Argon Triple-Point Device to Calibrate Long-Stem Thermometers in Quasi-Adiabatic Conditions

Ahmed, Mohamed Gamal; Hermier, Y.; Moussa, MagdyS; Bonnier, G.

doi:10.1063/1.1627124

Cited by 2 publications

(3 citation statements)

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“…The predominant contribution to the uncertainty in the difference is due to the variability of the Ar-IMGC system. This could be attributed to the influence of atmospheric-pressure variations or heat flux variations along thermometric well, as pointed out by other authors [3][4][5].…”

Section: Discussionmentioning

confidence: 59%

“…The distance between the free argon level and the lower end of the thermometer well is 75 ± 5 mm. Further information about the design can be found in [2][3][4].…”

Section: Ar-imgc Systemmentioning

confidence: 99%

“…In most European metrology institutes its realization is still based on the device designed by BNM-INM in 1975 [2,3]. This system is reliable and easy to use which has made it famous and operational all over the world for many years although some improvements have been proposed over time to overcome some of its inconveniences such as the influence of atmospheric-pressure variations and the change in hydrostatic pressure [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Realisation of the triple-point of Argon: comparison between two devices

Lopardo,

Dematteis,

Steur

2024

Phys. Scr.

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A new cryostat for the realization of the triple-point of the argon (83.8058 K), a defining fixed point of the International Temperature Scale of 1990 (ITS-90), was acquired at Italian National Metrological Institute (INRiM). The new system, manufactured by Fluke, is intended to substitute the current National reference, a model developed at BNM-INM in the 1975. The main difference between the two system is in the way to control the temperature. In the BNM-INM device the temperature is controlled adjusting the pressure of liquid nitrogen bath, in the Fluke system instead, an electrical heater wrapped around the argon cell is used, following cryogenic practice. This paper describes the result of the direct comparison and shows typical phase transitions obtained with the two argon systems. Then, a complete uncertainty budget is evaluated for the new Fluke system and compared with the National standard.

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Section: Discussionmentioning

confidence: 59%

“…The distance between the free argon level and the lower end of the thermometer well is 75 ± 5 mm. Further information about the design can be found in [2][3][4].…”

Section: Ar-imgc Systemmentioning

confidence: 99%