WIND MONITOR/ANEMOMETER Manufactured By: R.M. Young
Originally developed for ocean data buoy use, the wind monitor is well suited for a wide variety of wind measuring applications. Simplicity and lightweight corrosion resistant construction were principal design considerations. Slip rings and brushes have been eliminated resulting in improved reliability with lower cost. Extensive use of modern thermoplastic materials improves resistance to corrosion from the sea air environment and atmospheric pollutants. The wind speed sensor is an injection molded helicoid shape propeller. The propeller is four blade, 18 cm diameter x 30 cm pitch with a distance constant of 3.3 m (10 ft). Wind speed threshold is 1.0 m/s (2.2 mph). Propeller rotation produces an AC sine wave voltage signal with frequency directly proportional to wind speed. The AC voltage signal is induced in a centrally mounted coil by a six pole magnet mounted on the propeller shaft. The coil is located on the non-rotating central portion of the main mounting assembly, eliminating the need for slip rings and brushes. Vane position is transmitted to a precision conductive plastic potentiometer which is located in a sealed chamber just below the wind speed transducer coil. The potentiometer requires a regulated excitation voltage with a constant voltage applied to the potentiometer element, the output signal is an analog voltage directly proportional to azimuth angle. All transducer leads terminate in a junction box on the mounting post for convenience in making sensor cable connections. Five conductors are required. Construction is principally of rigid U.V. stabilized thermoplastic with stainless steel and anodized aluminum fittings. Propeller and vertical shaft bearings are stainless steel, precision-grade ball bearings.
Specifications
Direction     Range: 360° mechanical <355° electrical     Accuracy: 2 degrees     Survival: 100 m/s (220 mph)     Threshold: 0.9 mph     Delay Distance: 1.3 m (4.3 ft)     Signal Output: Analog DC voltage from a precision low-torque                           condutive plastic potentiometer     Power: Regulated reference voltage for 10K potentiometer     Physical Height Overall: 37 cm (14.6 in)     Length Overall: 55 cm includes vane & prop (21.7 in)     Prop Diameter: 18 cm (7.1 in)     Weight: 1.0 kg (2.2 lbs)	Speed     Range: 0 to 50 mph (0-125 Knots)     Survival: 100 m/s (220 mph)     Threshold: 1.0 m/s (2.2 mph) 2.0 Knots with select bearings     Distance Constant: 2.7 m (8.9 ft)     Signal Output: sine wave - 90 Hz/8.8 m/s     Resolution: 0.1 mph     Accuracy: 0.25 mph