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 principle | Magnetic |
| Measurement range | 0 ... 360° |
| Accuracy | ± 1° |
| Resolution | 0.35° |
| 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 |
| Current Consumption @ 12 V DC | 1 mA (without heating) |
| Ambient temperature | -40 ... +70 °C |
| Connection | 7-pole plug |
| Material | Aluminum, stainless steel and plastic (Housing and wind vane) |
| Type of ball bearings | Metallic ball bearings |
| Weight | approx. 0.4 kg |
| Protection | IP 55 |
| Manufacturer | Thies |
| Sensor | Plug Pin No. | Ammonit Cable Wire Color* |
Meteo-40 Digital | Supply Sensor |
|---|---|---|---|---|
| Wind Direction Data | 3 | white | IN | |
| Clock | 4 | blue | CLK | |
| Supply | 1 | red | 12 V | |
| Ground | 2 | black | Main Ground | |
| Heating | 5 | orange, orange |
24 VAC/DC | |
| 6 | violet, violet |
Cable type without heating: LiYCY 4 x 0.25 mm²
Cable type with heating wires: LiYCY 8 x 0.25 mm²
Connect the shield logger-sided to Ground (GND)
