Browsing by Author "Siza Tigse, Kevin Alexander"

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    Aplicación del protocolo hart en el proceso de calibración de transmisores de temperatura
    (Universidad Técnica de Cotopaxi (UTC). Facultad de Ciencias de la Ingeniería y Aplicadas. Electromecánica, 2026-10-14) Siza Tigse, Kevin Alexander; Tigasi Licto, Jairo Israel; Freire Martínez, Luigi Orlando
    The objective of this research was to apply a technical procedure using the HART protocol for the calibration of a temperature transmitter in order to identify the stage requiring intervention, apply the available adjustment, and quantitatively evaluate the error in the primary variable. The problem addressed was that verification based solely on the 4–20 mA signal did not clearly identify the source of the measurement error. Therefore, HART communication was used to access the transmitter’s internal information and complement the evaluation. The study was conducted experimentally over a range of 0 to 100 °C, using a precision potentiometer as a resistive simulator of a Pt100 sensor. The equivalent resistance values were determined from the resistance–temperature relationship established in IEC 60751. Five points corresponding to 0%, 25%, 50%, 75%, and 100% of the range were evaluated. The reference temperature, Primary Variable (PV), and analog output were recorded using a HART 475 OEM communicator, and the PV error was calculated as the difference between the measured value and the reference value, in accordance with JCGM 200:2012. Before the Zero PV adjustment, the errors were +0.14 °C, +0.14 °C, +0.26 °C, +0.29 °C, and +0.21 °C. After the adjustment, they decreased to +0.02 °C, +0.01 °C, +0.02 °C, +0.01 °C, and +0.02 °C, respectively, and remained within the ±0.1% full-scale limit specified for the transmitter. As a contribution, a procedure for verification, diagnosis, adjustment, and post-adjustment verification using HART was established, which could be used as a guide for instrumentation laboratory practices. It was concluded that the HART protocol enabled a technical intervention based on the comparison between the PV and its reference value and allowed the reduction in measurement error after the adjustment to be quantitatively verified.