Fire detection and fire alarm systems - Part 12: Smoke detectors - Line detectors using an optical beam

This specification addresses the performance requirements, testing methodologies, and classification criteria specifically designed for line-type beam smoke detectors within fire detection and fire alarm systems. It defines technical parameters for optical devices used to monitor large open spaces, where a beam of light traverses a monitored area to detect the presence of smoke particles. The document outlines procedures for verifying sensitivity, response time, and susceptibility to environmental interferences such as dust, humidity, or ambient light fluctuations. It establishes clear acceptance criteria for the installation, commissioning, and maintenance of such systems to ensure reliable operation during emergency scenarios. Compliance with these provisions ensures that the detected beams maintain the required attenuation levels to trigger alarms appropriately when smoke density exceeds defined thresholds. The text serves as a reference for manufacturers, installers, and authorities involved in the deployment of safety infrastructure, providing a unified framework for evaluating system integrity and operational consistency across different environments.