Ultra-sonic type transmitter need not rotation-Part.
And Ultra-sonic is used navigation for the Polar regions.
Start of wind direction axis : Wind speed more than 0.1m/s
Power source: DC24V
Wind speed Range: 0-60m/s / Communication signal type RS422
Starting wind speed: 1.0m/s
Operation Temp Range: -35°C to +70°C
Installation position: Radar mast
