- Author
- Zarr, R. R. | Flynn, D. R. | Hettenhouser, J. W. | Brandenburg, N. J. | Healy, W. M.
- Title
- Fabrication of a Guarded-Hot-Plate Apparatus for Use Over an Extended Temperature Range and in a Controlled Gas Atmosphere.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD MetSys Corp., Millwood, VA
- Sponsor
- North American Insulation Manufacturers Association DOE Office of Industrial Technology
- Book or Conf
- International Thermal Conductivity 28th Conference/International Thermal Expansion 16th Symposium. Proceedings. June 26-29, 2005, DEStech Publications, Inc., New Brunswick, Canada, Dinwiddie, R.; White, M. A.; McElroy, D. L., Editors, 235-245 p., 2005
- Keywords
- guarded-hot-plate apparatus | insulation | temperature range | gas atmosphere | transmission | equipment | thermometers | thermocouples | thermopile | calibrating | vaccum chambers
- Identifiers
- Standard Platinum Resistance Thermometers (SPRTs); metal-sheathed heaters, thermocouples, thermopiles; cold plate assembly; dge guard assembly
- Abstract
- This paper describes a guarded-hot-plate apparatus suitable for determining the steady-state thermal transmission properties of insulation specimens from 90 K to 900 K in a controlled gas atmosphere from 10-5 kPa to 105 kPa. The apparatus accommodates flat-slab specimens 500 mm in diameter and from 13 mm to 100 mm in thickness. Fabrication and assembly details are presented for the apparatus hot and cold plates, guard system surrounding the plates, temperature sensors, metal-sheathed heaters, and vacuum/gas pressurization system. An initial assessment of the calibration uncertainties for the primary measurement sensors is presented.