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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Strategies to Protect Grease 1688 from Contaminants. It also enables the user to discriminate between elements that achieve the desired control and those that do not.

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. Therefore, the desired level of control will not be achieved.

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.

However because of particle count statistics in the multi-pass test, the absolute rating cannot be measured with any degree of confidence. The data that can be made available is as follows: Current Issue Archive Advertise. 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.

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Hydraulik├Âl-Filtrationssysteme | Donaldson Hydraulik

Create your own user feedback survey. This demands care in the selection of the most appropriate filter for the system. The Beta ratio is defined as: To appreciate the importance of the filter in the management of the system, consider the primary function of the filter: Consequently, the number of different Beta ratings used has proliferated.

Most manufacturers published ratings at other sizes but there was no consistency. 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 isoo appropriate filter for his system.

It is a preselection requirement ieo provides the user and specifier of filter standards with more consistent information.

Particles entering component working clearances will become work hardened and produce more wear particles. This gives a series of Beta ratios for the filter as opposed to a percentage efficiency.

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 group also stipulated that detailing comprehensive performance data was necessary so users can make informed selections. It is able to control the critically sized particles better than Element B. 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.

Clarifying the New ISO Contamination Filtration Standards

18689 The changes in the ISO multi-pass test method and associated standards provide greater precision in measurement. Now, users can quickly see how the filter performs over a specified range of particle sizes and can compare the performance of candidate elements. This makes the capture of these particles, by the filter, essential 166889 sustain the good health of the system. This article will focus on the impact the new standards have on selecting candidate filters based on performance criteria.

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It should allow fluid to pass through at the given flow with the minimum pressure drop DP to minimize stress and energy losses.

Users were often confused when comparing performance data of seemingly identical filters.

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. Toggle navigation Toggle search. This will be through the larger pores in the medium and any holes created by poor manufacturing techniques.

While primarily developed for fluid power, the new standards are equally applicable to the lubricating oil sector. However, the multi-pass test is carried out in a laboratory under steady-state conditions and does not represent strenuous operational conditions.

This is essential to achieve the required 116889 reliability and life. The Best Gets Better:

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