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Temperature Uncertainties for Bare-Bead and Aspirated Thermocouple Measurements in Fire Environments.


pdf icon Temperature Uncertainties for Bare-Bead and Aspirated Thermocouple Measurements in Fire Environments. (439 K)
Pitts, W. M.; Braun, E.; Peacock, R. D.; Mitler, H. E.; Johnsson, E. L.; Reneke, P. A.; Blevins, L. G.

NISTIR 6242; October 1998.

Combustion Institute, 1st Joint Meeting of the U.S. Sections: Western States, Central States, Eastern States. Proceedings. 709-712 pp, March 14-17, 1999 AND National Institute of Standards and Technology. Annual Conference on Fire Research: Book of Abstracts. November 2-5, 1998, Gaithersburg, MD, Beall, K. A., Editor, 15-16 pp, 1998, 1999.

Available from:

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Order number: PB99-102519

Keywords:

fire research; fire science; fire suppression; aspirated thermocouples; enclosures; fire tests; measurement uncertainties; temperature measurements; thermocouples

Abstract:

Gas-phase temperature is the most ubiquitous measurement recorded in fire environments and plays a central role in understanding of fire behavior. Generally, either bare-bead or sheathed thermcouples are employed. While it is recognized that such thermcouples are subject to significant systematic errors when used in fire environments, e.g., see, in most fire studies uncertainties for temperature measurements are not estimated or reported. The work summarized here has been undertaken to characterize the uncertainties in temperature measurements which can occur when bare-bead thermocouples are used in fire environments and to assess the potential of two approaches -- aspirated thermocouples and the use of multiple thermocouples having different diameters -- to reduce the uncertainties.