AQ High Accuracy Wind Monitor

R. M. Young, 05305L, AQ High Accuracy Wind Monitor with 4-20 mA OutputsThe Wind Monitor-AQ is a high resolution wind sensor for air quality applications. It combines low threshold, fast response and excellent fidelity to meet important regulatory standards.U.S. Environmental Protection Agency Ambient Monitoring Guidelines for Prevention of Significant Deterioration (PSD).U.S. Nuclear Regulatory Agency NRC Regulatory Guide 1.23 Meteorological Programs in Support of Nuclear Power Plants. American Nuclear Society Standard for Determining Meteorological Information at Power Plants.Wind speed is sensed by a lightweight, carbon fiber thermoplastic (CFT), helicoid propeller. The wind direction sensor is a lightweight, balanced vane. The instrument body is UV stabilized plastic with stainless steel and anodized aluminum fittings. The instrument mounts on standard 1 inch pipe.The Wind Monitor measures horizontal wind speed and direction. Developed for air quality applications, it is accurate, sensitive, and corrosion resistant. The main housing, nose cone, propeller, and other internal parts are injection molded U.V. stabilized plastic. The tail section is lightweight expanded polystyrene. Both the propeller and vertical shafts use stainless steel precision grade ball bearings. Bearings have shields to help exclude contamination and moisture.Propeller rotation produces an AC sine wave signal with frequency proportional to wind speed. Internal circuitry converts the raw signal to 4 to 20 mA current output over specified wind speed range.Vane position is sensed by a 10K ohm precision conductive plastic potentiometer. This signal is also converted to 4 to 20mA output.The instrument mounts directly on a standard one inch pipe, outside diameter 34 mm (1.34'). An orientation ring is provided so the instrument can be removed for maintenance and re-installed without loss of wind direction reference. Both the sensor and the orientation ring are secured to the mounting pipe by stainless steel band clamps. Electrical connections are made in a junction box at the base.