ISO 11943:2021 Hydraulic fluid power — Online automatic particle-counting systems for liquids — Methods of calibration and validation

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Hydraulic fluid power — Online automatic particle-counting systems for liquids — Methods of calibration and validation由国际标准化组织于2021-05-10发布，适用于国际范围。

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INTERNATIONAL STANDARD ISO 11943:2021

Hydraulic fluid power — Online automatic particle-

counting systems for liquids — Methods of calibration and validation

1 Scope

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.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 4021, Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system

ISO 5598, Fluid power systems and components — Vocabulary

ISO 11171, Hydraulic fluid power — Calibration of automatic particle counters for liquids

ISO 12103-1, Road vehicles — Test contaminants for filter evaluation — Part 1: Arizona test dust

ISO 16889, Hydraulic fluid power — Filters — Multi-pass method for evaluating filtration performance of a filter element

ISO 80000-1, Quantities and units — Part 1: General

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and ISO 11171 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

4 Units of measurements

The international system of units (SI) is used in accordance with ISO 80000-1.

ISO 11943:2021

Throughout this document, the use of µm(c) means that particle size measurements are carried out using an automatic particle counter that has been calibrated in accordance with either ISO 11171 or this document and particle size reported as defined in ISO 11171.

Previous editions of ISO 11171 allowed for calibration in µm or µm(b) notations. Conformance with ISO 11171:2020 and later requires µm(c) only.

5 Test equipment

5.1 Liquid automatic particle counters, requiring either calibration or verification, or a particle counter with two independent sensors.

5.2 A reference particle counter, which shall be calibrated with a reference material in accordance with ISO 11171.

5.3 ISO medium test dust (ISO MTD) concentrate, which shall be in accordance with ISO 12103-1, category A.3, dried at 110 °C to 150 °C for at least 1 h and for use in the test system, mixed in the test 2

fluid, mechanically agitated, then dispersed ultrasonically with a power density of 3 000 W/m to 2

10 000 W/m .

NOTE This standard test dust is used for filter test purposes in ISO 16889.

5.4 Test fluid, which shall be as specified in ISO 16889.

5.5 Hydraulic equipment, comprising:

a) a reservoir, pump, liquid temperature control system and instrumentation which are capable of meeting the validation requirements of Clause 8;

b) a clean-up filter capable of providing an initial fluid contamination level of less than 50 particles per millilitre at the smallest particle size that will be validated or less than 2 % of the expected number of counts;

c) a configuration which does not alter the contaminant distribution over the anticipated test duration (refer to ISO 16889);

d) fluid sampling sections which shall be in accordance with ISO 4021;

e) a configuration which supplies contaminated liquid to the particle counters under constant flow and temperature within the limits of Table 1.

NOTE 1 A multi-pass test rig (see ISO 16889) can be used provided it has been validated in accordance with Clause 8.

NOTE 2 An alternative typical configuration which has proven satisfactory is given in Annex A.

5.6 Hydraulic circuit, containing dilution equipment, if required, for online counter adaptation to a filter multi-pass test stand.

For typical hydraulic circuit configurations which have proven satisfactory, refer to Annex B.

6 Accuracy of measuring equipment and test conditions

6.1 Utilize measuring equipment with an accuracy within the limits in Table 1.

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