3–10 Series 3080 Electrostatic Classifiers
instead of 10 millicurie) as that of the 3077A so it is sufficient
enough to achieve charge equilibrium for low concentration
aerosols for example ambient aerosols.
High-Voltage Controller
The High-Voltage controller provides a charge on the center rod of
the DMA. This high voltage is controlled by the microprocessor
based on the desired setting from the front panel and monitored by
a sensitive high-voltage divider. The default High Voltage controller
is with negative polarity so positive particles are selected by the
DMA. An optional positive polarity High Voltage controller is
available through TSI (part number 1030354) for selecting negative
particles. Refer to Chapter 6, “Replace Negative High-Voltage
Controller with Positive High-Voltage Controller,” for details.
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