Alcance
ISO 21018-4:2016 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 off-line 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 ISO 21018-4:2016 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.