The Model 911 Wind sensors use a proven 3 cup anemometer, and aerofoil vane & pointer reliability and environmental capability, with passive sensor elements for ultra low power consumption applications.

　　Special attention has been paid to the design of the shaft for greatest strength, the bearings for low friction and low threshold, the balance of the moving parts for high wind speed withstand and the sealing system between the moving parts and the fixed body, for environmental integrity. The sensors have been calibrated by a NATA laboratory and type tested up to 150km/hr for verification of strength and balance. The sensor is easily mounted on most standard examples of cross arm.