The Fairmount Windvane is a professional sensor intended to provide reliable and accurate measurement of wind speed and direction, combining traditional British quality with modern electronics. It has been developed to offer very smooth and reliable mechanical operation with minimum maintenance.
The Windvane incorporates technology using a giant magneto resistive (GMR) sensor to offer accurate and frictionless sensing. It has an electrical output proportional to the direction of the wind. The output, with no deadband at north, is also suitable for feeding monitoring systems such as the Fairmount NOMAD, EMS3800 Automatic Weather Stations or Intellisense.
In addition, an NMEA serial output can be made available from the Windvane containing both wind direction and wind speed information updated four times per second. When used with the Sensor Interface module, reliable long distance communications can be provided.
Transducer type: GMR solid state system with microcontroller
Maximum wind speed: 75 m/s Resolution: 1o
Aligning threshold: <0.8 m/s for a 10o offset
Damping ratio: 0.25
Distance constant: Typically 3.0 m
Undamped natural wavelength: 2.2 m
Repeatability; 0.5% FSD
Electrical angle: 0 to 359o no deadband at North
Nominal output signal: 0 to 1.8 V DC for 0 to 359o representing a 1 s rolling average updated 5 times per second
NMEA serial output: When anemometer is connected, 0 to 5 V level data containing both direction and speed information updated 4 times per second
Supply voltage: 6 to 28 V DC
Power consumption: 3 mA Stabilisation time: <1 s from power up
Operating temperature: -20 to +70oC
Heater option: 24 V DC / AC, 100 Ω 6 W