Insulating liquids - Methods for counting and sizing particles

Describes the sampling procedures and methods for the determination of particle concentration and size distribution. Three methods are specified. One uses an automatic particle size analyser, working on the light interruption principle. The other two use an optical microscope, in either the transmitted light or incident light mode, to count particles collected on the surface of a membrane filter. The optical microscope methods are described in ISO 4407. All three methods are applicable to both used and unused insulating liquids. Annex A contains an alternative sampling procedure using a syringe and Annex B reports a reference for the calibration of automatic particle counters. The significant technical changes with respect to the previous edition are as follows: - new calibration procedures for automated laser particle; - three figures contamination code; - new procedure of sample pre-treatment when automated laser counter method are used.

Isolierflüssigkeiten - Verfahren zur Bestimmung der Anzahl und Größen von Teilchen

Isolants liquides - Méthodes de détermination du nombre et de la taille des particules

Décrit les procédures de prélèvement et les méthodes pour déterminer la concentration des particules et la répartition selon leur taille. Trois méthodes sont recommandées. L'une d'entre elles utilise un analyseur automatique de particules, dont le principe repose sur l'interruption d'un faisceau lumineux. Les deux autres utilisent un microscope optique, en mode soit de lumière transmise soit de lumière incidente, pour compter les particules retenues à la surface d'une membrane filtrante. Les méthodes au microscope optique sont décrites dans l'ISO 4407. Ces trois méthodes sont applicables tant aux isolants liquides usagés qu'aux isolants liquides neufs. L'Annexe A comporte une autre procédure d'échantillonnage utilisant une seringue et l'Annexe B indique une référence pour l'étalonnage des compteurs automatiques de particules. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes: - nouvelles procédures d'étalonnage pour les analyseurs automatiques de particules; - code de contamination à trois chiffres; - nouvelle procédure pour le pré-traitement d'échantillons quand la méthode des compteurs de particules automatisés est utilisée.

Izolacijske tekočine – Metode za štetje in ugotavljanje velikosti delcev (IEC 60970:2007)

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SIST EN 60970:2007

Insulating liquids - Methods for counting and sizing particles
Isolierflüssigkeiten - Verfahren zur Bestimmung der Anzahl und Größen von Teilchen
Isolants liquides - Méthodes de détermination du nombre et de la taille des particules
Ta slovenski standard je istoveten z: EN 60970:2007
17.220.99 Drugi standardi v zvezi z Other standards related to
elektriko in magnetizmom electricity and magnetism
29.040.01 Izolacijski fluidi na splošno Insulating fluids in general
SIST EN 60970:2007 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60970:2007

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SIST EN 60970:2007

EN 60970

August 2007

ICS 17.220.99. 29.040.10

English version

Insulating liquids -
Methods for counting and sizing particles
(IEC 60970:2007)

Isolants liquides -  Isolierflüssigkeiten -
Méthodes de détermination du nombre Verfahren zur Bestimmung der Anzahl
et de la taille des particules und Größen von Teilchen
(CEI 60970:2007) (IEC 60970:2007)

This European Standard was approved by CENELEC on 2007-08-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60970:2007 E

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SIST EN 60970:2007
EN 60970:2007 - 2 -
The text of document 10/695/FDIS, future edition 2 of IEC 60970, prepared by IEC TC 10, Fluids for
electrotechnical applications, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60970 on 2007-08-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-08-01
Annex ZA has been added by CENELEC.
Endorsement notice
The text of the International Standard IEC 60970:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60422 NOTE Harmonized as EN 60422:2006 (not modified).
ISO 4402 NOTE Harmonized as EN ISO 14402:1999 (not modified).

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SIST EN 60970:2007
- 3 - EN 60970:2007

Annex ZA

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

Publication Year Title EN/HD Year
- - Insulating oil - Determination of fibre EN 50353 -
contamination by the counting method using
a microscope

IEC 60475 - Method of sampling liquid dielectrics - -

ISO 4406 - Hydraulic fluid power - Fluids - Method for - -
coding the level of contamination by solid

ISO 4407 - Hydraulic fluid power - Fluid contamination - - -
Determination of particu

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