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Ultrafine Condensation Particle Counter 3776

Recommended Replacement


This product has been discontinued as of March 31, 2018. Click here to see its replacement: Condensation Particle Counter 3756

The Ultrafine Condensation Particle Counter 3776 (UCPC), a types of condensation particle counter (CPC) is designed primarily for researchers interested in airborne particles smaller than 20 nm. It is a continuous-flow instrument that detects particles down to 2.5 nm. It uses a special sheath-air flow design that improves response to changes in particle concentration and increases counting efficiency for ultrafine particles.

Product Details

The successor to our Model 3025A, the 3776 has a higher aerosol flow rate and better flow control. It features extended single particle counting with a continuous, live-time coincidence correction up to 300,000 particles/cm 3 . It has a butanol-friendly, anti-spill design with water-removal capability. It includes a color display, built-in data logging and storage capabilities with a removable memory card, and USB and Ethernet connectors. It comes SMPS™-ready, right from the factory, and it includes our Aerosol Instrument Manager® software.

Features and Benefits

  • Lower particle detection size limit of 2.5 nm
  • Fast response to rapid changes in aerosol concentration (T 95 <0.8 sec)
  • Higher aerosol flow rate of 50 cm 3 /min for improved counting statistics
  • Extended single particle counting up to 300,000 particles/cm 3 with continuous, live-time coincidence correction for maximum accuracy
  • 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


  • Atmospheric and climate research
  • Particle formation and growth studies
  • Combustion and engine exhaust research
  • Nanotechnology research

  • Can the CPC be operated with different carrier gases?
    Yes, but only inert gases.
  • How do you test the UCPC counting efficiency down to 3-nm diameter particles?
    Sodium chloride or silver particles in the range from 2 to 300 nm are generated using an ultrafine condensation-type aerosol generator described by Scheibel and Porstendorfer (1983) and more recently by Kesten, Reineking, and Porstendörfer (1991). The particles are size-classified with a modified Electrostatic Classifier and their concentration measured with an Electrometer. The UCPC concentration measurement is compared to the Electrometer.
  • 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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