![]() ![]() Therefore, only an approximate assignment between NAS and ISO is possible for unknown particle numbers (see table below). OELCHECK can determine the purity class according to both ISO 4406 and SAE 4059 and determines the purity classes for mineral and biodegradable hydraulic oils, among others, starting with analysis kit 2. NAS counts differentially (each column by itself).ISO counts cumulatively (adds up) all particles.ISO also counts particles smaller than 5μm The new ISO 4406 cumulatively counts particles >4, >6 and >14m The old ISO 4406 cumulatively counts particles (>2), >5 and >15m NAS 1638 differentially."NAS 9".Īn exact assignment between NAS class and ISO purity class and vice versa is not possible due to the different counting methods: ![]() The highest of the 5 determined NAS numbers results in the NAS class, e.g. With the NAS 1638, an NAS number (0 to 12) is determined for each of the 5 counting ranges. In the case of an indicationwith 2 numbers, such as "15/12", the smallest ISO size class is not taken into account because, for example, the particles were counted optically using a microscope. The indication of the purity class according to ISO is carried out in 3 classes, for example with "20/15/12", where each number stands for one of the 3 counting classes. The old ISO 4406 cumulatively counts particles (>2), >5 and >15μm.The new ISO 4406 cumulatively counts particles >4, >6 and >14μm. #Iso 4406 to nas 1638 conversion codeAn ISO 4406 code is always shown with the micron sizes listed from smallest to largest. Unlike NAS 1638, which categorized all particle counts for the various classifications with a single number, ISO 4406 represented each size individually. However, the two methods NAS and ISO differ considerably in the evaluation of the measured particle numbers: The representative particle sizes chosen were 2, 5 and 15 microns with the 2-micron category being optional. While the specification of cleanliness classes according to the ISO 4406 standard is predominant in Europe, in the USA the NAS 1638 standard is common. With the number of particles determined for certain particle sizes, such as 5μ, assigned cleanliness classes can be specified. A particle count is performed to assess the purity of an oil. Many machine failures are due to contamination of the oil. ![]()
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