With crafted-in Degraded Manner operation, the method is able to common alarm if a fire alarm ailment is current even though the central processing unit (CPU) fails Particle counting: Immediately after drawing in air, the technique employs a laser beam and Photograph collector to measure mirrored light-weight with the particles. https://www.firesense.co.uk/type/addressable-fire-system/addressable-beam-detectors/