- Author
- Pitts, W. M. | Mulholland, G. W. | Breuel, B. D. | Johnsson, E. L. | Chung, S. | Harris, R. H., Jr. | Hess, D. E.
- Title
- Real-Time Suppressant Concentration Measurement.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
- NIST SP 890; Volume 2; Section 11, November 1995,
- Book or Conf
- Fire Suppression System Performance of Alternative Agents in Aircraft Engine and Dry Bay Laboratory Simulations. Volume 2, Gann, R. G., Editors, 319-590 p., 1995
- Keywords
- fire suppression | aircraft engines | nacelle fires | simulation | halon 1301 | halon alternatives | aspirated hot films | cold wires | concentration fluctuations | concentration measurement | infrared detectors | infrared absorption | temperature measurements
- Identifiers
- dry bay; development and testing of a combined aspirated hog-film and cold-wire probe; evaluation of infrared sensing for rapid measurement of halon replacement chemicals; review of statham and halonyzer extinguishing-agent concentration recorders; literature search for additional diagnostics for high-speed alternative-agent concentration measurement
- Abstract
- The development and testing of two approaches for recording real-time measurements (millisecond time resolution) of concentration for halon alternatives are summarized. Discussions of the background necessary to understand their operation is included. The first instrument is a combined aspirated hot-film/cold-wire probe which is calibrated to record both temperature and concentration. The second is a specially developed instrument based on infrared absorption near 8.5 µm which has been dubbed the Differential InfraRed Rapid Agent Concentration Sensor (DIRRACS). A series of tests of the instruments in the full-scale dry-bay test facility at Wright-Patterson AFB is summarized. The characteristics of the current devices used to measure halon 1301 concentrations - the Statham analyzer and Halonyzer - are reviewed. The final section contains a literature review assessing other potential techniques for making the required concentration measurements.