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Flame detector - belling electric cookers - electric pressure cookers Manufacturer by wqegtf desvf
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Flame detector - belling electric cookers - electric pressure cookers Manufacturer by WQEGTF DESVF
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| Article Posted: 03/17/2011 |
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Flame detector - belling electric cookers - electric pressure cookers Manufacturer |
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Types Ultraviolet Ultraviolet (UV) detectors work with wavelengths shorter than 300 nm. These detectors detect fires and explosions within 34 milliseconds due to the UV radiation emitted at the instant of their ignition. False alarms can be triggered by UV sources such as lightning, arc welding, radiation, and sunlight. In order to reduce false alarm a time delay of 2-3 seconds is often included in the UV Flame detector design. Infrared Infrared (IR) flame detectors work within the infrared spectral band. Hot gases emit a specific spectral pattern in the infrared region, which can be sensed with a thermal imaging camera (TIC) a type of thermographic camera. False alarms can be caused by other hot surfaces in the area. A typical frequency where single frequency IR flame detector is sensitive is in the 4.4 micrometre range. Typical response time is 3-5 seconds. UV/IR UV and IR flame detectors compare the threshold signal in two ranges in "AND" configuration and their ratio to each other to confirm the fire signal and minimize false alarms. IR/IR flame detection Dual IR (IR/IR) flame detectors compare the threshold signal in two infrared ranges. In this case one sensor looks at the 4.4 micrometre range and the other sensor at a reference frequency. IR/IR/IR flame detection Triple IR flame detectors compare three specific wavelength bands within the IR spectral region and their ratio to each other to reliably detect flames and minimize false alarms. In this case one sensor looks at the 4.4 micrometre range and the other sensors at a reference frequencies. Visible sensors In some detectors a sensor for visible radiation is added to the design in order to be able to discriminate against false alarms better or improve the detection range. Example: UV/IR/vis, IR/IR/vis, IR/IR/IR/vis flame detectors. Video Closed-circuit television or a web camera can be used for video detection (wavelength between 0.4 and 0.7 m). Like humans, the camera can be blinded by smoke or fog. Applications UV/IR flame detectors are used on hydrogen stations. See also Flame detection Active fire protection Flame ionization detector Gas leak detection Fire alarm system References ^ Treyin, B. Ugur; Dedeoglu, Yigithan; Cetin, A. Enis (2005). "Flame detection in video using hidden Markov models". IEEE International Conference on Image Processing, 2005 (Piscataway, N.J.: Institute of Electrical and Electronics Engineers) 2: 12303. doi:10.1109/ICIP.2005.1530284. ISBN 0-7803-9134-9. http://www.cs.bilkent.edu.tr/~ismaila/MUSCLE/HMMIcip05.pdf. ^ Karner, Don; Francfort, James (December 2003). Arizona Public Servicelternative Fuel (Hydrogen) Pilot Plant Design Report. U.S. Department of Energy FreedomCAR & Vehicle Technologies Program. pp. Appendix F (pdf).. Categories: Fire detection and alarm Detectors I am an expert from electricmulticooker.com, while we provides the quality product, such as belling electric cookers , electric pressure cookers Manufacturer, electrical cooker,and more.
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