{"id":40842,"date":"2018-04-27T11:34:10","date_gmt":"2018-04-27T10:34:10","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=40842"},"modified":"2018-04-29T18:13:35","modified_gmt":"2018-04-29T17:13:35","slug":"reduction-of-false-alarms-when-multi-sensor-detectors-used","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/health-safety-news\/reduction-of-false-alarms-when-multi-sensor-detectors-used\/40842\/","title":{"rendered":"Research tests show reduction of false alarms when multi-sensor detectors are used"},"content":{"rendered":"

A study conducted by the Building Research Establishment (BRE) in partnership with the Fire Industry Association (FIA) and key fire detection and alarm manufacturers has concluded that multi-sensor detectors are better at rejecting false alarms<\/h2>\n

The research was a continuation of prior research from three previous projects, which looked at the occurrence of false alarms in the UK.\u00a0 Over the past 10 years, the FIA<\/a> and BRE<\/a> have partnered with King\u2019s College<\/a>, Buckinghamshire Milton Keynes Fire Brigade<\/a>, and Scotland Fire Brigade<\/a> to investigate and find solutions to the false alarm problem that perpetuates across the UK.<\/p>\n

Those previous projects provided anecdotal indication that employing multi-sensor fire detectors would help reduce the occurrence of false alarms<\/a>.\u00a0 However, hard evidence was missing to establish how effective multi-sensors could be in reducing false alarms.<\/p>\n

Categories of multi-sensor detectors<\/h3>\n

12 manufacturers from the UK and Europe were involved in the research. These represented most of the detectors sold in the UK.\u00a0 From those 12 manufacturers we put together 35 different detectors and those were tested against two standard optical smoke detectors<\/a>, one commercial, and one domestic.<\/p>\n

There are many different sorts of multi-sensors.\u00a0 The research focused on multi-sensor detectors which comprised of an optical smoke chamber together with a heat sensor.\u00a0 However, even within this detector type, performance varies greatly dependent upon the design and the settings used. As a result, the research graded them into three categories: \u2018standard, intermediate and advanced performance\u2019.<\/p>\n

\u2018Standard\u2019 multi-sensor detectors were those smoke\/heat detectors which used the heat element to modify the response of the smoke sensor, meaning that the detector would respond more rapidly when heat is present. With no heat present the detector may then also delay its response.<\/p>\n

The \u2018intermediate\u2019 category were the detectors that used a smoke chamber design that incorporated features of the \u2018standard\u2019 detectors, but with added design benefits, for example a more specifically designed chamber to eliminate potential for false alarms, such as an insect going into the chamber, or the effect of dust which may cause a false alarm.<\/p>\n

The \u2018advanced\u2019 category, which the research predicted was the most likely to be the most effective at reducing false alarms, were those which had the features of the \u2018standard\u2019 and \u2018intermediate\u2019 categories, but also employed sophisticated targeted algorithms which would eliminate a false alarm.<\/p>\n

\"multi-sensorComparing sensitivity<\/h3>\n

Following categorisation, the next stage of the research was to test the sensitivity of the different multi-sensor detectors compared to standard optical smoke detectors.<\/p>\n

10 different fire tests were conducted, looking specifically at the performance of the detector and their ability to detect fires. The fire tests included the standard fire tests \u2013 TF2,3,4, and 5 \u2013 which are in EN54-7 the European standard for smoke detectors<\/a>.\u00a0 TF1 and TF8 were then added, which are additional fire tests that have been included in EN 54-29, a new European standard for fire detectors combining smoke and heat sensors.\u00a0 TF1 is specifically a hot wood-burning fire that produces heat yet not much smoke, and TF8 is a fuel-burning fire that produces very little heat, but very heavy smoke. In this way, the testing represented the extreme ends of the spectrum for fires that may occur in real life.<\/p>\n

A good fire detector needs to be used in almost every circumstance and must be able to detect a whole range of fire types that may be encountered depending on the fire risk.<\/p>\n

To the 6 test fires listed above, 4 new fires were specifically designed for the research (these were not listed in EN54), to extend the range of test fire types.\u00a0 These were based on fire retardant material or MDF material, creating slow-burning fires, again replicating real-life situations.<\/p>\n

All the detectors \u2013 both multi-sensors and optical smoke detectors were tested against all of the different test fires.\u00a0 You might expect that in terms of sensitivity and ability to detect fires that the multi-sensor detectors would perform better.<\/p>\n

However, the research results were not so clear and it was difficult to differentiate very easily between the performance of the multi-sensors as a group and the performance of the standard optical smoke detectors. Essentially, detector performance depended very much on their sensitivity \u2013 the high sensitivity detectors detecting quicker and faster than the low sensitivity detectors.\u00a0 This held true for both multi-sensor detectors and standard optical smoke detectors.\u00a0 There was no real way of differentiating performance between the \u2018old-style\u2019 optical smoke detectors and the \u2018new-type\u2019 multi-sensor detectors.<\/p>\n

Testing for false alarm rejection<\/h3>\n

In knowing that there was not much difference in ability to detect fires, the second test was then to test all the detectors in their ability to reject typical false alarm situations. Would the multi-sensor detectors perform better?<\/p>\n

The false alarm testing was developed in conjunction with the University of Duisburg<\/a> in Germany; the team there had some expertise in developing false alarm testing.\u00a0 In addition, bringing in a university meant that there was a further element of impartiality and independence from the industry as well.<\/p>\n

Five different false alarm tests were carried out in total: burning toast, cooking, steam, dust, and aerosol spray.\u00a0 Other tests such as cigarette smoke and long-term dust were also considered, but these were abandoned because repeatable results were not possible due to the amounts of variability in these two tests.<\/p>\n

What were the results?<\/h3>\n

There were two outcomes from the tests \u2013 the first being the results of the tests themselves, and the second outcome was that the initial grading of the multi-sensor detectors into \u2018standard\u2019, \u2018intermediate\u2019, and \u2018advanced\u2019 categories was correct.<\/p>\n

During the false alarm tests all the multi-sensor detectors responded later than the optical smoke detectors \u2013 either the domestic or the commercial smoke alarms. For example, on the toast burning test, some of the multi-sensor detectors (those in the \u2018advanced\u2019 category) responded a good minute after the optical smoke detectors. By responding later, this demonstrates that multi-sensor detectors are not as prone to alarm as optical smoke detectors for events such as burning toast or steam, providing better overall resistance to false alarms.<\/p>\n

Additionally, the fire tests justified the way the research categorized the different types of detectors \u2013 in that they all responded in the right order, i.e. the \u2018standard\u2019 category responded first (meaning they were not as good at rejecting false alarms), then the \u2018intermediate\u2019 category alarmed afterwards, and finally the \u2018advanced\u2019 category of detectors (which had the benefit of sophisticated algorithms to filter out false alarms), responded latest.<\/p>\n

The conclusion? The more sophisticated the multi-sensor detector, the less likely they are to false alarm. And additionally, multi-sensor detectors are better at rejecting false alarms than optical smoke detectors of any category.<\/p>\n

\"multi-sensorThe future<\/h3>\n

With the conclusion that multi-sensor detectors are more effective at false alarm rejection, and that effectiveness increasing depending on the categorisation of the specific detector, there is scope in the future for the FIA to be involved with developing a means of grading detectors within the British and European Standards.<\/p>\n

The FIA, in conjunction with other industry bodies and stakeholders, are also considering the introduction of new false alarm tests, that were developed for the research, within the European or British Standards.\u00a0 This means that detectors will come with a label identifying the level of resilience to specific types of false alarm.<\/p>\n

Both of the above will help categorise detectors according to their ability to reject false alarms, ultimately meaning that users will be able to understand what they are buying, and for installation and maintenance companies to be able to recommend a category of detector to their clients to solve a false alarm issue within a building.\u00a0 This will be especially helpful where there are buildings that are particularly prone to false alarms \u2013 helping to minimise disruption to businesses and reduce strain on Fire and Rescue Service callouts.<\/p>\n

Ultimately, this will have an impact on manufacturers and how they are going to create their products for the future.\u00a0 Designs may be re-evaluated for their level of effectiveness against false alarms \u2013 but of course, further research and development of products is more expensive.\u00a0 However, the benefits of developing these products may mean that we start to see even more sophisticated multi-sensor detectors on the market in the future.<\/p>\n

To find out more about the FIA\u2019s sponsorship and involvement with research, visit www.fia.uk.com<\/a>.<\/p>\n

Bernard Laluvein<\/strong>
\nDirector of ADT Fire & Security
\nChairman of the FIA\u2019s Fire Detection and Alarm Council
\nRobert Yates<\/strong>
\nFIA Technical Manager
\nSecretary to the FIA\u2019s Fire Detection and Alarm Council
\nwww.fia.uk.com<\/a>
\nTwitter: @FireIndustry<\/a><\/p>\n

\n<\/div>","protected":false},"excerpt":{"rendered":"

A study conducted by the Building Research Establishment (BRE) in partnership with the Fire Industry Association (FIA) and key fire detection and alarm manufacturers has concluded that multi-sensor detectors are better at rejecting false 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