ISO/WD 4021
Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system
Reference number
ISO/WD 4021
Edition 3
Working draft
ISO/WD 4021
A working group has prepared a draft.
Will replace ISO 4021:1992


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.

General information

  •  : Under development
    : Close of comment period [20.60]
  •  : 3
  • ISO/TC 131/SC 6
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