1-10 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
Note: It is recommended that an impactor not be used with Bypass Flow
since the additional flow may result in an inaccurate aerosol flow
measurement and an incorrect impactor D
50
. See Installing an
Impactor in Chapter 2 for more information on acceptable impactor
flow rates.
DMA High Voltage Controller
An integral part of the classifier is the precise control of DMA voltage. This
is accomplished using a precision high-voltage supply with an external
feedback reference module. A negative supply is installed standard, and a
dual negative/positive supply is an optional factory installation. The DMA
controller provides an electrical potential on the center rod of the DMA. The
high voltage is set and monitored by the firmware.
The particle diameter can be set the same way that DMA voltage is set.
The corresponding voltage is calculated and set automatically. Note that a
sheath flow must be set before a particle diameter can be entered.
Particle Counter/Detector
When the classifier is operated in SMPS spectrometer mode, a CPC can
be attached downstream of the DMA to measure particle concentrations by
counting single particles. The CPC provides accurate particle
measurements at high and low concentrations at data rates of up to 50 Hz.
Figure 1-5
Model 3082 Electrostatic Classifier with Nano DMA and CPC
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