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This Document Has Been Superseded
A newer publication replaces it: BSI BS ISO 4407
Evaluating particulate contamination of hydraulic fluids -- Method of determining the level of contamination (by the counting method using a microscope)
METHOD OF DETERMINING THE LEVE
Method whereby the amount of solid contaminant in a sample of hydraulic fluid can be determined.
The principle involves filtering a known volume of the sample and then counting the number of particles on the surface of the filter using a microscope.
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