Product Overview 1-3
mode to a photometric mode where the total light scattered from
the particles is used to determine concentration based on
calibration.
The aerosol sample is drawn into the CPC inlet by an internal
vacuum pump. The inlet flow can be configured for either a 1.5
liters per minute (L/min) high-flow mode operation to improve
response time and minimize particle transport loss, or a 0.3 L/min
low-flow mode operation, used as part of an SMPS system. In high-
flow mode, 1.2 L/min of the inlet flow is diverted as a bypass flow.
In the low-flow mode, 1.2 L/min clean air enters as makeup air
through the back panel of the instrument. In both high- and low-
flow modes, 0.3 L/min aerosol flow passes through “sensor”
assembly, comprised of the saturator, condenser, and optics.
Instrument flows are controlled by a variable orifice and an orifice
operated at a critical pressure.
The Model 3775 CPC uses a laser-diode light source and diode
photodetector to collect scattered light from particles. An internal
microprocessor is used for instrument control and data processing.
A high resolution color LCD display presents real-time graphs of
number concentration, enables easy-to-use menus for control
operation functions and presents diagnostic information and
instrument status. A variety of communication options for
computer data acquisition and on-board data storage are available
using a removable flash memory card.
The instrument offers a critical flow pump for high accuracy
volumetric flows. It can also be used with an external vacuum
pump with the necessary internal plumbing modifications.
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