available is as follows: The Best Gets Better: The Beta ratio is defined as:. Ixo also enables the user to discriminate between elements that achieve the desired control and those that do not. This makes the capture of these particles, by the filter, essential to sustain the good health of the system. About the Author Mike Day. The Role of the Filter To appreciate the importance of the filter in the management of the system, consider the primary function of the filter: The slope of the curve effectively defines the pore size distribution PSD of the filtration medium; oso wider the PSD the less able the filter is to control those critically sized damaging particles.

The group also stipulated that detailing comprehensive performance data was necessary so users can make informed selections.

Strategies to Protect Grease Fittings from Contaminants. This will be through the larger pores in the medium and any holes created by poor manufacturing techniques. Create your own user feedback survey.


These standards have been developed to increase the precision in the measurement of contamination and filtration performance, and to extend the amount of information from the tests. The effectiveness of the hydraulic filter to control clearance-sized particles is essential if the desired level of reliability is to be realized in the hydraulic system concerned. The changes in the ISO multi-pass test method and associated standards provide greater precision in measurement.


Clarifying the New ISO Contamination Filtration Standards

Toggle navigation Toggle search. Users of filters have historically liked the simplicity of a single point rating the size where a specified Beta ratio is attained.

This demands care in the selection of the most appropriate filter for the system. What value is most appropriate? A filter must control the levels of all contaminant particles at and above the size critical to its operating system.

Hydraulik├Âl-Filtrationssysteme | Donaldson Hydraulik

It should allow fluid to pass through at the given flow with the minimum pressure drop DP to minimize stress and energy losses. Figure 2 shows the advantages of this approach. Current Issue Archive Advertise. The Beta ratio isso defined as: It is only when the ratings at higher Beta ratings are considered that the differences in performance are clearly seen.

The current data requirement is a substantial improvement.