DMT - CCN-100 And CCN-200 - Cloud & Ice Nuclei - Cloud Condensation Nuclei Counter By Droplet Measurement Technologies (DMT) (2024)

One-of-a-kind measurements

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.

Responsive and versatile

Measure quickly changing conditions in airborne and ground-based applications with fast response, uninterrupted flow, and a multi-channel, optical particle counter.

Advanced supersaturation range

Get supersaturation as low as 0.07% and as high as 2%, plus complete automation of up to 250 programmable and scanned supersaturation settings.

Improved Accuracy

Minimize size and buoyancy effects with cylindrical geometry – giving you more accurate measurements for your critical research.

Onboard computer

Get real-time control, data display, and data logging with a user-friendly virtual instrument panel.

The CCN comes with a software program that enables the user to:

• Collect data
• Change supersaturation settings
• Adjust temperature and air flow settings
• Manipulate instrument pumps (e.g., turn air pumps on high to prevent condensation)
• Quickly detect any operational problems
• Update instrument calibration parameters
• Adjust the instrument to prepare it for shipping or re-humidify it after shipping

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%
• 20,000 particles/sec at supersaturations above 0.3%
• Measured Particle Size Range (from OPC, after supersaturation) : 0.75 – 10 µm
• Number of Particle Size Bins : 20
• 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 : 250
• 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
• Pump : 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
• Current :
• 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
• Weight :
• CCN-100:
• For lab use (with frame): 35.2 kg / 77.5 lb
• For aircraft use (without frame): 29.0 kg / 64.0 lb
• CCN-200:
• For lab use (with frame): 50 kg / 110 lb
• For aircraft use (without frame): 43.8 kg / 96.5 lb
• Environmental Operating Conditions :
• Temperature: 5 – 40°C (41 – 104 °F)
• RH: 0 – 100% RH non-condensing