TSI Instruments SMPS 3938 User Manual

1-8 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
The central electrode has an outer radius of 0.369 in (0.937 cm) and is
coaxial with the outer electrode which has an inner radius of 0.772 in
(1.961 cm). The characteristic length is 17.468 in (44.369 cm).
Note: The characteristic length of a DMA is defined as the length between
the middle of the inlet slit to the middle of the outlet slit. But, since
the inlet slit is formed by a sharp edge and a radius, the midpoint of
the inlet slit is defined as the middle of the shortest distance between
the edge and the radius projected to a vertical line.
Nano DMA and 1nm-DMA
The Model 3085A Nano DMA provides a size range from 2 to 150 nm, but
is optimized for particles <20 nm. The Model 3086 1nm-DMA uses the
same basic design as the Nano DMA but with dimensions to provide a
1 to 50 nm size range and particularly good performance for <3 nm
particles. The basic design of these DMA’s is an extensive modification of
the Long DMA so that their performance is optimized for small particles. A
cross-sectional view of the Nano DMA is shown in Figure 1-4.
Figure 1-4
Cross Section of Model 3085A Nano DMA

TSI Instruments SMPS 3938 Specifications

General

Brand	TSI Instruments
Model	SMPS 3938
Category	Laboratory Equipment
Language	English