TSI Instruments 3080 Series User Manual

Control, Indicators, and Connectors 3–9
Impactor
An impactor may be mounted on the outside of the Electrostatic
Classifier (see Figure 2-5). The aerosol first enters an impactor,
which removes particles above a known particle size by inertial
impaction. For more information on impactor theory, see
Appendix B, “Impaction Theory and Operation
.”
Sheath Flow Controller
The sheath flow controller maintains a constant flow through the
sheath flow loop. The loop consists of a filter, pump (blower), filter,
heat exchanger, and flowmeter (see Figure 3-6). The flowmeter has
built-in temperature sensor and pressure sensor which are shown
separately in Figure 3-6. The flow is monitored by the
microprocessor and used to control the pump based on the desired
flow rate set from the front panel. The heat exchanger is used to
remove heat added to the flow loop by the pump. Readings from the
temperature and pressure sensors are used to update the particle
mobility and size displayed on the front panel display.
Bypass Flow Controller
The bypass flow controller maintains a constant flow through the
bypass flow path. The flow path consists of a filter, an orifice, and a
pump (blower). The pressure drop across the orifice is monitored to
control the pump and maintain a constant flow.
For both Model 3081 Long DMA and Model 3085 Nano DMA, the
bypass flow loop can be connected in series with the sheath flow
loop to provide higher sheath flow rate. The flowmeter in the sheath
flow controller loop is used for the feedback control of the total flow
rate when two blowers are connected in series.
Neutralizer
The neutralizer provides a known charge distribution on the aerosol
entering the DMA. The Classifier is made to accommodate a
Model 3077A/3077 Krypton-85 neutralizer without having to
remove the cabinet cover. For more information on the
neutralizer/charger, see “Charging Theory
” in Appendix B.
The Model 3077A is a default neutralizer for the Model 3080
Electrostatic Classifier. For aerosol at low concentrations, an
optional Model 3077 Krypton-85 neutralizer can be used to
neutralize the aerosol. The Model 3077 has exactly the same
dimensions as the Model 3077A so it fits in the neutralizer chamber
as well. The Model 3077 has five times less intensity (2 millicurie

TSI Instruments 3080 Series Specifications

General

Brand	TSI Instruments
Model	3080 Series
Category	Measuring Instruments
Language	English