B-6 Model 3936 Scanning Mobility Particle Sizer
TM
(SMPS
TM
) Spectrometer
The electric field causes positively charged particles to be attracted
through the sheath air to the negatively charged center rod. Particles
are precipitated along the length of the center rod (see Figure B-3 and
Figure B-4). The location of the precipitating particles depends on the
particle electrical mobility (Z
p
), the Classifier flow rate, and the
Classifier geometry. Particles with a high electrical mobility are
precipitated along the upper portion of the rod; particles with a low
electrical mobility are collected on the lower portion of the rod.
Particles within a narrow range of electrical mobility exit with the
monodisperse air flow (q
m) through a small slit located at the
bottom of the center rod. These particles are transferred to a
particle sensor to determine the particle concentration. The
remaining particles are removed from the Classifier via the excess
air flow (q
e
).
Figure B-4
Flow Schematic for the Electrostatic Classifier with Nano DMA
To Next Page
Loading...
Need help?
General
