Cloud Condensation Nuclei (CCN) counter
Cloud Condensation Nuclei (CCN) counter

Cloud Condensation Nuclei (CCN) counter

Droplet's CCN-100/200 measures the count and size of individual aerosol particles that can form into cloud droplets. Its fast response time allows use in either airborne or ground-based stations.

Enable climate models and accurate predictions of climate change with the CCN-100/200 – the only instrument of its kind to measure CCN concentrations in space and time.
Measure quickly changing conditions in airborne and ground-based applications with fast response, uninterrupted flow, and a multi-channel, optical particle counter.
Get supersaturation as low as 0.07% and as high as 2%, plus complete automation of up to 250 programmable and scanned supersaturation settings.
Minimize size and buoyancy effects with cylindrical geometry – giving you more accurate measurements for your critical research.
Get real-time control, data display, and data logging with a user-friendly virtual instrument panel.


Supersaturation generation and particle light-scattering

  • A continuous-flow thermal-gradient diffusion chamber measures aerosols that can act as cloud condensation nuclei.
  • Inside the chamber, a thermodynamically unstable, supersaturated water vapor condition is created by taking advantage of the difference in diffusion rates between water vapor and heat.
  • The supersaturated water vapor condenses on the cloud condensation nuclei in the sample air to form droplets, which are counted and sized.




Aerosol Medium

Air, 5 - 40 °C (41 - 104°F)

Number Concentration Range

Depends on supersaturation:

  • 6,000 particles/sec at supersaturations below 0.2%
  • 2,000 particles/sec at supersaturations above 0.3%

Measured Particle Size Range (from OPC, after supersaturation)

0.75 – 10 µm

Number of Particle Size Bins


Sampling Frequency

1 Hz / 1 Second

Supersaturation Range

0.07% - 2.0%

Time Required for Supersaturation Change

~30 seconds for 0.2% change

Maximum Number of Automatically Scanned Supersaturation Settings


Optical Particle Counter Laser

660 nm, 35 mW

Flow Range

  • Total flow: 200 – 1000 vol. cc/min (factory calibrated at 500 Vccm)
  • Sample flow: 20 – 100 Vccm
  • Sheath flow: 180 – 900 Vccm

Flow Control

  • Total flow is adjustable from within CCN Counter software
  • Sample/Sheath flow ratio is adjustable using manual metering valve


  • Solenoid pumps for water; diaphragm pump for air

Side Panel Connections

  • System power switch
  • LED for overall system power
  • Watchdog light
  • Air vents
  • Inlet and exhaust valves
  • 28 VDC pin connector
  • Ethernet connection
  • USB connection
  • Mouse and keyboard connections
  • Touchscreen connection
  • Video connection
  • Serial data port
  • LED power connection

Computer System

  • On-board Intel® Celeron® 1 GHz processor
  • 512 MB RAM
  • 80 GB hard drive for data storage
  • User interface via standard keyboard and monitor (included)

Data System Interface

RS-232, 9.6 Kb/sec Baud Rate (single CCN Counter) or 57.6 Kb/sec (Dual CCN Counter)

Features for Easy Aircraft Mounting

  • Rack-mount compatible
  • Center of gravity located 15.5” from bottom of back base plate
  • Instrument plumbing system sealed for operation on pressurized aircraft

Power Requirements

28 VDC


CCN-100: 15 A at startup, nominal 7 A during regular operation
CCN-200: 25 A at startup, nominal 20 A during regular operation

Size (for both CCN-100 and 200)

For lab use (with frame):

  • 35.0” H x 19.3” W x 15.6” D /
  • 88.9 cm H x 48.9 cm W x 39.7 cm D

For aircraft use (without frame):

  • 32.0”H x 15.25” W x 10.6 D /
  • 81.3 cm H x 38.7 cm W x 27 cm D



  • For lab use (with frame): 35.2 kg / 77.5 lb
  • For aircraft use (without frame): 29.0 kg / 64.0 lb


  • For lab use (with frame): 50 kg / 110 lb
  • For aircraft use (without frame): 43.8 kg / 96.5 lb

Environmental Operating Conditions

Temperature: – 40°C (41 – 104 °F)
RH: 0 – 100% RH non-condensing

Get more info:

Contact the Envicontrol team

Droplet CCN datasheet

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