Digital Chemical Thermometers Vs Analog Thermometers


Authors : Fernando Angel Ortega Hernandez; Jose Luis Hernandez Corona; Aldo Castañeda Salmoran

Volume/Issue : Volume 7 - 2022, Issue 10 - October

Google Scholar : https://bit.ly/3IIfn9N

Scribd : https://bit.ly/3hEsukm

DOI : https://doi.org/10.5281/zenodo.7319087

The purpose of this project is the construction of a portable digital chemical thermometer and its comparison against analog thermometers to be applied as an experimental instrument in the chemistry laboratory where the temperature measurement is carried out in different chemical substances by students and teachers of the University. Technology of Tlaxcala. This article describes the comparison made after the construction of the digital chemical thermometer, a project carried out by students of the Industrial Maintenance career at the Technological University of Tlaxcala. First, a plastic structure was manufactured in a 3D printer, then an Atmel 328P microcontroller was used to control the thermometer, a 128x64 OLED screen to display the temperature, a J-type thermocouple adapted with a MAX6633 was used as a sensor that is responsible for obtaining temperature data and a recharging module for a rechargeable 9V lithium-ion battery. Its purpose is to obtain a precise temperature measurement of substances, thus being a more reliable and easy-to-use measuring instrument for the student community. Its design is a rectangular box-shaped structure, this design was made in the Solid Works design software, once the design was finished it was exported to the Ultimaker software to print it in 3D, then the different pieces were assembled by joining them with bolts for later, assembling the electronic circuit inside the box, programming the Atmel 328P microcontroller, and finally calibrating the J-type thermocouple. By performing comparative tests in ice water up to the boiling point at different temperatures against an analog mercury device, as well as a device of alcohol, it was possible to observe a great similarity in the values obtained, for which it was verified that the thermometer works correctly, is reliable and meets the needs of the university.

Keywords : Temperature, thermocouple, measuring instrument, and thermometer.

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