- Author
-
Cleary, T. G.
|
Chernovsky, A.
|
Grosshandler, W. L.
|
Anderson, M.
- Title
- Particulate Entry Lag in Smoke Detectors.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
-
NISTIR 6242
October 1998
- Distribution
- Available from National Technical Information Service
- Book or Conf
- National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. November 2-5, 1998,
Gaithersburg, MD,
Beall, K. A., Editors,
11-12 p.,
1998
- Keywords
-
fire research
|
fire science
|
fire suppression
|
smoke detectors
|
time lag
|
sensors
|
signals
- Abstract
- It is well known that smoke detectors do not instantaneously respond to smoke concentration directly outside the detector. The smoke must be transported through the detector housing to a sensing location inside the detector. The sensing time lag is a function of the free stream velocity of the smoke laden air as it approaches the detector. Previous work correlated the detector time lag as a first-order response with a characteristic time defined as L/V, where L is a characteristic length and V is the characteristic velocity (ceiling jet velocity of free stream velocity).