1-2 Model 3775 Condensation Particle Counter
Particle concentration, plots of concentration versus time, total
counts, instrument status, and user settings shown on front-
panel color LCD display
Figure 1-1
Model 3775 Condensation Particle Counter
How it Works
In the Model 3775 Condensation Particle Counter (CPC), an aerosol
sample is drawn continuously through a heated saturator where
butanol is vaporized and diffuses into the aerosol sample stream.
Together, the aerosol sample and butanol vapor pass into a cooled
condenser where the butanol vapor becomes supersaturated and
ready to condense. Particles present in the sample stream serve as
condensation nuclei. Once condensation begins, particles quickly
grow into larger droplets and pass through an optical detector
where they are counted easily. At low concentrations, the optical
detector counts individual pulses produced as each particle
(droplet) passes through the sensing zone. For very high particle
concentrations, the Model 3775 transitions from the single count
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