ISO 4021:1992 Preview
Hydraulic fluid power -- Particulate contamination analysis -- Extraction of fluid samples from lines of an operating system
This standard was last reviewed and confirmed in 2018. Therefore this version remains current.
The preferred method is to extract fluid samples from a main flowline in such a manner that the particulate contaminant in the sample is representative of the fluid flowing at the point of sampling. An alternative method is to extract a sample from the reservoir, but this method should only be used if a suitable sampler is not fitted.
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