2-32 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
Notes: When used in the alternate configuration, the baseplate of the
Model 3086 1nm-DMA must be snapped into the classifier as in
Step 2 above or it will not be automatically recognized by the
Model 3082 classifier. Alternatively, the Model 3086 1nm-DMA can
be manually selected through Setup > Properties > Hardware >
DMA >3086 on the classifier front panel.
If the Model 3086 1nm-DMA is not automatically recognized when
the baseplate is snapped into the classifier, the classifier firmware
may need to be upgraded. See Upgrading Firmware in Chapter 6
for more information.
Using Nano DMA or 1nm-DMA Bypass Flow
The Nano DMA and 1nm-DMA are equipped with a bypass flow path which
allows the DMA to draw aerosol flow at a higher rate than the CPC in order
to minimize diffusion losses. Bypass flow configurations require external
equipment (vacuum source, flow regulation and control, etc.) which is not
provided with the purchase of an SMPS spectrometer.
The Nano DMA and 1nm-DMA are shipped with a plug on the bypass flow
port. To operate using bypass flow, you will need to remove the plug. Flow
can either be pulled out using a vacuum source or pushed out by
maintaining a positive aerosol inlet pressure. The DMA can be operated at
bypass flow rates of up to 20 L/min with the 3/8” inlet installed; however,
the Model 3088 and 3077(A) neutralizers often used with the SMPS
spectrometer have maximum flow rates of 5 L/min. The 1nm DMA has the
3/8” inlet installed by default; it is optional for the Nano DMA (see
Chapter 1, Nano DMA and 1nm-DMA for details). It is recommended that a
high efficiency filter be used downstream of the bypass flow port to avoid
human exposure to nanoparticles.
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