ISO 21018-4:2019
Hydraulic fluid power — Monitoring the level of particulate contamination in the fluid — Part 4: Use of the light extinction technique
This document specifies a method for the determination of the particulate contamination level using the light extinction technique (also known as light blockage or light obscuration) either online or offline in containers. It also defines procedures for calibrating the instruments and verifying their correct operation both in the laboratory and in service.
In general, the techniques described in this document are suitable for monitoring:
— the general cleanliness level in hydraulic systems,
— the progress in flushing operations, and
— support equipment and test rigs.
The use of this method is applicable to single-phase liquid systems only.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Health and safety
5 Equipment
5.1 General
6 Operating procedures
6.1 General
6.2 Operating from a pressurized line
6.2.1 General
6.2.2 Procedure
6.3 Operating from a system reservoir
6.3.1 General
6.3.2 Procedure
6.4 Operating from a bulk container
6.4.1 General
6.4.2 Procedure
6.5 Operating from a sample bottle
6.5.1 General
6.5.2 Procedure
7 Calibration and verification procedure
7.1 General principles
7.2 Required equipment for calibration and validation as per ISO 11943
7.3 Required equipment for calibration and validation using prepared bottle samples
8 Reporting of results of calibration and verification procedure
9 Test reports
10 Identification statement
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Health and safety
5 Equipment
5.1 General
6 Operating procedures
6.1 General
6.2 Operating from a pressurized line
6.2.1 General
6.2.2 Procedure
6.3 Operating from a system reservoir
6.3.1 General
6.3.2 Procedure
6.4 Operating from a bulk container
6.4.1 General
6.4.2 Procedure
6.5 Operating from a sample bottle
6.5.1 General
6.5.2 Procedure
7 Calibration and verification procedure
7.1 General principles
7.2 Required equipment for calibration and validation as per ISO 11943
7.3 Required equipment for calibration and validation using prepared bottle samples
8 Reporting of results of calibration and verification procedure
9 Test reports
10 Identification statement
Bibliography