DMAs: Using Different Models with the Classifier 4–3
Figure 4-2
Schematic Diagram of Long DMA (drawing not to scale)
Model 3085 Nano DMA
The Nano DMA, as shown in Figure 4-3, is optimized for the size
range below 20 nm. However, it covers a broad range of particle
diameters from 2 to 150 nm.
The Nano-DMA is an extensive modification of the Long-DMA to
optimize its performance with small particles. Although the Nano
DMA is similar to the Long DMA, it has many important differences
explained below (refer to Figure 4-4).
For the Nano DMA. the center electrode has an outer radius of
0.369 in. (0.937 cm) and the grounded outer electrode has an inner
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