European Facility For Airborne Research

European Facility For Airborne Research June 28, 2022, 23:39

Instrument: DMT dual-channel Cloud Condensation Nuclei Counter

Name DMT dual-channel Cloud Condensation Nuclei Counter
Acronym CCN-Counter
Manufacturer Droplet measurement technologies
Manufacturer website
Operated by FAAM
Operated onboard

Instrument type

Name Condensation Particle Counter (CPC)
Acronym Condensation Particle Counter

Principle of operation

Measured parameter Number concentration of submicrometer aerosol particles
Operating principle

The particles are detected and counted by a simple optical detector after a supersaturation vapor (butanol or water) condenses onto the particles, causing them to grow into larger droplets. The CPC uses a (laser diode) light source, a condensing lense, an internal microprocessor control, volumetric flow control and a front panel display.
or Pollak counter

Measurement(s) Clouds & Precipitation

Dimension and weight

External dimension Internally mounted on 19 inch racks. 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 43.8


Operating mode In situ






Operational restriction

Samples not to be taken in cloud or heavyvy precipitation.

Operational requirements

Intake via Rosemount housing intake.

20A at 28VDC

Certification approvals

Certified for FAAM Bae146

Additional information

Continuous-flow thermal diffusion chamber. Activation of CCN particles at constant supersaturation maintained in a 50-cm-high column with continuously wetted walls and a longitudinal thermal gradient; sizing of the activated droplets using an optical particle counter

Access, host and processing


Available from Met Office.
Can be flown as standard on all sorties if requested from Met Office.

Could also fit on any aircraft having the following characteristics

General description

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