NBN EN 1839:2012

This European Standard specifies two test methods (method T and method B) to determine the explosion limits of gases, vapours and their mixtures, mixed with air. An air/inert gas mixture (volume fraction of the oxygen < 21 %) can be used as the oxidizer instead of air. In this European Standard, the term "air" includes such air/inert mixtures.
This European Standard applies to gases, vapours and their mixtures at atmospheric pressure for temperatures up to 200 °C.