4-4 Model 3772/3771 Condensation Particle Counter
Concentration
Aerosol concentration
measured in [p/cc]
User Settings
Displays features available
for configuration
Data Logging, Water Removal, Totalizer Time,
Auto Fill, Analog Out, Data Averaging, and Drain.
Status
Displays operating
parameters and status of
CPC
Saturator Temperature, Condenser
Temperature, Optics Temperature, Cabinet
Temperature, Ambient Pressure, Orifice
Pressure, Nozzle Pressure, Laser Current, Liquid
Level, Analog Input 1, Analog Input 2, Flash
Status, USB status, Firmware Version
Total Count Mode
Accumulates particle counts
and clock time
Conce n t r ation
The CPC measures aerosol concentration in particles per cubic centimeter.
The 3772 displays a Concentration screen as shown in Figure 4-3. This is
the default display. Pressing ESC twice from any other screen returns
the display to Concentration screen. The LCD is updated once per second.
For both 3771 and 3772, concentration data can be accessed through
firmware communication using “RD” command. Refer to Chapter 7 and
Appendix B for more information on firmware commands. The maximum
concentration limit for the 3772/3771 is 10,000 particles/cm
3
.
When concentration exceeds 10,000 particles/cm
3
for a 3772, two
exclamation marks appear on the LCD main display, one in front of the
concentration value and one after. For both 3772 and 3771 CPCs,
measurements with concentrations that exceed 10,000 are flagged and the
status LED will be turned off.
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