Título:	Feasibility study of the S5-E200 sensor for evapotranspiration monitoring in class a evaporation pans.
Autoria:	COSTA, D. R. da TAVARES, S. R. de L.
Afiliação:	DANIELA ROGONSKY DA COSTA, UNIVERSIDADE FEDERAL FLUMINENSE; SILVIO ROBERTO DE LUCENA TAVARES, CNPS.
Ano de publicação:	2025
Referência:	In: WORKSHOP ON BIOSYSTEMS ENGINEERING, 11., 2025, Niterói. Proceedings [...]. Niterói: AGRHA Consulting, 2025. p. 58-63. WEB 11.0.
Conteúdo:	This study evaluates the feasibility of the commercial sensor S5-E200 as an alternative to the traditional micrometric screw used in Class A evaporation pans for estimating reference evapotranspiration (ETo). Commonly employed in fuel tanks, the sensor was coupled to an Arduino microcontroller and subjected to controlled experimental tests. Four repetitions were conducted, with measurements taken at every 1 mm variation in water level, totalling 171 distinct levels and 684 readings per treatment. The data were organized in spreadsheets and analyzed statistically, calculating the arithmetic mean and standard deviation for each level. Results showed that although the sensor was capable of detecting changes in water column height, it lacked the sensitivity required to detect precise 1 mm variations—an essential criterion for reliable ETo estimation. The treatment using a digital multimeter demonstrated greater stability, with an average standard deviation of 0.05 ohms, while the automated Arduino system exhibited higher variability, with an average standard deviation of 8.5 ohms. This fluctuation is attributed to the indirect method of resistance calculation, based on voltage readings and an external resistor. It is concluded that the S5-E200 sensor is not suitable for direct replacement in Class A pans but may be useful in less demanding water monitoring systems, such as reservoir management or low-complexity irrigation, provided it is properly calibrated and adapted to specific operating conditions.
Thesagro:	Evapotranspiração
Palavras-chave:	Arduino Measurement automation Low-cost sensor Agricultural instrumentation
Tipo do material:	Artigo em anais e proceedings
Acesso:	openAccess
Aparece nas coleções:	Artigo em anais de congresso (CNPS)