ISO 11943:2021
Hydraulic fluid power — Online automatic particle-counting systems for liquids — Methods of calibration and validation
This document establishes methods for:
— validating equipment used to prepare secondary calibration suspensions for automatic particle counters;
— performing online secondary calibration of automatic particle counters;
— matching two or more online particle counters, i.e. to count the same number of particles at a given size by two APCs associated online;
— validating online particle counting systems with and without online dilution as used, for example, to measure the filtration efficiency of a hydraulic filter as described in the multi-pass filter test in ISO 16889.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units of measurements
5 Test equipment
6 Accuracy of measuring equipment and test conditions
7 Offline APC calibration procedure
8 Validation of online hydraulic equipment
9 Online secondary calibration of automatic particle counter
10 Matching of two or more particle counters
11 Validation of an online dilution and particle counting system
12 Precautions
13 Identification statement
Annex A (informative) Typical online calibration and validation system design information guidance
Annex B (informative) Hydraulic circuit design guidance for online counter adaptation to a multi-pass test stand
Annex C (informative) Summary of ISO interlaboratory study for online calibration and validation
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units of measurements
5 Test equipment
6 Accuracy of measuring equipment and test conditions
7 Offline APC calibration procedure
8 Validation of online hydraulic equipment
9 Online secondary calibration of automatic particle counter
10 Matching of two or more particle counters
11 Validation of an online dilution and particle counting system
12 Precautions
13 Identification statement
Annex A (informative) Typical online calibration and validation system design information guidance
Annex B (informative) Hydraulic circuit design guidance for online counter adaptation to a multi-pass test stand
Annex C (informative) Summary of ISO interlaboratory study for online calibration and validation
Bibliography