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ISO 11500

2nd Edition, September 1, 2008

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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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Description / Abstract:

This International Standard 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 International Standard 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.

NOTE 1 Measurements can be made with particles suspended in the original liquid or in a sample of the liquid diluted with a compatible liquid to reduce coincidence error.

NOTE 2 The presence of a fluid interface obstructs the light beam and gives false signals.

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