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SAFETY & SECURITY Multi-sensor safety


Andy Speake of Aico discusses how multi-sensor alarm technology is reducing costs as well as increasing safety from false alarms in social housing


ico introduced the first mains powered domestic multi-sensor to the smoke alarm market in 2014 as a means of reducing false alarms and providing the best response to all fire types, making alarm specification and installation simpler in the process. Since then, ranges of multi-sensors have entered the domestic market and have been growing rapidly in popularity, notably in the social housing sector.


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The typical multi-sensor uses both optical and heat sensors within the same alarm unit, although other variations exist. Multi-sensors vary dramatically in


design, from basic models where there is limited cross evaluation of the sensor values, through to highly sophisticated devices that can assess the variation in values from each sensor in order to determine the nature of the potential fire. Consequently, their ability to detect fires while discerning false alarm sources is a very mixed bag indeed. However, the more sophisticated devices are extremely effective at providing a quick response to both slow smouldering and fast flaming fires, while remaining more impervious to kitchen fumes and contamination, which are so often the cause of false alarms.


The Building Research Establishment (BRE) 2018 Briefing Paper – ‘The performance of multi-sensors in fire and false alarm tests’ – reports on the findings of its testing of 35 different optical heat multi-sensors. It estimates that potentially 38.1 per cent of observed false alarms could have been reduced if multi-sensors had been present.


Cost implications


Multi-sensors are more sophisticated than single sensor alarms and are priced accordingly; however you are getting two alarm types in one and, with the more sophisticated models such as our own, there are complex algorithms


ADF OCTOBER 2019 WWW.ARCHITECTSDATAFILE.CO.UK


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