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Implementation of a new measurement system for contact thermometer calibration by fixed points at the instituto nacional de metrología
Implementación de un nuevo sistema de calibración de termómetros de contacto por puntos fijos en el instituto nacional de metrología
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Implementation of a new measurement system for contact thermometer calibration by fixed points at the instituto nacional de metrología. (2023). Revista EIA, 20(39), 3922 pp. 1-18. https://doi.org/10.24050/reia.v20i39.1639
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In this work, we present the implementation process of a new measurement system for contact thermometer calibrations based on the application of the method proposed in the International Temperature Scale of 1990 (ITS - 90) in the sub-range covered from the triple point of water (H2O, 0,01 °C) to the freezing point of indium (In, ~156,59 °C), and the sub-range covered from the triple point of water to the freezing point of tin (Sn, ~231,928 °C). After the design, fabrication and evaluation of a home-made sealed indium fixed point cell in the Instituto Nacional de Metrología de Colombia, it was possible to obtain a thermometric standard to include the calibration of SPRTs (Standard Platinum Resistance Thermometer) and Pt100 thermometers by the ITS-90 method (commonly known as the Fixed Points calibration method) within the service portfolio of the Temperature and Humidity Laboratory of the Physical Metrology Subdivision. This type of services had not been previously offered by INM to the network of accredited laboratories of Colombia. A calibration exercise completed with the use of the new temperature standard allowed us to conclude that the total expanded uncertainty accomplished by the laboratory with this system is 3,0 mK for the sub-range H2O-In and 5,4 mK for the sub-range H2O-Sn.
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