scope:

This European Standard specifies test methods and performance requirements for portable, transportable and fixed electrical apparatus for the measurement of the oxygen concentration in gas mixtures indicating up to 25 % (v/v). In the case of inert gas purging (inertization), it applies also to apparatus with an oxygen measuring function for explosion protection. This European Standard is applicable to oxygen alarm apparatus intended to measure reliably the oxygen concentration, to provide an indication, alarm or other output function, the purpose of which is to give a warning of a potential hazard and, in some cases, to initiate automatic or manual protective action(s), whenever the level exceeds or falls below a preselected alarm concentration. It is applicable to apparatus, including integral sampling systems of aspirated apparatus, intended to be used for commercial and industrial safety applications. It does not apply to external sampling systems, or to apparatus of laboratory or s