is a device that uses a beam of projected light to detect smoke over large areas,[1] usually as an indication of a fire. [2] They are used to detect fires in buildings where point smoke detectors are either uneconomical [3] or restricted to use depending on the height of the building.
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are optical fire detection devices, which are able to detect infra-red and/or ultra violet radiation given off from a flaming fire.
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is an electronic fire-protection device that automatically senses the presence of smoke, as a key indication of fire, and sounds a warning to building occupants.
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is a device that detects the presence of gases in an area, often as part of a safety system. A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave.
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is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the element regulate the rate flow of heat into the element. All heat detectors have this thermal lag.
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detector or CO detector is a device that detects the presence of the carbon monoxide (CO) gas to prevent carbon monoxide poisoning.
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(combined optical and heat detectors) They are detectors that mix heat detectors with smoke detectors inside one sensor In vital places where it can happen smoke and heat
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devices used to detect the presence of smoke in the airstream of ductwork sections of the HVAC air handling systems typically used in commercial buildings
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