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Experimental Study of the Triple Point of Argon System

A new triple point of argon system with multiple re-entrant wells was developed for calibration of long-stem standard platinum resistance thermometers (SPRTs). In order to further evaluate this triple point of argon system, a series of tests was carried out recently. The influence of the pre-melting duration on the triple point plateau temperature was studied. The vertical temperature gradient of the re-entrant wells and the temperature uniformity of the four re-entrant wells were tested. The immersion profile of the re-entrant wells was studied and compared to the ITS-90 hydrostatic values. The influence of the environment temperature on the performance of the argon plateau was also investigated. The experimental results show that the temperature of the four re-entrant wells is uniform. The tested immersion profile of the re-entrant wells reasonably agrees with the ITS-90 values. The environment temperature does not affect the plateau temperature in the tested environment temperature range of 13.0°C – 30.0°C. The pre-melting duration slightly affects the plateau temperature in the beginning of the plateau, but after 10 hours the influence of the pre-melting duration on the plateau temperature is insignificant.