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Aerosol Chamber Characterization for Commercial Particulate Matter (PM) Sensor Evaluation

Category: Aerosol Physics and Instrumentation

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DOI: 10.4209/aaqr.2017.12.0611
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Dian Ahmad Hapidin1,3, Casmika Saputra1,3, Dian Syah Maulana1,3, Muhammad Miftahul Munir 1,2,3, Khairurrijal Khairurrijal 1,2,3

  • 1 Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia
  • 2 Research Center for Biosciences and Biotechnology, Institute for Research and Community Services, Institut Teknologi Bandung, Bandung 40132, Indonesia
  • 3 Research Center for Disasters Mitigation, Institute for Research and Community Services, Institut Teknologi Bandung, Bandung 40132, Indonesia

Highlights

PM concentration decay inside an aerosol chamber was studied.
An empirical formula for describing PM concentration decay profile was obtained.
The empirical formula predicted the experiment time and the number of data points.
PM sensors performance evaluation procedures inside the aerosol chamber was presented.
PM sensor linearity, calibration curve, and precision were characterized.


Abstract

The adverse negative impact of PM2.5 exposure has encouraged the development of scattering-based PM sensors for monitoring the PM level spatially and temporally. The PM sensors excel in cost, operating power, and compactness but their performances need to be evaluated individually. The evaluation of PM sensors can be conducted inside an aerosol chamber by measuring the PM concentration in time series using the PM sensors and reference monitors. However, the experiment processes were time-consuming, as it needed a long time to decrease the PM concentration by loss mechanisms. We designed an aerosol chamber with the introduction of an output airflow rate to decay the PM concentration faster. The characterization of the chamber yielded an empirical equation to describe the PM concentration decay profile, which can be used to predict the measurement time and the number of data points. The chamber was then utilized to evaluate three PM sensors (Sharp GP2Y1010AU0F, Winsen ZH03A, and Novafitness SDS011). A condensation particle counter (TSI, 3025A) and particle sensor (Honeywell, HPMA115S0-XXX) were employed as reference monitors. The evaluation determined linearity, calibration curve, and precision of the PM sensors. The evaluated PM sensors showed excellent linearity with R2 above 0.956. Least square and RMA correlation of the evaluated PM sensors demonstrated the best linearity achieved at low PM measurement range (0–400 µg m–3). As the Winsen ZH03A or Novafitness SDS011 sensor had a coefficient of variation below 10%, both of the sensors have an acceptable precision according to the EPA standard.

Keywords

Aerosol chamber Air pollution Particulate matter PM2.5 monitor PM sensor


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