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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

Standard Details

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:

a)       the cleanliness level of fluids circulating in hydraulic systems;

b)       the progress of a flushing operation;

c)        the cleanliness level of support equipment and test rigs;

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 APC coincidence error limits are exceeded.

General Information

Status : Published
Standard Type: Main
Document No: ISO 11500:2022
Document Year: 2022
Pages: 20
Edition: 3
  • ICS:
  • 23.100.60 Filters, seals and contamination of fluids

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ISO 11500:2022
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