scope:

NEN-EN 54-12 specifies requirements, test methods and performance criteria for line detectors using an optical beam that detect smoke by utilizing the attenuation and/or changes in attenuation of an optical beam, for use in fire detection and fire alarm systems installed in buildings (see EN 54-1:2011). This European Standard provides for the assessment and verification of constancy of performance (AVCP) of line detectors using an optical beam to this EN. This European Standard does not cover: - Line detectors using an optical beam designed to operate with separations between opposed components of less than 1 m; - Line detectors using an optical beam whose optical path length is defined or adjusted by an integral mechanical connection; - Line detectors using an optical beam with special characteristics, which cannot be assessed by the test methods in this European Standard.