DGI–1570 (Dekati® Gravimetric Impactor) is a high sample flow rate cascade impactor designed for measuring gravimetric particle size distribution of particles < 2.5 μm. In a standard DGI setup particles are size classified into 5 size fractions with impactor stage cutpoints of 2.5, 1.0, 0.5 and 0.2 μm. If detailed information on the size distribution is not needed, some of the impactor stages can be removed from the DGI assembly. The impactor can e.g. be used without the 0.5 and 0.2 to stages to determine only PM₂.₅ and PM₁.₀ concentrations. The nominal sample flow rate though the DGI is 70 lpm which enables high sample yield even during short measurement periods. Typical measurement applications of the DGI impactor include engine emission measurements, air quality studies and other applications where high sample flow rate is needed.
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