TSI Instruments 3082, Operation And Service Manual, Page: 27 / 225

Product Overview 1-7
Long DMA
The Model 3081A Long DMA provides a size range of 10 to 1000 nm. A
cross-sectional view of the Long DMA is shown in Figure 1-3. The mobility
analyzer consists of two cylindrical electrodes made of polished stainless
steel and insulated from each other by a Teflon
®
spacer at the top and an
acetyl-plastic (Black Delrin
®
) spacer at the bottom. The lower spacer allows
enough high-voltage leakage to prevent static charge build up near the
exit slit.
Figure 1-3
Cross Section of Model 3081A Long DMA
®Teflon®, Delrin®, and Dacron® are registered trademarks of E. I. du Pont de Nemours and Company.