COMBINED SCATTERED LIGHT- AND EXTINCTION-BASED FIRE DETECTOR

摘要

The invention relates to a method and a fire detector comprising at least two sensor units, said detector monitoring a confined space to detect a fire. According to the invention, a first fire parameter is monitored according to the scattered light method, using a first sensor unit located in the vicinity of the ceiling. At least one second sensor unit of the fire detector, which emits at least two highly focussed light beams towards the floor of the confined space, monitors a second fire parameter according to the extinction method.