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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

21-05-2002

Publisher

British Standards Institution

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Counting principle
5 Apparatus
6 Reagent and chemicals
   6.1 Reagent and rinsing and cleaning chemicals
   6.2 Liquids for transparentizing the membrane filter
       (transmitted-light method)
7 Glassware cleaning procedure
8 Calibration procedures
   8.1 Microscope calibration
   8.2 Determination of Effective Filtration Area (EFA)
9 Membrane filter preparation
   9.1 Sample preparation
   9.2 Blank analysis
   9.3 Separation of contaminants by vacuum filtration
   9.4 Evaluation of suitability for counting
   9.5 Mounting of membrane filters for observation under
       transmitted light
10 Particle sizing and counting procedure
   10.1 Particle sizing
   10.2 Selection of nominal magnification
   10.3 Statistical counting procedure
   10.4 Calculation of total count
   10.5 Verification of data
11 Expression of results
12 Identification statement (Reference to this International
   Standard)
Bibliography

Describes 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 also includes particle counting by two manual methods and image analysis, using either transmitted or incident lighting systems.

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≥2µm 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.

Committee	MCE/18/-/6
DevelopmentNote	Supersedes BS 5540-8(1991) (06/2002)
DocumentType	Standard
Pages	24
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 5540-8:1991

Standards	Relationship
ISO 4407:2002	Identical

BS 8465:2010

Hydraulic fluid power. Monitoring the level of particulate contamination. Comparison membrane technique

ISO 5598:2008	Fluid power systems and components Vocabulary
ISO 4788:2005	Laboratory glassware Graduated measuring cylinders
ISO 3722:1976	Hydraulic fluid power — Fluid sample containers — Qualifying and controlling cleaning methods
ISO 14644-1:2015	Cleanrooms and associated controlled environments Part 1: Classification of air cleanliness by particle concentration
ISO 4021:1992	Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system

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BS ISO 4407:2002

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

Table of Contents

Abstract

Scope

General Product Information

International Equivalents

Standards Referenced By This Book

Standards Referencing This Book

Category

Subcategory