European Facility For Airborne Research

European Facility For Airborne Research July 25, 2024, 02:23

Instrument: two channel particle counter MetOne R4903 / MA20

Name two channel particle counter MetOne R4903 / MA20
Acronym MetOne-R4903
Manufacturer MetOne
Manufacturer website htt://
Operated by METAIR
Operated onboard

Instrument type

Name Optical Particle Counter (OPC)
Acronym Optical Particle Counter

Principle of operation

Measured parameter Aerosol size distribution
Operating principle

Instruments using aerosols optical properties to give the aerosols size distribution.

Measurement(s) Aerosol

Dimension and weight

External dimension
Weight 0.0


Operating mode In situ






Operational restriction

Operational requirements

Certification approvals

Additional information

Direct laser counting of aerosols larger than 0.3, and 0.5 micrometers (two channels).
Semi-quantitative characterisation of aerosol content in urban plume studies, or as an auxiliary parameter for meteorological research, because it is a very sensitive indicator for atmospheric layers.

Access, host and processing


Could also fit on any aircraft having the following characteristics

General description

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