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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In the s is s, a compromise was reached between what is desirable and what can be consistently achieved for the range of filters assessed by this isl. Users were often confused when comparing performance data of seemingly identical filters. It is able to control the critically sized particles better than Element B. 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.

This will be through the larger pores in the medium and any holes created by poor manufacturing techniques. The data that can be made available is as follows:.

Users of filters have historically liked the simplicity of a single point rating the size where a specified Beta ratio is attained. The Beta ratio is defined as: Create your own user feedback survey.

When the contaminated hydraulic fluid passes through 1688 filtration medium, it takes the line of least resistance. It is a preselection requirement that provides the user and specifier of filter standards with more consistent information.


The group also stipulated that detailing comprehensive performance data was necessary so users can make informed selections. This makes the capture of these particles, by the filter, essential to sustain the good health of the system. This demands care in the selection of the most appropriate filter for the system. Figure 2 shows the advantages of this approach.

It should allow fluid to pass through at the given flow with the minimum pressure drop DP to minimize stress and energy losses. A filter must control the levels of all contaminant particles at and above the size critical to its operating system. Strategies to Protect Grease Fittings from Contaminants. More detailed information from the test has to be published than previously required.

Toggle navigation Toggle search. The Best Gets Better: This iao essential to achieve the required system reliability and life.

About the Author Mike Day. The data that can be made available is as follows: The more critical the system, the stronger the filter element and the more frequent the monitoring required. The slope of the curve effectively defines the pore size distribution PSD of the filtration medium; the wider the PSD the less able the filter is to control those critically sized damaging particles.

Clarifying the New ISO Contamination Filtration Standards

It is only when the ratings at higher Beta ratings are considered that the differences in performance are clearly seen. This gives a series of Beta ratios for the filter as opposed to a percentage efficiency. However because of particle count statistics in the multi-pass test, the absolute rating cannot be measured with any isl of confidence.


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.

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 also enables the user to discriminate between elements that achieve the desired control and those that do not. This article will 166889 on the impact the new standards have on selecting candidate filters based on performance criteria. The changes in the ISO multi-pass test method and associated standards provide greater precision in measurement. Most manufacturers published ratings at other sizes but there was no consistency.

Clarifying the New ISO Contamination Filtration Standards

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