- Author
-
Pistor, M.
- Title
- On a Scattered-Light Measuring Device for the Use in Testing Types of Smoke Detectors. Final Report.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Report
-
NBSIR 76-1087,
July 1976,
35 p.
- Distribution
- Available from National Technical Information Service
- Book or Conf
- AACHEN. International Conference on Automatic Fire Detection, 7th. Probleme der Automatischen Brandentdeckung. March 5-6, 1975,
213-241 p.,
['1975', '1976']
- Keywords
-
fire detection
|
light extinction
|
light scattering
|
smoke detectors
- Abstract
- Generally, the response threshold value of fire detectors is tested with measuring instruments which operate on the same physical principle as the detectors to be tested. For example, this means that the response threshold value of an ionization measuring chamber and the response threshold value of an optical-type smoke detector operating on a light extinction principle is checked using an extinction measuring instrument. However, optical-type smoke detectors operating on a light-scatter principle (photoelectric in U.S. parlance) have also been checked using an extinction measuring measuring instrument. Since the light-scatter type of smoke detector is by far the most commonly used of the optical type of smoke detector it seems appropriate to use a light-scatter measuring instrument to check the response threshold value of these detectors. In addition, the need for such a measuring instrument is emphasized by the fact that both the parameters of the smoke aerosol and the design features of the measuring instrument are affected in different ways by light scatter and light extinction. The author describes the technical features and design details of along with some experiments to determine its response to these detectors.