Wind Speed and Direction Instrument

The 6533 Wind speed and direction instrument is a high-performance RM young sensor. It combines simplicity and lightweight corrosion-resistant construction with a low threshold, fast response, and excellent fidelity.

The wind speed sensor is a four-blade helicoid propeller. Propeller rotation produces a sinewave voltage output where the frequency is directly proportional to wind speed. Slip rings and brushes are not used.

The wind direction sensor is a lightweight vane with sufficiently high damping ratio and low aspect ratio to ensure excellent fidelity in rapidly fluctuating winds. Vane position is sensed by a precision conductive plastic potentiometer. With a known excitation voltage applied to the potentiometer, the output signal is directly proportional to azimuth.

The instrument is made of UV stabilised plastic with stainless steel and anodised aluminium fittings. All bearings are precision grade stainless steel. A Unidata’s micro-power interface circuit, housed in a junction box on the mounting post, converts the sinewave to a 5V signal and potentiometer output to a calibrated 2.50 V signal, suitable for connection to the regular data logger.
An 8 core cable can be used to connect the instrument to the logger. The instrument mounts on standard 1 inch pipe.