EN 60970:2007

Insulating liquids - Methods for counting and sizing particles

Publication date:   Nov 30, 2007

General information

60.60 Standard published   Aug 31, 2007

CENELEC

CLC/SR 10 Fluids for electrotechnical applications

European Norm

17.220.99   Other standards related to electricity and magnetism | 29.040.10   Insulating oils

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Scope

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.

Life cycle

NOW

PUBLISHED
EN 60970:2007
60.60 Standard published
Aug 31, 2007

CORRIGENDA / AMENDMENTS

PUBLISHED
EN 60970:2007/corrigendum Jan. 2008