The 27005 Gill UVW Anemometer measures the three orthogonal vectors of the wind, along wind component “U”, across wind component “V”, and vertical wind component “W”. The three propeller anemometer sensors are mounted at right angles on a common mast. Each sensor measures the wind component parallel with its axis of rotation. Propeller response as a function of wind angle approximates the cosine law, allowing true wind velocity and direction to be calculated.
The UVW Anemometer is designed for maximum sensitivity at lower wind speeds. Optional carbon fiber thermoplastic (CFT) propellers are available for applications requiring greater range and durability. Rain and dust are excluded from the precision bearings by a continuous duty air blower that keeps the instrument under a slight positive pressure.
The propeller anemometer is a precision air speed measuring instrument. The four blade helicoid propeller drives a miniature tach-generator. Output voltage is directly proportional to the axial component of the wind speed. Signal polarity indicates direction of propeller rotation. The propeller anemometer is also available with single or dual direction photochopper transducer. The propeller anemometer is especially suited for measuring the vertical wind component. Since normal wind direction seldom exceeds ± 30° from horizontal, propeller response can be calibrated to follow the cosine law within 3% over this range.
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