Ultrafine Condensation Particle Counter 3776
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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.
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/cm3. 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 (T95 <0.8 sec)
- Higher aerosol flow rate of 50 cm3/min for improved counting statistics
- Extended single particle counting up to 300,000 particles/cm3 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.