European Facility For Airborne Research

European Facility For Airborne Research July 25, 2024, 02:06

Instrument: NOxTOy

Name NOxTOy
Acronym NOxTOy
Manufacturer MetAir, in co-operation with PSI
Manufacturer website
Operated by METAIR
Operated onboard

Instrument type

Name Trace Gas Analyzer
Acronym Trace Gas Analyzer

Principle of operation

Measured parameter Trace Gas concentrations
Operating principle

Measurement(s) Gas Phase

Dimension and weight

External dimension
Weight 9.0


Operating mode In situ






self developed

Operational restriction

no real restrictions, but, the instrument is more suitable for measurements in the boundary layer (mixed layer, with NO2-concentrations >2 ppb) than in background concentrations in the Free Troposphere.

Operational requirements

28 VDC, 90 VA

Certification approvals

presently only operational in MetAir's DIMO. Other similar instruments are in service at MeteoFrance, and in the DO-128 of TU-Braunschweig. Status of certification there is unknown.

Additional information

The calibration is done by injecting NO2 from a permeation source (or from a 10 ppm cylinder) via a capillary in a variable air flow. The NO2 concentration can be referenced to O3 by using the Ox-channel. Therefore, NO2 losses in the system and other uncertainties are cancelled.

Access, host and processing


Yes, in principle. But, the user has to be skilled, trained, and has to perform the certification for his/her use.

Could also fit on any aircraft having the following characteristics

General description

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