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

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.

View the extract

Main informations

Collections

National standards and national normative documents

Publication date

September 2002

Number of pages

21 p.

Reference

NF ISO 4407

ICS Codes

23.100.60 Filters, seals and contamination of fluids

75.120 Hydraulic fluids

Classification index

E48-651

Print number

1 - 07/12/2002

International kinship

ISO 4407:2002

Sumary

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

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.

Replaced standards (1)

NF E48-651

October 1986

Standard Cancelled

Hydraulic fluid power. Fluids. Determination of particulate contamination by the counting method using a microscope.

La présente norme fait partie d'un ensemble de normes françaises destinées à mesurer la pollution des fluides utilisés dans les transmissions hydrauliques. La méthode de comptage au microscope est importante car, bien que relativement longue et coûteuse, elle représente "la méthode de référence" permettant de juger les autres méthodes.

Table of contents

View the extract

Avant-propos
iv
Introduction
v
1 Domaine d'application
1
2 Références normatives
1
3 Termes et définitions
2
4 Principe de comptage
4
5 Appareillage
4
6 Réactif et produits chimiques
6
6.1 Réactif et produits chimiques de rinçage et de nettoyage
6
6.2 Liquides de transparisation de la membrane filtrante (méthode en lumière transmise)
6
7 Mode opératoire de nettoyage de la verrerie
7
8 Méthodes d'étalonnage
7
8.1 Étalonnage du microscope
7
8.2 Détermination de la surface utile de filtration (SUF)
7
9 Préparation de la membrane filtrante
8
9.1 Préparation de l'échantillon
8
9.2 Analyse à blanc
8
9.3 Séparation des polluants par filtration sous vide
9
9.4 Évaluation de l'aptitude au comptage
10
9.5 Montage des membranes pour observation en lumière transmise
10
10 Classification des particules et méthode de comptage
11
10.1 Classification des particules
11
10.2 Choix du grossissement nominal
11
10.3 Méthode de comptage statistique
11
10.4 Calcul du nombre total
12
10.5 Vérification des résultats
13
11 Expression des résultats
14
12 Phrase d'identification (Référence à la présente Norme internationale)
14
Bibliographie
15

ZOOM ON ... the Requirements department

To comply with a standard, you need to quickly understand its issues in order to determine its impact on your activity.

The Requirements department helps you quickly locate within the normative text:
- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.

The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.

With Requirements, quickly access the main part of the normative text!

With Requirements, quickly access the main part of the normative text!

Need to identify, monitor and decipher standards?

COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.

Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!

Request your free, no-obligation live demo

I discover COBAZ