Scope

This European Standard specifies minimum requirements and tests for electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen using software and/or digitaltechnologies.This European Standard is applicable to fixed, transportable and portable apparatus intended for usein domestic premises as well as commercial and industrial applications and their software-controlledsafety related accessories.This European Standard does not apply to external sampling systems which are not accessories, or toapparatus of laboratory or scientific type, or to apparatus used only for process control purposes.This European Standard supplements the requirements of the European Standards for the detectionand measurement of flammable gases and vapours (e.g. EN 60079-29-1, EN 60079-29-4, EN 50194-1, EN 50194-2), toxic gases (e.g. EN 45544 series, EN 50291-1, EN 50291-2) or oxygen (e.g.EN 50104).NOTE 1 These European Standards will be mentioned in this European Standard as “metrological standards”.NOTE 2 The examples above show the state of the standardization for gas detection apparatus at the time ofpublishing this European Standard. There may be other metrological standards for which this European Standardis also applicable.This European Standard is a product standard which is based on the EN 61508 series. It covers partof the phase 10 “realisation” of the overall safety life cycle defined in EN 61508-1.Additional requirements are specified if compliance with safety integrity level 1 (SIL 1) according to theEN 61508 series is claimed for fixed or transportable apparatus for low demand mode of operation.They can also be applied to portable apparatus which are able to perform an automatic executiveaction.It is recommended to apply this European Standard for apparatus used for safety applications withSIL-requirement 1 instead of EN 50402. However, the technical requirements of EN 50271 andEN 50402 are the same for SIL 1.NOTE 3 For apparatus used for safety applications with SIL-requirements higher than 1 EN 50402 is applicable.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	EXL/31/1