4/7/2024 0 Comments Iso cleanliness standards![]() ![]() An added benefit of the vacuum patch kit is that it can help you identify the source of contamination based on the material viewed via the microscope. ![]() It’s actually sort of fun, but requires more effort and is more ambiguous that the laser particle counters. The vacuum patch test kits include pictures of patch samples at various ISO codes and you, via a microscope, visually match your patch to closest ISO rated sample. Directly connecting an online laser particle counter to the hydraulic system through sample ports provides the most accurate analysis of the cleanliness as it provides the exact ISO count with little effort. The two most common methods of calculating your fluid’s ISO code are the laser particle counter and the vacuum patch test (aka black and white pull down test). The ISO cleanliness code of 16/14/11 or better is the target for this system. The most sensitive component in the group is the servo valve. Example: Among many components, a given system may have a servo valve 16/14/11, a vane pump 18/16/13 and a cylinder 17/15/12 (codes based on industry standards). ![]()
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