Standard

IEC 60970:2007 ED2

Jul 2007 Current

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Language English/French

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Abstract

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.

Products specifications

Standard from IEC
Published: July 16 2007
Edition: 2
Document type: IS
Pages
ISBN: 2831892317

Publisher: IEC
Distributor: IEC
ICS: 17.220.99
ICS: 29.040.10
International TC: TC 10

Product Relations

Revises: IEC 60970:1989 ED1

IEC 60970:2007 ED2

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