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Evaluating Low-Cost Commercially Available Sensors for Air Quality Monitoring and Application of Sensor Calibration Methods for Improving Accuracy

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Document pages: 17 pages

Abstract: In this paper, we present the results of the evaluation of three low-costlaser sensors andcomparison with the standard device Metone Aerocet 531s which is capable ofcounting dust particles as small as 0.3 μm. The sensors used in this study arePMS5003 (Plantower), SPS30 (Sesirion), SM-UART-04L (Amphenol). During themeasurement, the overall trend of the outputs from the sensors was similar tothat of the Aerocet 531s. The PMS5003 sensor has a relatively small standarderror in the all particle measurement ranges (3 in thelow particle concentration range). All sensors have a high linearity comparedto data from standard equipment, PMS5003: PM1.0 R2 = 0.89; PM2.5 R2 = 0.95; PM10 R2 = 0.87; SPS30 PM2.5 R2 = 0.95 and PM10 R2 = 0.99; SM-UART-04L PM1.0 R2 = 0.98. Three main sensor calibrationmethods (single-point calibration, two-point calibration and multi-point curvecorrection) with implementation steps for each method as well as theirpractical applications in calibrating low-cost air quality sensors according tostandard measuring equipment are also detailed illustrated.

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