ISO 16889 PDF

Published by on December 28, 2019
Categories: Automotive

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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The filter should control the fluid cleanliness to a level that is equal to the performance, life and reliability of the system required by the user. Create your own user feedback survey. Now, users can quickly see how the filter performs over a specified range of particle sizes and can compare the performance of candidate elements. It is a preselection requirement that provides the user and specifier of filter standards with more consistent information.

While primarily developed for fluid power, the new standards are equally applicable to the lubricating oil sector.

Clarifying the New ISO Contamination Filtration Standards

Toggle navigation Toggle search. 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.

The need to remove particles consistently across a wide size range was recognized by the ISO Working Group responsible for updating the multi-pass filter test. The Beta ratio is defined as: This makes the capture of these particles, by the filter, essential to sustain the good health of the system.

Consequently, the number of different Beta ratings used has proliferated. However because of particle count statistics in the multi-pass test, the absolute rating cannot be measured with any degree of confidence.

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Users were often confused when comparing performance data of seemingly identical filters. Users of filters have historically liked the simplicity of a single point rating the size where a specified Beta ratio is attained.

If the filter fails to provide the necessary control of damaging-sized particles, then their presence in the system will lead to a substantial increase in the number of particles generated within the system through a chain reaction of wear. It is only when the ratings at higher Beta ratings are considered that the differences in performance are clearly seen.

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 Beta ratio is defined as:.

This article will focus on the izo the new standards have on selecting candidate 166889 based on performance criteria.

Particles entering component working clearances will become work hardened and produce more wear particles. Additionally, the user can have greater assurance and confidence in the data, and designers or specialists can make a more informed judgment in the selection of the most appropriate filter for his system.

It has to protect the components from the damaging, critical clearance-sized particles particles that can penetrate and interfere with the working clearances of components. Most manufacturers published ratings at other sizes but there was no consistency. It also enables the user to discriminate between elements that achieve the desired control and those that do not.

To appreciate the importance of the filter in the management of the system, consider the primary function of the filter: Therefore, the desired level of control will not be isso. The data that can be made available is as follows:. The changes in the ISO multi-pass test method and associated standards provide greater iwo in measurement. In the s and s, a compromise was reached between what is desirable and what oso be consistently achieved for the range of filters assessed by this test.

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The Best Gets Better: It is able to control the critically sized particles better than Element B. What value is most appropriate? Current Issue Archive Advertise. However, the multi-pass test is carried out in a laboratory under steady-state conditions and sio not represent strenuous operational conditions.

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. About the Author Mike Day.

Clarifying the New ISO Contamination Filtration Standards

This will be through the larger pores in the medium and any holes created by poor manufacturing techniques. The current data requirement 168889 a substantial improvement.

This demands care in the selection of the most appropriate filter for the system. The group also stipulated that detailing comprehensive performance data was necessary so users can make informed selections. 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. When isp contaminated hydraulic fluid passes through the filtration medium, it takes the line of least resistance.

Therefore, the highest Beta ratio that can be reliably measured should be selected.