When it comes to early fire detection, WAGNER relies on optical air sampling smoke detectors with HPLS (High Power Light Source) technology.
Air sampling smoke detection system structure is based on a pipe system with air sampling points and a base unit with a detector module. For project configuration purposes, each of the air sampling points correspond to one point-type smoke detector. Air sampling smoke detectors use vacuum pressure to take continuous samples of the ambient air, and guide these samples to a sensitive optical detector that examines them for the smallest traces of smoke particles.
Detection chamber sensitivity is expressed in terms of light obscuration per meter; WAGNER’s air sampling smoke detectors have high to very high sensitivity levels (EN 5420 Classes A, B and C). They react with up to 2,000 times more sensitivity than conventional point-type detectors.
A fan inside the base unit generates the vacuum pressure needed to sample the air. Integrated air flow sensors continually monitor the pipeline system for potential blockages or breaks in order to ensure that the air sampling process functions correctly.
Air sampling smoke detection systems can be configured perfectly to individual situational needs, and compared to point-type systems, they detect fires much earlier and with much greater security against false alarms. Increased security against false alarms in modern air sampling smoke detectors thanks to LOGIC.SENS: If the air contains aerosols, the system compares the signal paths they create against previously learned fire patterns. If the signal path matches a fire pattern, an alarm is triggered.
Filters installed between the pipe system and the detector module prevent any dust which has been sucked in from getting into the detector module and being registered as smoke there.
WAGNER’s patented LOGIC∙SENS signal processing compares the signal curves of air samples taken with established smoke development patterns, thus dependably precluding false alarm scenarios, even in difficult application areas. LOGIC·SENS thus effectively fulfils VDE 0833-2 standards for preventing false alarms in TM operating mode.
Drift compensation ensures that the alarm threshold adjusts itself to the change in quiescent level (within the scope of normative specified limits) which is triggered by contaminated air or other background noise. Adjusting to background contamination in this way means that the same amount of smoke is always required to trigger an alarm, thereby ensuring uniform detection quality. It can thus be considered absolute fire detection. By comparison, air sampling smoke detectors without drift compensation have relative fire detection, since they incorrectly interpret changing background concentrations as smoke density.