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Integration and calibration of NDIR CO 2 low-cost sensors, and their operation in a sensor network covering Switzerland
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mueller, Michael Graf, Peter Meyer, Jonas Pentina, Anastasia Dominik, Brunner Pérez-Cruz, Fernando Hueglin, Christoph Emmenegger, Lukas |
| Copyright Year | 2019 |
| Abstract | Abstract. More than 300 LP8 CO2 sensors were integrated into sensor units and evaluated for the purpose of long-term operation in the Carbosense CO2 sensor network in Switzerland. Prior to deployment, all sensors were calibrated in a pressure and climate chamber, and in ambient conditions co-located with a reference instrument. To investigate their long-term performance and to test different data processing strategies, 18 sensors were deployed at five locations equipped with a reference instrument after calibration. Their accuracy during 19 to 25 months deployment was between 8 to 12 ppm. This level of accuracy requires careful sensor calibration prior to deployment, continuous monitoring of the sensors, efficient data filtering, and a procedure to correct drifts and jumps in the sensor signal during operation. High relative humidity (> ∼85 %) impairs the LP8 measurements, and corresponding data filtering results in a significant loss during humid conditions. The LP8 sensors are not suitable for the detection of small regional gradients and long-term trends. However, with careful data processing, the sensors are able to resolve CO2 changes and differences with a magnitude larger than about 20 ppm. Thereby, the sensor can resolve the site-specific CO2 signal at most locations in Switzerland. A low power network (LPN) using LoRaWAN allowed reliable data transmission with low energy consumption, and proved to be a key element of the Carbosense low-cost sensor network. |
| Starting Page | 1 |
| Ending Page | 25 |
| Page Count | 25 |
| File Format | PDF HTM / HTML |
| DOI | 10.5194/amt-2019-408 |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-408/amt-2019-408.pdf |
| Alternate Webpage(s) | https://www.atmos-meas-tech-discuss.net/amt-2019-408/amt-2019-408-supplement.pdf |
| Alternate Webpage(s) | https://doi.org/10.5194/amt-2019-408 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
