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Assessment of two condensation particle counters (CPCs) in photometric mode for high concentration exhaust emission measurements

Giechaskiel Barouch, Melas Anastasios, Mamakos Athanasios

Combustion Engines

2023

R. 62, nr 2

15--23

Condensation particle counters (CPCs) use light scattering to count particles after they have grown to micron size in a supersaturated environment. In single counting mode each particle is counted depending on whether the scattered light exceeds a threshold value or not. In photometric mode the total scattered light is converted in particle number concentration. While for laboratory grade particle number systems, CPCs are allowed to operate only in single counting mode, there is no such requirements for portable emissions measurements systems (PEMS) for real-driving emissions (RDE) testing or for instruments for periodic technical inspection (PTI) of vehicles. In this study two CPCs of the same model were assessed in single counting and photometric modes with silver and graphite particles with sizes ranging from 10 nm to 100 nm. The results showed that the concentration was measured accurately enough for particles in the 25 nm to 50 nm size range, but was underestimated and overestimated for smaller and larger particles, respectively. The key message is that the photometric mode should be avoided or calibrated in function of concentration and particle size.

Solid particle counting with HORIBA analyzer

Golomb P

Silniki Spalinowe

2009

R. 48, SC1

387--390

Due to the new European Emission Euro5 Regulation, car and engine producers are obliged to indicate and respect the number of the solid particles in the emission exhaust. This does not only apply to CI engines, like in the past, but now also to SI engines. In this article, the method for solid particle counting used by HORIBA as well as the particle counter developed by HORIBA is described. Author took part in the process of coming into being of mentioned apparatus.

Zgodnie z przepisami nowej normy EURO 5, producenci samochodów i silników są zobowiązani do przestrzegania limitów cząstek stałych zawartych w emitowanych spalinach. Odnosi się to nie tylko do silników z zapłonem samoczynnym (CI), ale obecnie także do silników z zapłonem iskrowym (SI). W niniejszym artykule opisano nową metodę pomiaru emisji cząstek stałych w spalinach silnika. Autor uczestniczył w procesie powstawania przedstawionego w analizatora MEXA-1000SPCS, w którym zastosowano opisaną metodę badawczą.