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Automatic carbon dioxide-methane gas sensor based on the solubility of gases in water.

Cadena-Pereda RO, Rivera-Muñoz EM, Herrera-Ruiz G, Gomez-Melendez DJ, Anaya-Rivera EK - Sensors (Basel) (2012)

Bottom Line: 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 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.

View Article: PubMed Central - PubMed

Affiliation: 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. omar.cadena@upq.edu.mx

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.

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Related in: MedlinePlus

The experimental interday device response (run 1 to run 5). In addition, a plot of the mathematical model with 4 moles of absorption liquid and a plot of the Calibration Sample are shown.
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f4-sensors-12-10742: The experimental interday device response (run 1 to run 5). In addition, a plot of the mathematical model with 4 moles of absorption liquid and a plot of the Calibration Sample are shown.

Mentions: Five calibration cycles were performed with each of the six gas mixtures and on different days to account for variable ambient conditions. In order to obtain the Accuracy, the critical value t was set to 2.776 and α is set to 0.05. The five runs, along with the plot of the data obtained from the model with 4.0 moles of water and a plot with the calibration gas mixture used, are shown in Figure 4. Interestingly, the experimental results with 5.148 moles of water were very similar to the results of the mathematical model with 4.0 moles of water. Such experimental behavior could be attributed to humidity content in the sample, interference of other substances diluted in the water used as the absorption liquid or to structural characteristics of the experimental device.


Automatic carbon dioxide-methane gas sensor based on the solubility of gases in water.

Cadena-Pereda RO, Rivera-Muñoz EM, Herrera-Ruiz G, Gomez-Melendez DJ, Anaya-Rivera EK - Sensors (Basel) (2012)

The experimental interday device response (run 1 to run 5). In addition, a plot of the mathematical model with 4 moles of absorption liquid and a plot of the Calibration Sample are shown.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472854&req=5

f4-sensors-12-10742: The experimental interday device response (run 1 to run 5). In addition, a plot of the mathematical model with 4 moles of absorption liquid and a plot of the Calibration Sample are shown.
Mentions: Five calibration cycles were performed with each of the six gas mixtures and on different days to account for variable ambient conditions. In order to obtain the Accuracy, the critical value t was set to 2.776 and α is set to 0.05. The five runs, along with the plot of the data obtained from the model with 4.0 moles of water and a plot with the calibration gas mixture used, are shown in Figure 4. Interestingly, the experimental results with 5.148 moles of water were very similar to the results of the mathematical model with 4.0 moles of water. Such experimental behavior could be attributed to humidity content in the sample, interference of other substances diluted in the water used as the absorption liquid or to structural characteristics of the experimental device.

Bottom Line: 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 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.

View Article: PubMed Central - PubMed

Affiliation: 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. omar.cadena@upq.edu.mx

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.

Show MeSH
Related in: MedlinePlus