By using an optical microscope where the longest dimension sizes the particles.There are two basic methods of counting particles in hydraulic fluids. Before proceeding further, the knowledge of the following terms and definitions would be of great help in understanding various cleanliness standards. The cleanliness classes are based on particle size, number, and distribution. All standards specify the contamination level in counts per fluid volume and provide easy methods for converting the particle counts into limits that are simple to interpret. ![]() ![]() Many national and international organizations such as ISO, SAE, National Aerospace Standards (NAS), etc., have developed standards for specifying the particle size classification and contamination concentration levels in hydraulic fluids. The cleanliness of hydraulic fluids needs to be monitored for maintaining the components of hydraulic systems at a satisfactory level.
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