Evaluation of platinum resistance thermometersAn evaluation procedure for the characterization of industrial platinum resistance thermometers (PRTs) for use in the temperature range -120 to 160 C was investigated. This evaluation procedure consisted of calibration, thermal stability and hysteresis testing of four surface measuring PRTs. Five different calibration schemes were investigated for these sensors. The IPTS-68 formulation produced the most accurate result, yielding average sensor systematic error of 0.02 C and random error of 0.1 C. The sensors were checked for thermal stability by successive and thermal cycling between room temperature, 160 C, and boiling point of nitrogen. All the PRTs suffered from instability and hysteresis. The applicability of the self-heating technique as an in situ method for checking the calibration of PRTs located inside wind tunnels was investigated.
Document ID
19890040312
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Daryabeigi, Kamran (NASA Langley Research Center Hampton, VA, United States)
Dillon-Townes, Lawrence A. (NASA Langley Research Center Hampton, VA, United States)