ISO 4407:2002 液压传动.液压液污染.用显微镜计数法测定粒状物污染

标准编号：ISO 4407:2002

中文名称：液压传动.液压液污染.用显微镜计数法测定粒状物污染

英文名称：Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the counting method using an optical microscope

发布日期：2002-04

标准范围

本国际标准规定了通过使用光学显微镜计算沉积在膜过滤器表面的颗粒数量来确定液压系统中使用的液体中颗粒污染水平的方法。它包括通过两种手动方法进行粒子计数，以及使用透射或入射照明系统进行图像分析。通过这种方法可以确定和计算大于或等于2微米的颗粒大小，但结果的分辨率和准确性将取决于使用的光学系统和操作员的能力。可根据本国际标准对污染程度范围广泛的所有液压油进行分析。然而，如果过滤的体积减小，以允许在存在细沉淀物或高颗粒浓度的情况下对较小尺寸的颗粒进行计数，则较大颗粒尺寸下的计数不确定性增加。

This International Standard specifies methods for determining the level of particulate contamination in liquids used in hydraulic systems by counting the number of particles deposited on the surface of a membrane filter using an optical microscope. It includes particle counting by two manual methods and image analysis, using either transmitted or incident lighting systems.Particle sizes greater than or equal to 2 micrometres can be sized and counted by this method, but the resolution and accuracy of the results will depend upon the optical system used and the capabilities of the operator.All hydraulic fluids with a wide range of contamination levels can be analysed according to this International Standard. However, the counting uncertainty at the larger particle sizes increases if the volume filtered is reduced to allow smaller sized particles to be counted, where a fine precipitate or a high particle concentration is present.

标准预览图