The wind direction is detected by a low-inertia wind vane. The axis of the wind vane is running in ball bearings and carries a diametrically magnetized magnet at the inner end.
The angle position of the axis is canned contact-free by a magnetic angle sensor, (TMR = Tunnel Magneto Resistance) which gives two sinus- and cosinus-dependent voltages as output signal.
A connected micro-controller calculates from this voltages the wind direction in 1024 sectors (0.35°/sector). Related to sector 1 is the wind direction 0°-35°, sector 1024 corresponds to the wind direction 359.65°-360°.
|Characteristic||Description / Value|
|Measurement range||0 ... 360°|
|Starting threshold||< 1 m/s according to ASTM-Standards D5366-96
< 0.4 m/s according to VDI-Standard 3786 Part 2
|Output||10-bit serial-synchronous (compatible with Ammonit Meteo-40 data loggers)|
|Survival speed||max. 80 m/s, 30 min|
|Operating voltage||3.3 ... 30 VDC / 24 VAC|
|Operating voltage heating||24 V DC/AC, max. 20 W|
|Ambient temperature||-40 ... +70 °C|
|Material||Aluminum, stainless steel and plastic (Housing and wind vane)|
|Type of ball bearings||Metallic ball bearings|
|Weight||approx. 0.4 kg|