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Condensation Particle Counter 3775

Recommended Replacement


This product has been discontinued as of March 31, 2018. Click here to see its replacement: Condensation Particle Counter 3752

Condensation Particle Counter 3775 is a general-purpose counter that detects airborne particles down to 4 nm. It provides highly accurate measurements over a wide concentration range from 0 to 10 7 particles/cm 3 . As a result, this CPC is quite versatile and well-suited for a broad range of applications.

Product Details

The successor to the Model 3022A, the Model 3775 features extended single particle counting with continuous, live-time coincidence correction for concentrations up to 50,000 particles/cm 3 . A photometric mode takes over at higher concentrations. The 3775 also features an improved transition between the two count modes. It has a color VGA display, anti-spill design, water-removal capability, data logging and storage capabilities with a removable memory card, and USB and Ethernet ports. It includes built-in SMPS™ compatibility and our Aerosol Instrument Manager® software.

Features and Benefits

  • Lower particle detection size limit of 4 nm
  • Fast response to rapid changes in aerosol concentration (T 95@ 4 sec)
  • Extended single particle counting up to 5 x 10 4 particles/cm 3 with continuous, live-time coincidence correction
  • Smooth transition to photometric mode counting that goes up to 10 7 particles/cm 3
  • Butanol-friendly features, including anti-spill design, water-removal system, butanol odor absorber, and improved resistance to optics flooding after tilt of instrument or inlet flow restriction
  • Built-in data logging and storage capability with removable memory card
  • USB and Ethernet available
  • Built-in SMPS compatibility (Now standard!)
  • Auto recovery from power failure
  • Removable saturator wick for easy transport and maintenance
  • Particle concentration, plots of concentration versus time, total counts, or instrument status shown on front-panel color LCD display


  • Basic aerosol research
  • Filter and air cleaner tests
  • Combustion and engine exhaust research
  • Health effects studies
  • Inhalation and exposure studies
  • Atmospheric and climate studies
  • Nanotechnology research

  • Can the CPC be operated with different carrier gases?
    Yes, but only inert gases.
  • Is the counting efficiency for each CPC determined individually?
    No. The CPC efficiency curve has been determined by testing a statistically valid number of CPCs and averaging the results to obtain the curve published in the product literature. Variation between units is very small. 
  • What is the final droplet size after growth by condensation?
    This question has been investigated, theoretically, by Ahn and Liu (1990). For the initial particle diameters of 5 and 20 nm, the computation results show a final droplet size of 11.3 and 12.3 micrometers, respectively (Ahn and Liu, 1990). Similar experimental results have also been determined.

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