BS ISO 4407-2002 液压流体动力.流体污染.用光学显微镜计数法测定粒状物污染

标准号：BS ISO 4407-2002
中文标准名称：液压流体动力.流体污染.用光学显微镜计数法测定粒状物污染
英文标准名称：Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope
标准类型：J20
发布日期：2002/5/21 12:00:00
实施日期：2002/5/21 12:00:00
中国标准分类号：J20
国际标准分类号：23.100.60
适用范围：This International Standard specifies methods for determining the level of participate 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 ≥ 2 μn can be sized and counted by this method, but the resolution and accuracy of the results wiB 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.