Uncertainty of weight measuring systems applied to weighing lysimeters

Amaral, Alisson Macendo; Filho, Fernando Rodrigues Cabral; Vellame, Lucas Melo; Teixeira, Marconi Batista; Soares, Frederico Antônio Loureiro; Santos, Leonardo Nazário Silva dos

doi:10.1016/j.compag.2017.12.033

Cited by 10 publications

(5 citation statements)

References 22 publications

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“…Em estudo conduzido por Amaral et al (2018), avaliando diferentes sistemas de medição aplicados a lisímetros de pesagem por células de carga, os autores reportam uma incerteza teórica esperada de 0,260 Kg, 0,052% da leitura e, para uma evapotranspiração diária de 5 mm, um valor de 13,52%. Dessa forma, pelos valores encontrados no presente estudo, todos os lisímetros estão aptos para quantificar o consumo hídrico de uma cultura, bem como auxiliar em estratégias de manejo da irrigação.…”

Section: Resultsunclassified

Construção E Calibração De Lisímetros De Pesagem Em Ambiente Protegido

Amaral

Vellame

Teixeira

et al. 2018

RBAI

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Objetivou-se construir e calibrar 4 lisímetros de pesagem por célula de carga para uso em ambiente protegido (L1, L2, L3 e L4). Os lisímetros possuíam caçambas com área de 0,502 m² (L1 e L4) e 0,385 m² (L2 e L3) e eram compostos individualmente de 3 células de carga (CC) do tipo I, 3 suportes articulados, 1 caixa de junção e 1 módulo indicador de pesagem (MIP). Os dados de todos os MIP's eram armazenados em um datalogger. Os lisímetros foram calibrados dentro da faixa de operação e determinou-se a acurácia, por meio do erro máximo absoluto (EMA) e a incerteza geral da medição (I). Todos os lisímetros apresentaram excelente acurácia dentro da faixa esperada pela literatura (5 a 15%) que foram 3,89; 0,82; 1,92 e 6,13% para L1, L2, L3 e L4 respectivamente. Os lisímetros foram usados no manejo da irrigação em girassol sob as frações de 25, 50, 75 e 100% da água disponível no solo, determinando eficientemente o consumo hídrico nessas condições. Uma nova calibração foi feita após o ciclo do girassol e todos os equipamentos aumentaram a tendência dos desvios, resultado do esforço constante nas CC (fluência), evidenciando a necessidade de calibrações periódicas afim de verificar e compensar erros que se acentuam com tempo de operação.Palavras-chave: acurácia, sistema de medição, manejo CONSTRUCTION AND CALIBRATION OF WEIGHING LYSIMETERS IN PROTECTED ENVIRONMENT1 Extraído da dissertação do primeiro autor.

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Section: Resultsunclassified

Construção E Calibração De Lisímetros De Pesagem Em Ambiente Protegido

Amaral

Vellame

Teixeira

et al. 2018

RBAI

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“…Linearity represents the degree of consistency between the input-output curve and the calibration curve. The hysteresis and linearity values reflect the magnitude of the system error [37]. The results show that the values of the four indicators are all very small, so it can be inferred that the system has high measurement accuracy and low random and systematic errors.…”

Section: Measurement Systemmentioning

confidence: 95%

Influence of Piping on On-Line Continuous Weighing of Materials inside Process Equipment: Theoretical Analysis and Experimental Verification

Jing

Feng²,

Wang

et al. 2021

Applied Sciences

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Due to the continuity and complexity of chemical systems, piping and operating conditions will have a significant effect on the on-line continuous weighing of materials inside process equipment. In this paper, a mathematical model of the weighing system considering piping and operating conditions was established based on the gas–liquid continuous heat transfer weighing process. A theoretical criterion which can be extended to any continuous weighing system of the materials inside equipment with connected piping is obtained through the mechanical derivation between the material mass, the cantilever beam deflection, the strain gage deformation, and the bridge output voltage. This criterion can effectively predict the influence of piping on weighing results with specific accuracy, and provide a basis for engineering optimization design. On this basis, a set of gas–liquid continuous contact weighing devices was built. The static/dynamic experimental results showed that the accuracy of the system meets the set requirements.

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“…Recently, the development of the load cells and datalogger technology allows one to obtain high-precision weighing lysimeters [17,18]. These lysimeters can be used to determine evapotranspiration with measurement reliability [19], and an accuracy of hundredths of millimeters reducing investment and maintenance costs and making commercial use possible [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Removable Weighing Lysimeter for Use in Horticultural Crops

et al. 2020

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Water resources management is a priority issue in agriculture, especially in areas with water supply problems. Recently, one of the most widespread technologies for measuring crop water requirements are weighing lysimeters. Nevertheless, this type of lysimeters are of large dimensions and require a civil work for their installation. In this article, we present a weighing lysimeter prototype (1000 × 600 mm and 350 mm depth) designed to be used in agricultural farming of horticultural crops. We described the design details that includes ease of assembly, carriage and minimum soil alteration. Structural design results and construction process are also provided showing their performance under different tractors scenarios. The measurements accuracy results show the outcomes of the prototype after being tested. Finally, we discuss our design and measurements results by comparing them with other weighing lysimeters. In comparison, the prototype designed is an accurate and reliable device which reduces the surface and depth of the current weighing lysimeters.

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Uncertainty of weight measuring systems applied to weighing lysimeters

Cited by 10 publications

References 22 publications

Construção E Calibração De Lisímetros De Pesagem Em Ambiente Protegido

Construção E Calibração De Lisímetros De Pesagem Em Ambiente Protegido

Influence of Piping on On-Line Continuous Weighing of Materials inside Process Equipment: Theoretical Analysis and Experimental Verification

Removable Weighing Lysimeter for Use in Horticultural Crops

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