Description

The 12 part of the BS EN 54 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 BS EN 54-1:2011). 

This Part provides for the assessment and verification of constancy of performance (AVCP) of line detectors using an optical beam to this EN.

Scope

BS EN 54-12 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 BS EN 54-12