3-4 Model 3936 Scanning Mobility Particle Sizer
TM
(SMPS
TM
) Spectrometer
4. On the front panel of the Classifier, set the control mode (lower-
left box on display) to “Analog Ctrl.”
5. Apply power to the CPC. For Model 3772, 3775, 3776, 3022A,
3025A CPCs, 3782, 3785, and 3786 WCPCs, ensure the
internal CPC pump is off and the green Pump LED on the front
panel is not lit.
6. Continue setting up the SMPS spectrometer by connecting the
CPC as described in the next section in this chapter.
Recommended Mode of Operation
Underpressure and Overpressure Modes
In the past, for the SMPS spectrometer using a Model 3071 or
3071A Classifier, the configuration of the flows and plumbing was
very dependent on whether the system was slightly underpressure
(flow being pulled through the DMA) or overpressure (flow being
pushed through the DMA). However, with the recirculating flow of
the Model 3080 series Classifiers, over/under pressure is much
less important for setup. The basic plumbing setup is the same for
both modes.
Typical Mode of Operation
The typical mode of operation for the SMPS spectrometer, as well as
the software defaults, is underpressure mode, using an impactor on
the inlet.
Plumbing Connections
Connecting the Model 3772 or 3010 CPC
Use the procedures in this subsection to connect a Model 3772 or
3010 CPC to the Classifier.
Model 3772 or 3010 with Nano DMA
Refer to Figure 3-1 and Figure 3-2 and the following instructions to
connect the plumbing between a Model 3080 Classifier with a
Model 3085 Nano DMA and a Model 3772 or 3010 CPC:
1. Connect the CPC vacuum connection (¼-inch tube connection
on back panel) to a vacuum source or pump (see the
Model 3772 or 3010 CPC manual for details).
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