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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Quantification of uncertainty in temperature measurements with thermocouple and Arduino® compatible hardware
Submission Author:
Felipe dos Anjos Rodrigues Campos , MG
Co-Authors:
Felipe dos Anjos Rodrigues Campos, Kenji Fabiano Ávila Okada, Leonardo Rosa Ribeiro da Silva , Álisson Rocha Machado, Harumi Otaguro
Presenter: Felipe dos Anjos Rodrigues Campos
doi://10.26678/ABCM.ENCIT2020.CIT20-0792
Abstract
Temperature is a key aspect in the control of processes in engineering. The measurement, however, must take into account not only the accuracy of the sensor but also the implementation costs and uncertainty. Thermocouples are one of the most widely used temperature measurement methods combining low costs, high measurement ranges and relatively good accuracy. The acquisition system, however, is usually expensive. In this paper it was evaluated the uncertainty in the temperature measurements of a K-type thermocouple using low cost Arduino® compatible hardware as data acquisition system. This set was calibrated using a thermostatic distilled water bath at both freezing and boiling phase change points. The equations for uncertainty calculation were fully developed and the procedures described serve as reference for uncertainty assessment for thermocouples with other data acquisition systems. Although the calibration and limited resolution were the greatest contributors, the low variability of measurements shows the system has good stability and is a fine choice for industrial applications. The calculations are easy to implement as a routine for several measurements and guarantee traceability of results up to the international reference standard.
Keywords
uncertainty measurement, GUM framework, Thermocouple Calibration, Arduino® microcontroller, MAX31855 module
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