Heavy Duty Wind MonitorThe Wind Monitor-HD has important features that greatly extend the service life of this popular sensor. It promises improved survivability for the most severe wind measuring applications.The reliability of the wind monitor sensor is well known. The sensitive vane and propeller combination has proven effective for countless applications in many disciplines.The Wind Monitor-HD (Heavy Duty) model is designed to address the most common concerns of mechanical wind speed and direction sensors: bearing replacement. The HD utilizes extremely long-wearing, oversize ceramic bearings to increase service life of standard stainless steel bearings. In addition to being more wear resistant, ceramic is resistant to corrosion in the most hostile environments.The Wind Monitor-HD also has an oversized propeller shaft , high pitch propeller, and a locking propeller nut. The main housing, nose cone, propeller, and other internal parts are injection molded U.V. Stabilized plastic. Both the propeller and vertical shafts use ceramic ball bearings. Bearings have light contacting teflon seals and are filled with a low torque wide temperature range grease to help exclude contamination and moisture.Propeller rotation produces an AC sine wave signal with frequency proportional to wind speed. This AC signal is induced in a stationary coil by a six pole magnet mounted on the propeller shaft. Three complete sine wave cycles are produced for each propeller revolution.Vane position is transmitted by a 10K ohm precision conductive plastic potentiometer which requires a regulated excitation voltage. With a constant voltage applied to the potentiometer, the output signal is an analog voltage directly proportional to azimuth angle.The instrument mounts on standard one inch pipe, outside diameter 34 mm (1.34'). An orientation ring is provided so the instrument can be removed for maintenance and reinstalled without loss of wind direction reference. Both mounting post assembly and orientation ring are secured to the mounting pipe by stainless steel band clamps. A 3 meter (9.8 ft) pigtail cable assembly is supplied for electrical connections. For longer cable lengths a user supplied junction box or connector may be used. A variety of devices are available for signal conditioning, display, and recording of wind speed and direction.