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A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. Fire alarms are usually set in fire alarm systems to provide zonal coverage for residences and commercial buildings. A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. Fire alarms are found in Homes, Offices, Factories, and public buildings, they are a part of our everyday routine. Shopbwana lists Fire Alarms here.
There are two types of smoke alarms in general use for home smoke alarms: photoelectric and ionization. These smoke alarms sense the presence of smoke differently. The type of smoke produced by a fire depends on the type of fire. Flaming fires produce a different type of smoke than smouldering fires.
A dual sensor alarm provides the best protection and for that reason it is recommended. There are alarms available that are multicriteria or intelligent alarms, what this means is they use many different sensors such as photoelectric, ionization, and heat along with an algorithm to detect a fire.
A fire alarm is triggered by the smoke detector to alert residents to a potential fire. The smoke detector will sense the smoke, and may or may not make noise when it does.
The main types of detectors:
The International Association of Fire Chiefs recommends a carbon monoxide detector on every floor of your home, including the basement. A detector should be located within 10 feet of each bedroom door and there should be one near or over any attached garage.
Hardwired smoke detectors are better than their battery-powered counterparts in every major aspect—safety, efficiency, maintenance and compliance with local codes