A-1
APPENDIX A
Specifications
Table A-1 contains the operating specifications for the Model 3775
Condensation Particle Counter (CPC). These specifications are
subject to change without notice.
Table A-1
Model 3776 CPC Specifications
Particle size range
Min. detectable particle (D
50
).
Max. detectable particle ......
4.0 nm,
verified with DMA-classified sucrose particles
>3 μm
Particle concentration range
Single particle counting.......
Photometric ........................
0 to 50,000 particles/cm
3
with continuous live-time
coincidence correction
50,000 to 10,000,000 particles/cm
3
Particle concentration
accuracy ...............................
±10% at <50,000 particles/cm
3
±20% at < 10,000,000 particles/cm
3
Response time
High-flow mode ...................
Low-flow mode ....................
≅4 sec to 95% in response to concentration step change
≅5 sec to 95% in response to concentration step change
Flow rate
Aerosol flow ........................
Inlet, high-flow ...................
Inlet, low-flow ....................
Flow source...........................
Flow control ..........................
300 ± 15 cm
3
/min (0.3 ± 0.015 L/min)
1500 ± 50 cm
3
/min (1.5 ± 0.05 L/min)
300 ± 15 cm
3
/min (0.3 ± 0.015 L/min)
Internal high-vacuum diaphragm pump with brushless DC
motor (15,000 hours rated lifetime); option to use external
vacuum source (requires change to internal plumbing)
Volumetric flow control of aerosol flow by critical orifice,
differential pressure across orifice is monitored
Operating temperatures
Saturator ............................
Condenser ..........................
Optics .................................
39°C ±0.2°C
14°C ±0.2°C
40°C ±0.2°C
False background counts ......
<0.01 particle/cm
3
, based on 12-hr average; No false
counts incurred during butanol fill
Aerosol medium ....................
Recommended for use with air; safe for use with inert gases
such as nitrogen, argon, and helium (performance
specifications are for air)
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