European Facility For Airborne Research

European Facility For Airborne Research May 29, 2023, 20:28

Instrument: Water Vapour Sensing System

Name Water Vapour Sensing System
Acronym WVSS-II
Manufacturer SpectraSensors Inc.
Manufacturer website
Operated by METOFFICE
Operated onboard

Instrument type

Name Non dew/frost point hygrometer
Acronym Other hygrometer

Principle of operation

Measured parameter Water Vapour, Relative Humidity
Operating principle

The MOZAIC-Humidity Device (MHD) is a special airborne humidity sensing device (AD-FS2), developed by Aerodata (Braunschweig, Germany) and based on the humidity and temperature transmitter HMP230 of Vaisala (Helsinkin, Finnland). The sensing element itself is a combination of a capacitive relative humidity sensor (Humicap-H, Vaisala) and a Pt100 temperature sensor which has been installed in a Rosemount housing mounted on the outside skin of the aircraft in the vicinity of the nose cone.

Measurement(s) Thermodynamics

Dimension and weight

External dimension Internally-mounted sensor unit 254.00mm (10.00”) long x 138.18mm (5.44”) wide x 92.08mm (3.625”) high.
Weight 3.46


Operating mode In situ






Operational restriction

approximately 0-45,000ft altitude

+50 to -65C external temperature

Operational requirements

5 amp maximum @ 28 VDC

Certification approvals

Certified for window-blank installation on FAAM aircraft

Additional information

Access, host and processing


Optional instrument fit on the FAAM aircraft

Could also fit on any aircraft having the following characteristics

General description

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