Flame detector
Flame detectors monitor combustion processes for the presence or absence of flame within each part of the process or within the system as a whole. Fire detection systems are widely used today in many environments in which the systems detect a fire rapidly, discriminate it from false alarms conclusively, trigger an alarm automatically and release suppressant reliably to control it quickly, so that no lives are lost and no properties are damaged. Flame detectors may comprise an optical sensor for detecting electromagnetic radiation, for example, visible, infrared or ultraviolet, which is indicative of the presence of a flame. The advantage of detecting ultra violet emissions is that it provides a direct measure of brightness in a flame and in a prescribed range of wavelengths gives excellent discrimination. Ultraviolet flame detectors are well suited to the task of monitoring oil or gas flames, which burn brightly and generate a significant signal in the prescribed wavelengths. An infra-red detector has the advantage that it is not as strongly susceptible to attenuation by oil mist and combustion products, or water vapour. It is also more tolerant of movement than is the UV spectral base. Thus, infra red flame detectors are typically used to monitor pulverised coal (pc) flames, which do not burn brightly within a well defined envelope but tend to coalesce in a random fashion resulting in movement, and which also generate water vapor.
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