Design, development and application of a real‑time capacitive sensor for automatically measuring liquid level
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SN Applied Sciences
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In the present study a real-time capacitive sensor based on a capacitance step method is designed, developed and
applied on measuring the liquid level by immersion. The capacitive sensor consists of two electrodes from copper plated
phenolite plates separated by a gap distance and mounted inside a non-conductive storage tank. Water is used as the
dielectric material. The analyzed sensor behavior with liquid level variation is semi-linear and obtained in function of the
output voltage variation by using proper signal conditioning circuit. For converting the voltage variation into level variation,
a parallel R–C circuit is used instead of conventional bridge circuit. Under suitable parameter settings it provided
good reading accuracy. The experimental results demonstrate the high efficiency of the proposed model, which confirm
the satisfactory performance of the capacitive sensor for liquid level measurement. The sensor presents an excellent ease
of construction and installation, linked to the good measurements precision and high autonomy of system operation. The
behavior experiments under different salt concentrations show that the water chemical composition does not interfere
on the sensor operation. The proposed model exhibits a promising employment in several applications, such as control
equipment for irrigation, biomedical area—in the interaction between antibody–antigen or protein-DNA, aerospace
and pharmaceutical industry, gas sensors, and automation solutions.
Como referenciar
BENTO, RODRIGO T.; SILVA, ROGER W.O.; DIAS, LUCAS A.; FERRUS FILHO, ANDRE; PITTA, ANTONIO J.C. Design, development and application of a real‑time capacitive sensor for automatically measuring liquid level. SN Applied Sciences, v. 1, n. 7, 2019. DOI: 10.1007/s42452-019-0770-3. Disponível em: http://repositorio.ipen.br/handle/123456789/30401. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.