Record Display for the EPA National Library Catalog


Main Title Design and Development of a MicroThermocouple Sensor for Determining Temperature and Relative Humidity Patterns within an Airstream.
Author Eisner, A. D. ; Martonen, T. B. ;
CORP Author Northrop Services, Inc., Research Triangle Park, NC.;Health Effects Research Lab., Research Triangle Park, NC.
Publisher c1989
Year Published 1989
Report Number EPA-68-02-4450; EPA/600/J-89/363;
Stock Number PB90-215963
Additional Subjects Thermocouples ; Humidity ; Atmospheric temperature ; Airstreams ; Psychrometers ; Formulas(Mathematics) ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB90-215963 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
The paper describes the production and calibration of a miniature psychrometer treated with a specially developed porous coating. The investigation was conducted to determine localized patterns of rapidly changing temperature and relative humidity in dynamic flowing gas environments (e.g., with particular attention to future applications to the human respiratory system). The technique involved the use of dry miniature thermocouples, and wetted miniature thermocouples coated with boron nitride, to act as a wicking material. A precision humidity generator was developed for calibrating the psychrometer. It was found that, in most cases, the measured and expected (theoretically predicted) relative humidity agreed to within 0.5% to 1.0% relative humidity. Procedures that would decrease this discrepancy even further were pinpointed, and advantages of using the miniature psychrometer were assessed.