PD ISO/TR 16386:2014

Foreword
Introduction
1 Scope
2 Historical background
3 New test dusts
4 New APC calibration procedure
5 Why changes were necessary
6 Impact on particle sizes and contamination
  measurements
7 Impact on filter test results
8 Conclusion
Bibliography

Defines the impact of changes in International Standards for particle counting, contamination control, and filter testing.

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 ISO4402 with ISO11171 (APC calibration), the replacement of ISO4572 with ISO16889 (multi-pass filter test), and the publication of ISO11943 (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.

NOTE The first editions of ISO11171, ISO16889 and ISO11943 were published in 1999; all three of these International Standards either have been, or are in the process of being, revised.