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Precision and Limits of Detection for Selected Commercially Available, Low-Cost Carbon Dioxide and Methane Gas Sensors

Department of Chemistry, Oklahoma State University, 107 Physical Sciences, Stillwater, OK 74078, USA
Department of Civil Engineering, Oklahoma State University, 319C Engineering South, Stillwater, OK 74078, USA
Author to whom correspondence should be addressed.
Current address: University of Oklahoma Biological Survey, 111 Chesapeake St., Norman, OK 73019, USA.
Sensors 2019, 19(14), 3157;
Received: 11 June 2019 / Revised: 3 July 2019 / Accepted: 15 July 2019 / Published: 18 July 2019
(This article belongs to the Section Chemical Sensors)
The performance of a sensor platform for environmental or industrial monitoring is sensitive to the cost and performance of the individual sensor elements. Thus, the detection limits, accuracy, and precision of commercially available, low-cost carbon dioxide and methane gas concentration sensors were evaluated by precise measurements at known gas concentrations. Sensors were selected based on market availability, cost, power consumption, detection range, and accuracy. A specially constructed gas mixing chamber, coupled to a precision bench-top analyzer, was used to characterize each sensor during a controlled exposure to known gas concentrations. For environmental monitoring, the selected carbon dioxide sensors were characterized around 400 ppm. For methane, the sensor response was first monitored at 0 ppm, close to the typical environmental background. The selected sensors were then evaluated at gas concentrations of several thousand ppm. The determined detection limits accuracy, and precision provides a set of matrices that can be used to evaluate and select sensors for integration into a sensor platform for specific applications. View Full-Text
Keywords: sensor systems and applications; carbon dioxide; methane sensor systems and applications; carbon dioxide; methane
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MDPI and ACS Style

Honeycutt, W.T.; Ley, M.T.; Materer, N.F. Precision and Limits of Detection for Selected Commercially Available, Low-Cost Carbon Dioxide and Methane Gas Sensors. Sensors 2019, 19, 3157.

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