IEC 60970:2007

Title

Language: EN Insulating liquids - Methods for counting and sizing particles

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

Abstract

Language: EN 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.

Language(s)
Language: EN Language: FR
Edition
2.0
Date of issue
16.07.2007
TC 10
ICS Codes
17.220.99, 29.040.10
Publication number
60970
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