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Sensors 2012, 12(8), 10742-10758; doi:10.3390/s120810742
Article

Automatic Carbon Dioxide-Methane Gas Sensor Based on the Solubility of Gases in Water

1,2,* , 3
,
4
,
2
 and
2
1 Laboratorio de Biotrónica, Departamento de Investigación y Posgrado, Facultad de Ingeniería, Universidad Autónoma de Querétaro, Centro Universitario Cerro de las Campanas S/N, Querétaro 76010, Mexico 2 Universidad Politécnica de Querétaro, Carretera Estatal 420 S/N, El Rosario, C.P. 76240, El Marqués, Querétaro 76010, Mexico 3 Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma de México, A. P. 1-1010, Querétaro 76000, Mexico 4 Facultad de Ingeniería, Universidad Autónoma de Querétaro, Centro Universitario Cerro de las Campanas S/N, Querétaro 76010, Mexico
* Author to whom correspondence should be addressed.
Received: 1 July 2012 / Revised: 31 July 2012 / Accepted: 2 August 2012 / Published: 6 August 2012
(This article belongs to the Section Chemical Sensors)
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Abstract

Biogas methane content is a relevant variable in anaerobic digestion processing where knowledge of process kinetics or an early indicator of digester failure is needed. The contribution of this work is the development of a novel, simple and low cost automatic carbon dioxide-methane gas sensor based on the solubility of gases in water as the precursor of a sensor for biogas quality monitoring. The device described in this work was used for determining the composition of binary mixtures, such as carbon dioxide-methane, in the range of 0–100%. The design and implementation of a digital signal processor and control system into a low-cost Field Programmable Gate Array (FPGA) platform has permitted the successful application of data acquisition, data distribution and digital data processing, making the construction of a standalone carbon dioxide-methane gas sensor possible.
Keywords: reconfigurable logic; gas solubility; binary gas sensor; mathematical model reconfigurable logic; gas solubility; binary gas sensor; mathematical model
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Cadena-Pereda, R.O.; Rivera-Muñoz, E.M.; Herrera-Ruiz, G.; Gomez-Melendez, D.J.; Anaya-Rivera, E.K. Automatic Carbon Dioxide-Methane Gas Sensor Based on the Solubility of Gases in Water. Sensors 2012, 12, 10742-10758.

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