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:
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a) the cleanliness level of fluids circulating in hydraulic systems;
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b) the progress of a flushing operation;
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c) the cleanliness level of support equipment and test rigs;
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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.