Smoke Detector

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A heat detector 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. Heat detectors have two main classifications of operation, "rate-of-rise" and "fixed temperature". The heat detector is used to help in the reduction of property damage

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Optical smoke detectors are one of two primary types of smoke detection alarm, along with ionizing smoke detectors.The optical detector uses a unique measuring system. Unlike most other optical scatter detectors the optical design does not use vertical chevrons to exclude ambient light, but uses concentric baffles. This approach gives a better signal to noise ratio. This type of detector is very effective in detecting very low levels of visible smoke particulates (often at levels where they are not visible to the naked eye). Invisible smoke aerosol products, cannot however, be detected using current optical smoke detectors as these aerosols do not scatter or obscure light. This means that optical detectors favor the type of fire that we have described as slow burning.

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A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization). Detectors may use one or both sensing methods. Sensitive alarms can be used to detect and deter smoking in banned areas. Smoke detectors in large commercial and industrial buildings are usually connected to a central fire alarm system.