DIN EN 61868 VDE 0370-15:1999-12

The document specifies 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. It is applicable at al temperatures to both Newtonian and non-Newtonian liquids having viscosities of up to 20000 mm2 × s-1. It is particularly suitable for the measurement of the kinematic viscosity of liquids for use in cold climates, at very low temperatures (- 40 °C) or at temperatures between the cloud and pour-point temperatures (typically - 20 °C) where some liquids may develop unexpectedly high viscosities under cold soak conditions.