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Development of a Standard Platinum Resistance Thermometer for Use up to the Copper Point.
- Source :
-
International Journal of Thermophysics . Aug2015, Vol. 36 Issue 8, p2027-2035. 9p. - Publication Year :
- 2015
-
Abstract
- The international temperature scale of 1990 defines temperatures in the range from 13.8 K to 1234.93 K ( $$961.78\,^{\circ }\hbox {C}$$ ) using a standard platinum resistance thermometer (SPRT) as an interpolating instrument. For temperatures above $$660\,^{\circ }\hbox {C}$$ , the current designs of an SPRT require extreme care to avoid contamination, especially by metallic impurities, which can cause rapid and irreversible drift. This study investigates the performance of a new design of a high-temperature SPRT with the aim of improving the stability of the SPRTs and extending their temperature range. The prototype SPRTs have an alumina sheath, a sapphire support for the sensing element, which are aspirated with dry air and operated with a dc bias voltage to suppress the diffusion of metal-ion contaminants. Three prototype thermometers were exposed to temperatures near or above the copper freezing point, $$1085\,^{\circ }\hbox {C}$$ , for total exposure times in excess of 500 h and exhibited drifts in the triple-point resistance of less than 10 mK. The new design eliminates some of the problems associated with fused-silica sheaths and sensor-support structures and is a viable option for a high-accuracy thermometer for temperatures approaching $$1100\,^{\circ }\hbox {C}$$ . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0195928X
- Volume :
- 36
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- International Journal of Thermophysics
- Publication Type :
- Academic Journal
- Accession number :
- 109171663
- Full Text :
- https://doi.org/10.1007/s10765-015-1937-9