Time Resolved Size Distributions of Test Smoke and Nuisance Aerosols.
Time Resolved Size Distributions of Test Smoke and
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.
fire detection; fire detection systems; aerosols; size
distribution; smoke; soot; smoke detectors; cigarettes
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.