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Laboratory evaluation of smoke detectors for use in underground mines.
Fire Saf J 2009 Apr; 44(3):387-393
Laboratory experiments were conducted to determine the responses of a prototype smoke detector and a commercially available photoelectric smoke detector to smoke particles generated from various combustion sources. The prototype smoke detector combines optical scattering measurements with ionization chamber measurements in order to reduce/eliminate nuisance alarms due to the presence of airborne dusts or diesel exhaust particles. The commercially available smoke detector is designed for use in harsh environments where airborne dust represents a major problem due to both nuisance alarms and detector contamination. In the experiments, the responses of the two detectors were measured when exposed to smoke particles from the exhaust of a diesel engine and from a variety of fire sources, including wood, coal, styrene butadiene rubber, and No. 2 diesel fuel. For the solid fuels, data were obtained for both smoldering and flaming combustions. This report describes the experiments, their results, and the use of these results as they apply to early-warning fire sensors capable of the rapid and reliable detection of fires in atmospheres that may or may not be contaminated by either airborne dust or the products produced from diesel engines.
Monitoring-systems; Monitors; Mining-industry; Fire-safety; Underground-mining; Author Keywords: Fire; Smoke; Detection; Sensors
Charles D. Litton, National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory/Disaster Prevention and Response Branch, Box 626, Cochrans Mill Road, Pittsburgh, PA 15236, USA
Issue of Publication
Fire Safety Journal