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Each class defines a range of counts These sizes are translated to ISOMTD sizes for ISOMTD calibrated units versus NAS The recommended standard for definition of oil cleanliness level is ISO If NAS is used, the number of particles in a ml sample larger than NAS is comprised of fluid cleanliness classes, each class defined in terms of maximum allowed particle counts for designated particle size ranges. worst case) for designated particle Purity classes according to NAS The determination of purity classes according to NAS (National Aerospace Standard) is due to the requirements for modern hydraulic systems of aircraft. These sizes are translated to ISOMTD sizes for ISOMTD calibrated units. See below. Class Maximum The NAS cleanliness standard was developed for aerospace components in the US and is still widely used for industrial and aerospace fluid power applications. Reports classification codes per the NAS standardSAE AS – Displays cumulative counts per milliliters for theμm(c),μm(c),μm(c),μm(c) nasFree download as PDF File.pdf), Text File.txt) or read online for free. The figures are differential counts, and the NAS class is usually reported as a single figure representing the maximum allowed particle counts (i.e. A particle count will show up to have almost the same NAS class rating within the different particle ranges. The NAS cleanliness standard was developed for aerospace components in the US and is still widely used for industrial and aerospace fluid power applications. The NAS system specifies different counts within each particle range to score a specific class. The figures Purity classes according to NAS The determination of purity classes according to NAS (National Aerospace Standard) is due to the requirements for modern hydraulic NAS – Displays differential counts per milliliters for the 5,,,, and μm sizes. National Aerospace Standard NAS (National Aerospace standard) The NAS system divides particles inparticle size ranges. Compared to the ISO standard, NAS also distinguishes particles larger thanμm NAS – Displays differential counts per milliliters for the 5,,,, and μm sizes.
