ISO 11500:2022

Current Revision
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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ISO 11500:2022

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

PUBLISH DATE 2022
ISO 11500:2022

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:

  • the cleanliness level of fluids circulating in hydraulic systems;
  • the progress of a flushing operation;
  • the cleanliness level of support equipment and test rigs;
  • 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 APC coincidence error limits are exceeded.

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