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Study on the Realization of Zinc Point
J. V. Widiatmo,M. Sakai,K. Yamazawa,K. Satou,J. Tamba,M. Arai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Two zinc-point cells were fabricated using high grade zinc samples, impurity elements of one of which were analyzed extensively. Temperature measurements during the solid-liquid coexistence, under which the zinc fixed-point is defined, were conducted, the result of which was used to perform a thermal analysis. Comparisons of zinc-point temperature realized within the newly fabricated cells were also conducted. Zinc-point depression due to impurity elements was calculated based on the chemical element analysis. Evaluation was made on the thermal analysis, the cell comparison results and the chemical element analysis, to lead to an estimation of uncertainty caused by the impurity elements. The present paper outlines the cell fabrication, the temperature measurements and the evaluation of impurity effect to the zinc-point realization.
K. Yamazawa,K. Anso,J. V. Widiatmo,M. Arai 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes the preliminary measurements of the precise comparison between a radiation thermometer and a platinum resistance thermometer (PRT). The aim of this work is to measure the resistance -temperature relation of standard platinum resistance thermometers at temperatures above the present upper limit (961.78??C) of PRTs. The comparison furnace is placed in horizontal orientation, and a graphite block is placed in the center as acomparison block. In this paper, preliminary measurement results for the evaluation of the uncertainty in the comparisonmeasurement are reported. First, the results of the comparison using the design configuration determined in our previouspaper are reported. Upon the measurements of three independent experimental rounds, we suspected that the design of the comparison block needed some improvements. We re-designed the comparison block, and also report the comparison results obtained using this improved version.