BS EN 401:1993 Respiratory protective devices for self-rescue. Self-contained closed-circuit breathing apparatus. Chemical oxygen (KO2) escape apparatus. Requirements, testing, marking
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This European Standard refers to self-contained closed-circuit breathing apparatus, chemical oxygen (KO2) type, for escape (in short: chemical oxygen (KO2) escape apparatus). This standard does not apply to devices for work and rescue or to diving devices. It specifies minimum requirements for chemical oxygen (KO2) escape apparatus. Laboratory and practical performance tests are included for the assessment of compliance with the requirements.
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 132, Respiratory protective devices; Definitions. EN 134, Respiratory protective devices; Nomenclature of components. EN 136, Respiratory protective devices; Full face masks; Requirements, testing, marking.
For the purposes of this European Standard the definitions given in EN 132 and the nomenclature given in EN 134 apply, together with the following.
A chemical oxygen (KO2) escape apparatus is designed and constructed so that breathing gas is exhaled via the facepiece into the circuit which contains a cartridge with chemical(s) which absorbs both exhaled carbon dioxide and humidity and releases oxygen and also into a breathing bag where it is available for rebreathing. The gas flow may be of the pendulum or loop type and excess gas is ejected via a relief valve.
