標準號：ISO 4407-2002
中文標準名稱：液壓傳動 液體污染 采用光學顯微鏡測定顆粒污染度的方法
英文標準名稱：Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope
標準類型：J20
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：J20
國際標準分類號：23.100.60
適用范圍：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.