Instrument Description 3-11
Total Count Mode (3772 only)
Total Count Mode (also called totalizer mode) counts number of particles in
a given time period. This mode is used to improve counting resolution at
very low particle concentrations. Time and number of counts are shown on
the front panel display of the 3772.
Water Removal
When the aerosol sample has a dew point above the condenser
temperature of 22°C, water vapor may condense on the walls of the
condenser and run back into the saturator, contaminating the butanol over
time. Unlike its predecessor, the Model 3010, 3760A, or 3762 CPC, the
Model 3772/3771 CPC is able to capture condensed water vapor and
remove it, significantly reducing butanol contamination in high humidity
environment. The water removal process increases the butanol
consumption. For additional information refer to Chapter 4.
Internal Data Logging (3772 only)
A removable Flash Memory Card can be inserted in the slot on the 3772
front panel to store data including particle concentration and analog input
data. Data can then be transferred to a computer for further data
processing. Refer to Chapter 4 for more details. It is not recommended you
use a Flash Memory Card and Aerosol Instrument Manager
®
software or
terminal program to collect data simultaneously to avoid data transfer
interference.
Remote Access of Instrument
The Model 3772/3771 CPC provides an Ethernet port to connect the
instrument to a network for monitoring status information. Status
information includes saturator, condenser, optics temperatures, laser
power, and particle concentration, etc. The data is updated once every five
seconds. Refer to Chapter 7 for more details.
External Vacuum Pump or Source
The external vacuum pump or source must provide sufficient vacuum to
maintain a critical pressure across the critical orifice, while providing an
aerosol flow of 1.0 L/min. At an atmospheric pressure of 100 kPa (1 atm),
an external pump or other vacuum source must provide at least 60 kPa
(18 in. Hg) of vacuum and 1.0 L/min inlet volumetric flow for each CPC
supported. TSI offers Model 3032 Vacuum Pump for one CPC and Model
3033 Vacuum Pump for multiple CPCs. Contact TSI technical support for
more information on use of an external vacuum pump.
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