ISO/TR 16386:2014 ISO流体パワー粒子カウントの変更の影響—汚染管理およびフィルターテスト基準 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control.

This second edition cancels and replaces the first edition (ISO/TR 16386:1999) which has been technically revised.

Introduction

This Technical Report has been prepared as an information document to give users an understanding into the background and implications of a number of new and revised contamination control standards, namely ISO 11171, ISO 11943, ISO 16889 and ISO 4406.

The adoption of four revised and updated contamination control standards, ISO 11171, ISO 11943, ISO 16889, and ISO 4406:1999, has produced significant changes in terms of how solid contamination levels and filter performance are reported.

With ISO 11171, the method of calibrating automatic particle counters (APCs) using AC Fine Test Dust (ACFTD) used since the early 1970s has been replaced by a new method traceable to the USA’s National Institute of Standards and Technology. As a result, contaminant particle sizes previously referred to as 2 μm, 5 μm, 10 μm, and 15 μm became 4 μm(c), 6 μm(c), 10 μm(c), and 14 μm(c), respectively, where (c) refers to particle sizing and counting done with an APC calibrated in accordance with ISO 11171.

ISO 11943 is a new standard for calibrating online particle counting systems that are primarily used to evaluate filter performance. With the ISO 16889 filter multi-pass test, which replaces the original ISO 4572 method, ISO Medium Test Dust (ISO MTD) replaces ACFTD as the test dust and the new ISO 11171 traceable particle counter calibration method is used. In ISO 4406:1999, the new calibration method is used, and a new 4 μm(c) size class has been added to the solid contamination code for particle counts made with an automatic particle counter.

These improvements in particle counting and filter testing have a significant impact on contamination control activities. However, it is important to note that there has been no change in the actual contamination levels or in the performance of filters, or their effectiveness in protecting the reliability of components. This Technical Report discusses what the changes are, why they were made, how they impact contamination levels and filter ratings, and how they benefit the industry.

1 Scope

This Technical Report discusses the impact of changes in International Standards for particle counting, contamination control, and filter testing.

Liquid automatic particle counters (APCs) are used in monitoring contamination levels in hydraulic fluids, to establish component and assembly cleanliness level specifications, and in determining filter efficiencies and particle size ratings. As a result of the replacement of ISO 4402 with ISO 11171 (APC calibration), the replacement of ISO 4572 with ISO 16889 (multi-pass filter test), and the publication of ISO 11943 (online particle counter calibration), the quality and reliability of particle count and filter test data have improved, increasing their usefulness to industry. However, the resultant redefinition of particle sizes and the use of a new test dust affect how contamination levels and filter performance are reported and interpreted.

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