Standard Swedish standard · SS-ISO 4407

Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope

Status: Valid

Scope
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 >= 2 µm 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.

Subjects

Filters, seals and contamination of fluids


Product information

Language: English

Written by: SIS - Industriteknik

International title: Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope

Article no: STD-33005

Edition: 1

Approved: 10/25/2002

No of pages: 18