WEATHER STATION The RM Young 05501 Wind Monitor-IS can safely be used in Class 1, Division 1, Group A,B,C,D hazardous areas.  The wind speed sensor is a four blade propeller. The propeller drives a reliable, non-contacting magnet/coil transducer; slip rings and brushes are not used.  The wind direction sensor is a durable molded vane. Vane angle is sensed by a precision, long-life potentiometer housed in a sealed chamber.  Internal circuitry converts signals for wind speed and wind direction into separate, 4 to 20 mA current outputs. This configuration is especially suited for long cable runs or for industrial settings where noise immunity is important.  The instrument is constructed of UV stabilized plastic with stainless steel and anodized aluminum fittings. Precision grade, stainless steel ball bearings are used. Circuitry and cable terminations are in a convenient junction box on the instrument base.  The instrument installs on standard 1 inch pipe. A mounting orientation ring assures correct alignment of the wind direction reference when the instrument is removed for maintenance. Features : Wind speed sensor is a four blade helicoid propeller Wind direction sensor is a durable molded vane Corrosion resistant construction protects the sensor from harsh environments. Specifications : Range: Wind speed: 0-60 m/s (134 mph) Gust survival: 100 rn/s (220 mph) Azimuth: 360° mechanical, 355° electrical (5° open) Accuracy:  Wind speed: ±0.3 rn/s (0.6 mph) or ± 1%; Wind direction: ±3 degrees Threshold: Propeller: 1.0 m/s (2.2 mph);  Vane: 1.1 m/s (2.4 mph) Dynamic Response: Propeller distance constant (63% recovery) 2.7 m (8.9 ft);  Vane delay distance (50% recovery) 1.3 m (4.3 ft); Damping ratio: 0.3;  Damped natural wavelength: 7.4 m (24.3 ft);  Undamped natural wavelength: 7.2 m (23.6 ft) Signal Output: WS: 4 to 20 mA for 0 to 50 m/s (0 to 100 m/s optional);  WD: 4 to 20 mA for 0 to 360 degrees azimuth Power Requirement: 8-30 VDC (40 mA max.) Dimensions: Overall height: 37 cm (14.6 in);  Overall length: 55 cm (21.7 in);  Propeller: 18 cm (7 in) diameter Mounting: 34 mm (1.34 in) diameter (standard 1 inch pipe) Weight:  Sensor weight: 1.0 kg (2.2 lbs); Shipping weight: 2.3 kg (5 Ibs).