APPENDIX A
Specifications
A-1
Model 3786 Ultrafine Water-based Condensation Particle Counter
(UWCPC) specifications are as follows (specifications are subject to
change):
Particle Size Range
Minimum detectable particle (D
50
)
Maximum detectable particle
2.5 nm (wettable aerosols)
>3 micrometers
Particle Concentration
Single particle counting (live-time corrected)
0 to 1 × 10
5
particles/cm
3
Particle Concentration Accuracy
±12% at <10
5
particles/cm
3
(does not include
error due to counting statistics)
False Background Counts
<0.001 particle/cm
3
one-hour average
Response Time
<2 seconds for 95% response to
concentration step change
Aerosol Medium
Use with air only 10°C to 35°C
Light Source
3 mw 655 nm laser diode
Flow
Aerosol flow rate
Sheath flow rate
Inlet flow rate
Flow control
Flow source
Absolute Pressure Operating Range
Inlet Pressure (Gauge)
0.3 L/min (nominal)
0.3 ± 0.03 L/min
0.6 ± 0.03 L/min
Two internal pumps controlled to calibrated
pressure drop across orifice with inlet
pressure correction.
Two internal diaphragm pumps
50 to 110 kPa (0.5 to 1.1 atm)
±2.5 kPa (±10 in. of water)
Condensing Liquid
Filling system
Water (distilled water recommended)
Internal liquid injection valve, with water
recycling capability. Source water container
located externally.
Optional Auxiliary Single-Board-
Computer (SBC)
An internally mounted PC/104 SBC provides
externally available Serial and Ethernet ports
and internal serial connection to UWCPC.
The SBC is provided with Linux OS, Web
server, FTP and Telnet services.
Communications
UWCPC control and data can be accessed
digitally directly using USB or Serial
interfaces. Serial and Ethernet interfaces are
available to the internal SBC which has an
internal serial interface to the UWCPC.
Analog Output
0-10 volt controlled via communications from
PC/104 or serial interface.
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