Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..684..951m&link_type=abstract
TEMPERATURE: Its Measurement and Control in Science and Industry; Volume VII; Eighth Temperature Symposium. AIP Conference Proc
Other
Heat Engines, Heat Pumps, Heat Pipes, Thermometers, Liquid-Vapor Transitions
Scientific paper
Two gas-controlled heat-pipes, one working with mercury and the other with sodium, have been connected to the same helium pressure line. At any given pressure, the high temperature of the sodium heat-pipe is thermodynamically related to the low temperature of the mercury heat-pipe. Pressure control well within 1 ppm is obtained in both devices by using a 25 Ω SPRT inserted in the thermometer well of the mercury heat-pipe. A computer controls the helium pressure by operating input/output electrovalves and a variable volume. With such a system, helium pressures between 8 kPa and 200 kPa are controlled with a sensitivity well beyond the resolution of currently available pressure gauges, thus reaching a temperature stability in the mercury heat-pipe at a level of about 0.2 mK. The very high reproducibility of the 25 Ω SPRT used in the mercury heat-pipe between 240 °C and 400 °C, within 2.10-7, is transferred with this amplification system to higher temperatures, thus obtaining in the sodium heat-pipe between 660°C and 961°C a reproducibility better than can be obtained with high temperature standard platinum resistance thermometers. An accurate measurement of the thermodynamic relationship between the ITS-90 temperatures of the two substances at their liquid-vapour transitions at identical pressure values has been done and the results are hereby presented. The reproducibility of this ``temperature amplifier'' is then compared with measurements at the fixed points.
Marcarino P.
Merlone A.
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