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Time Resolved Size Distributions of Test Smoke and Nuisance Aerosols.


pdf icon Time Resolved Size Distributions of Test Smoke and Nuisance Aerosols. (491 K)
Cleary, T. G.

International Conference on Automatic Fire Detection "AUBE '04", 13th Proceedings. University of Duisburg. [Internationale Konferenz uber Automatischen Brandentdeckung.] September 14-16, 2004, Duisburg, Germany, Luck, H.; Laws, P.; Willms, I., Editor(s)(s), 500-509 pp, 2004.

Keywords:

fire detection; fire detection systems; aerosols; size distribution; smoke; soot; smoke detectors; cigarettes

Abstract:

An electrical low-pressure impactor (ELPI) has been used to measure the size distribution of various test smokes and nuisance aerosols generated in the fire emulator/detector evaluator (FE/DE). Previously reported size results were timeaveraged values with sampling times on the order of five minutes required to collect a weighable amount. The ELPI is a 12-stage cascade impactor that separates particles between an aerodynamic diameter size range of 0.03 mm to 10 mm, which covers a wide range of particle sizes of interest in smoke alarm research. A complete size distribution is recorded every 10 s. The size distributions of several test smokes including: propene soot, smoldering cotton, and smoldering wood smoke were measured throughout smoke alarm exposure tests. The size distribution of several nuisance aerosols including: dust, cigarette smoke, and cooking smokes were also measured. Additionally, comparisons were made between the ELPI results and results from a tapered element oscillating microbalance and the measuring ionization chamber.