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

机译:选定的商用低成本二氧化碳和甲烷气体传感器的精度和检测极限

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摘要

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.
机译:用于环境或工业监控的传感器平台的性能对单个传感器元件的成本和性能很敏感。因此,通过在已知气体浓度下的精确测量来评估可商购的低成本二氧化碳和甲烷气体浓度传感器的检测极限,准确性和精密度。根据市场可用性,成本,功耗,检测范围和准确性选择传感器。在与已知气体浓度的受控接触下,使用了一个特殊构造的气体混合室,该室与精密的台式分析仪相连,以表征每个传感器的特性。对于环境监测,选定的二氧化碳传感器的特征约为400 ppm。对于甲烷,首先在0 ppm处监测传感器响应,接近典型的环境背景。然后在几千ppm的气体浓度下评估选定的传感器。确定的检测限制了准确性,而精度提供了一组矩阵,可用于评估和选择传感器,以集成到特定应用的传感器平台中。

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