Hydraulic fluid power. Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle

Hydraulic fluid power. Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle

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1   Scope

This document specifies an automatic particle counting procedure for determining the number and sizes of particles present in hydraulic-fluid bottle samples of clear, homogeneous, single-phase liquids using an automatic particle counter (APC) that works on the light-extinction principle.
This document is applicable to the monitoring of:
  1. a) the cleanliness level of fluids circulating in hydraulic systems;
  2. b) the progress of a flushing operation;
  3. c) the cleanliness level of support equipment and test rigs;
  4. d) the cleanliness level of packaged stock fluid.

NOTE Measurements can be made with particles suspended in the original liquid or in a sample of the liquid diluted with a compatible liquid when APCcoincidence error limits are exceeded.