La présente norme fait partie d'un ensemble de normes françaises destinées à mesurer la pollution des fluides utilisés dans les transmissions hydrauliques. La méthode de comptage au microscope est importante car, bien que relativement longue et coûteuse, elle représente "la méthode de référence" permettant de juger les autres méthodes.
<p>This International Standard specifies methods for determining the level of particulate contamination in liquids used in hydraulic systems by counting the number of particles deposited on the surface of a membrane filter using an optical microscope. It includes particle counting by two manual methods and image analysis, using either transmitted or incident lighting systems.</p> <p>Particle sizes greater than or equal to 2 micrometres can be sized and counted by this method, but the resolution and accuracy of the results will depend upon the optical system used and the capabilities of the operator.</p> <p>All hydraulic fluids with a wide range of contamination levels can be analysed according to this International Standard. However, the counting uncertainty at the larger particle sizes increases if the volume filtered is reduced to allow smaller sized particles to be counted, where a fine precipitate or a high particle concentration is present.</p>
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