SIST ISO 4407:2003
Hydraulic fluid power -- Fluid contamination -- Determination of particulate contamination by the counting method using an optical microscope
Hydraulic fluid power -- Fluid contamination -- Determination of particulate contamination by the counting method using an optical microscope
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 14
- Дата публикации:
- 1 июля 2003 г.
- ICS:
- 23.100.60
- Технический комитет:
- IHPV - Hydraulics and pneumatics
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.
Abstract
Overview
ISO 4407:2002 - Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope - defines standardized laboratory procedures to quantify particulate contamination in hydraulic fluids. The method separates particles by vacuum filtration onto a membrane filter and sizes/counts them microscopically using manual counting (two methods) or image analysis with either transmitted or incident lighting. The technique reliably sizes particles ≥ 2 µm, though resolution depends on the optical system and operator skill.
Key topics and technical requirements
- Counting principle: Vacuum filtration of a known sample volume onto a membrane filter followed by microscopic sizing/counting by particle longest dimension.
- Particle size threshold: Particles ≥ 2 µm can be sized and counted; accuracy depends on optics and operator.
- Counting methods: Two manual methods and computerized image analysis (video camera + software). Both transmitted- and incident-light observation are specified.
- Membrane filters: Typical recommendation - 47 mm diameter, white, gridded (grid ~3.08 mm sides) for manual counting; ungridded preferred for image analysis. Pore size generally
Технические детали
- SKU
- SIST ISO 4407:2003
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