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Fire detector

Fire detectors are used in a variety of industries for detecting certain fire conditions, such as unwanted or potentially dangerous fires or flames. Generally, a fire detector is composed of a base and a body thereof. The base of the detector is fixed to the ceiling of a room with screws or the like. The body of the detector is detachably mounted to this base with metal fitting parts. Fire detectors typically include one or more sensors each of which receives radiation in a given wavelength or spectral band and generates an analog signal dependent upon the amount of radiation in the spectral band, an analog-to-digital converter (ADC) which converts each analog signal to a digital signal and circuitry which uses the digital signals to detect a presence of a fire condition. There are many types of fire detectors in current use. The flame sensing detector is designed to respond to the optical radiant energy generated by the diffusion flame combustion process. Two types of flame detectors are commonly in use: the ultraviolet detectors which operate beyond the visible wavelengths below 4,000 A, and the infrared detectors which operate in the wavelengths above 7,000 A. Thermal fire detectors are designed to operate from thermal energy output. This heat is dissipated throughout the area by laminar and turbulent convection flow. here are two basic types of thermal fire detectors: the fixed temperature type and the rate-of-rise detector type. The fixed temperature fire detector further divides into the spot type and the line type. A photoelectric type of smoke detector has a housing composed of a detector body and a cover fitting on the body. A printed circuit board is provided on the bottom of the body. An optic base is disposed in an opening formed in the upper side of the housing. In photoelectric fire detectors for detecting smoke that stems from a fire, a light emission section is driven to glow at regular intervals. Light emitted from the light emission section and then scattered or attenuated due to smoke stemming from a fire is received by a light reception section, converted into an electrical signal, and sampled as a smoke detection signal proportional to the concentration of the smoke.

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Fire detector product listings

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