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  • SN EN 61868 : 1999

    Current The latest, up-to-date edition.
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    MINERAL INSULATING OILS - DETERMINATION OF KINEMATIC VISCOSITY AT VERY LOW TEMPERATURES

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    Published date:  12-01-2013

    Publisher:  Swiss Standards

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    Table of Contents - (Show below) - (Hide below)

    Introduction
    1 Scope
    2 Normative references
    3 Definitions
    4 Principle
    5 Apparatus
    6 Calibration
    7 Procedure
    8 Expression of results
    Figure 1 - Viscometer bath and accessories

    Abstract - (Show below) - (Hide below)

    Defines a procedure for the determination of the kinematic viscosity of mineral insulating oils, both transparent and opaque, at very low temperatures, after a cold soaking period of at least 20 h, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer. Applicable at all temperatures to both non-Newtonian and Newtonian liquids having viscosities of up to 20 000 mm2 x s-1. Suitable for the measurement of the kinematic viscosity of liquids for use in cold climates, at very low temperatures (-40 or at temperatures between the cloud and pour-point temperatures (typically -20C) where some liquids may develop unexpectedly high viscosities under cold soak conditions.

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    Document Type Standard
    Publisher Swiss Standards
    Status Current
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