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Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen. Requirements on the functional safety of gas detection systems Ingestion-build-44616 This part of IEC 614961 Scope This European Standard is applicable to detection and measurement apparatus and systems for flammable or toxic gases or vapours or oxygen. It covers apparatus intended to measure reliably, gas concentration and to provide an output signal (alarm and or measurement signal), the purpose of which is to give a warning of a potential hazard. This European Standard is a product standard which is based on EN 61508 (all parts) and for gas detection