Unpacking and Setting Up 2-33
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
. For more on
acceptable impactor flow rates see Installing an Impactor in
Chapter 2.
Connecting the DMA to the High Voltage Port
Each DMA has a cable and connector designed to connect to the high-
voltage port on the classifier.
W A R N I N G
Do not pull or tug on the high-voltage cable. Always grip the plug to
disconnect the cable.
Do not use the cable to carry or move the instrument; if the cable
breaks, you could be exposed to a high voltage.
Replace a cut or damaged cable immediately.
Always switch off the instrument before connecting or
disconnecting the high-voltage connector.
To connect a Long DMA, Nano DMA or 1nm-DMA to the high-voltage
supply, follow these instructions:
1. Check that the power is turned off.
2. Insert the high-voltage connector into the high-voltage port.
Note: The connector only fits in one orientation; one side of the
connector is flattened. Align the flattened side of the connector
with the flattened side of the port.
Installing the Flow Equalizer Assembly
Use the flow equalizer assembly to introduce clean dilution air for
applications where the DMA is run at a lower flow rate than the CPC. See
Chapter 1, Flow Equalizer Assembly for details. A flow equalizer assembly
is shipped standard with purchase of a 3938 SMPS system.
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