>>190756844fire detectors=//=fire supressor system
for it to combat flame you need water sprinkles also and a controll module hooked to a waterfeed\powerfeed. Then it will work as intended - detectors detect smoke\fire, then they break chain what hold electrical switch for water, water then pour out from water sprinklers. Thus fire is suppressed. When everything is fine you disable it wia controll module by closing up waterfeed.
As i see there its a simple system what send a signal to firefighting department and, maybe, to people inside (if they installed so-called "screamer" what will start to wail when triggered).
Those smoke-detectors (cause fire detectors cost much more) do have a big error margin ("nice" thing standing under ceiling while holding this shit, screwdriver and a testing device while having only 2 hands and Thanks whoever invented instrumental belts). You need to check them every 3-6 month while they are in service or they can go bad. If they do go bad then they will not work as intended - they will not send a signal out, thus leaving less time for people to evacuate and slower firefighters arriving which will lead to people deaths.