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随着液压工业的发展，液压系统越来越复杂、精密和高性能，同时对液压油液的清洁度要求也越来越高，如液压系统对尺寸在５μｍ或更小的胶质颗粒就很敏感。统计表明，液压系统７５％以上的故障起源于油液的颗粒污染，因此对油液污染状况进行测定便成为液压工业发展的一个重要课
With the development of the hydraulic industry, the hydraulic system is more and more complicated, sophisticated and high-performance. Meanwhile, the requirements on the cleanliness of the hydraulic fluid are also getting higher and higher. For example, the hydraulic system is very suitable for colloidal particles with a size of 5 μm or less sensitive. Statistics show that more than 75% of the hydraulic system failures originated from the oil particles of pollution, so the oil pollution status has become an important part of the hydraulic industry development