Performance Evaluation of Four Commercial Optical Particle Counters

Franco Belosi, Gianni Santachiara, Franco Prodi

Institute of Atmospheric Sciences and Climate (ISAC), National Research Council, Bologna, Italy.

DOI: 10.4236/acs.2013.31006                

Abstract

The performances of four optical particles counters, Aerosol Spectrometer (Grimm 1.108), Enviro Check (Grimm 1.107), DustMonit and ParticleScan, were evaluated in laboratory tests employing monodisperse aerosol particles. The study focused on how commercial instruments perform during routine measurements respect to OPC scientific understanding, because it is important for users of such instruments to be aware of their limitations. Measurements were performed using aerosol generated by a Monodisperse Aerosol Generator (MAGE), which produced carnauba wax particles of diameter (1.00 ± 0.08) μm and (1.40 ± 0.15) μm, and monodisperse Polystyrene Latex (PSL) aerosol with nominal diameter of 1.0mm. The results show comparable total particle number concentrations for all the counters, when the count of the first size channel (0.3 - 0.4 μm) for the 1.108 Grimm counter was left out. In the said channel the Grimm counter 1.108 always showed much higher particle counts than those inferred from the tested aerosols. The overcount was proved by the fact that the aerosol sampled in each test on a Nuclepore filter showed no particles in the 0.3 - 0.4 μm range when examined under Scanning Electronic Microscope (SEM). The presence of an artefact produced by the counter was assumed as a likely explanation. For all the counters, the Count Median Diameters (CMDs) of aerosol size distributions, were far below the expected value for the aerosol used. The nearest CMD values to the expected ones were shown by the Grimm 1.107 counter.

Keywords

Optical Particle Counter; Air quality; Aerosol Size Distribution

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J. Gebhart, “Optical Direct-Reading Techniques: Light Intensity Systems,” In: P. A. Baron and K. Willeke, Eds., Aerosol Measurement, Van Nostrand Reinhold, New York, 1993, pp. 313-344.
[2]	B. T. Chen, Y. S. Cheng and H. C. Yeh, “Experimental Response of Two Optical Particle Counters”, Journal of Aerosol Science, Vol. 15, No. 4, 1984, pp. 457-464. doi:10.1016/0021-8502(84)90041-7
[3]	H. Y. Wen and G. Kasper, “Counting Efficiencies of Six Commercial Particle Counters,” Journal of Aerosol Science, Vol. 17, No. 6, 1986, pp. 947-961. doi:10.1016/0021-8502(86)90021-2
[4]	M. Heim, B. J. Mullins, H. Umhauer and G. Kasper, “Performance Evaluation of Three Optical Particle Counters with an Efficient “Multimodal” Calibration Method,” Journal of Aerosol Science, Vol. 39, No. 12, 2008, pp. 1019-1031. doi:10.1016/j.jaerosci.2008.07.006
[5]	A. Tittarelli, A. Borgini, M. Bertoldi, E. De Saeger, A. Ruprecht, R. Stefanoni, G. Tagliabue, P. Contiero and P. Crosignani, “Estimation of Particle Mass Concentration in Ambient Air Using a Particle Counter,” Atmospheric Environment, Vol. 42, No. 36, 2008, pp. 8543-8548. doi:10.1016/j.atmosenv.2008.07.056
[6]	H. Grimm and D. J. Eatough, “Aerosol Measurement: The Use of Optical Light Scattering for the Determination of Particulate Size Distribution, and Particulate Mass, including Semi-Volatile Fraction,” Journal of Air Waste Management Association, Vol. 59, No. 1, 2009, pp. 101-107. doi:10.3155/1047-3289.59.1.101
[7]	V. Prodi, “A Condensation Aerosol Generator for Solid Monodisperse Particles,” In: T. T. Mercer, P. E. Morrow and W. Stoeber, Eds., Assessment of Airborne Particles, Charles C Thomas Publisher, New York, 1972, pp. 169-181.
[8]	V. Prodi and W. Molter, “Temperature Characteristics of a Monodisperse Aerosol Condensation Generator, Aerosols: Formation and Reactivity,” Proceedings of the 2nd International Aerosol Conference, Berlin, 22-26 September 1986, pp. 1065-1068.
[9]	Y. J. Yoon, S. Cheevers, S. G. Jenings and C. D. O’Dowd, “Performance of a Venturi Dilution Chamber for Sampling 3 - 20 nm Particles,” Journal of Aerosol Science, Vol. 36, No. 4, 2005, pp. 535-540. doi:10.1016/j.jaerosci.2004.10.004
[10]	K. D. Horton, R. D. Miller and J. P. Mitchell, “Characterization of a Condensation-Type Monodisperse Aerosol Generator (MAGE),” Journal of Aerosol Science, Vol. 22, No. 3, 1991, pp. 347-363. doi:10.1016/S0021-8502(05)80012-6
[11]	K. T. Whitby and B. Y. H. Liu, “Polystyrene Aerosols—Electrical Charge and Residue Size Distribution,” Atmospheric Environment, Vol. 2, No. 2, 1968, pp. 103-116. doi:10.1016/0004-6981(68)90026-7
[12]	Th. Tuch, E. Tamm, J. Heinrich, J. Heyder, P. Brand, Ch. Roth, H. E. Wichmann, J. Pekkanen and W. G. Kreyling, “Comparison of Two Particle-Size Spectrometers for Ambient Aerosol Measurements,” Atmospheric Environment, Vol. 34, No. 1, 2000, pp.139-149. doi:10.1016/S1352-2310(99)00248-4
[13]	L. Moraswka, G. Johnson, Z. D. Ristovski and V. Agranovski, “Relation between Particle Mass and Number for Submicrometer Airborne Particles,” Atmospheric Environment, Vol. 33, No. 13, 1999, pp. 1983-1990. doi:10.1016/S1352-2310(98)00433-6
[14]	J. Burkart, G. Steiner, G. Reischel, H. Moshammer, M. Neuberger and R. Hitzenberger, “Characterizing the Performance of Two Optical Particle Counters (Grimm OPC1.108 and OPC1.109) under Urban Aerosol Conditions,” Journal of Aerosol Science, Vol. 41, No. 10, 2010, pp. 953-962. doi:10.1016/j.jaerosci.2010.07.007