In this paper, we present the results of the evaluation of three low-cost
laser sensors and
comparison with the standard device Metone Aerocet 531s which is capable of
counting dust particles as small as 0.3 μm. The sensors used in this study are
PMS5003 (Plantower), SPS30 (Sesirion), SM-UART-04L (Amphenol). During the
measurement, the overall trend of the outputs from the sensors was similar to
that of the Aerocet 531s. The PMS5003 sensor has a relatively small standard
error in the all particle measurement ranges (<15 μg/m3 in the
low particle concentration range). All sensors have a high linearity compared
to 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 calibration
methods (single-point calibration, two-point calibration and multi-point curve
correction) with implementation steps for each method as well as their
practical applications in calibrating low-cost air quality sensors according to
standard measuring equipment are also detailed illustrated.
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