UVW ANEMOMETER W/08254 PROPS

The 27005T 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.

Ships in 1-3 weeks.

Features

08274 Expanded Polystyrene Propeller (EPS):

Diameter: 22 cm

Pitch: 29.4 cm wind passage per revolution

Range: 0-25 m/s (55 mph)

Threshold:* 0.3 m/s (0.6 mph)

Distance constant:* 1.0 m (3.2 ft)

08254 Carbon Fiber Thermoplastic Propeller (CFT):

Diameter: 20 cm

Pitch: 30.0 cm wind passage per revolution

Range: 0-35 m/s (80 mph)

Threshold:* 0.4 m/s (0.8 mph)

Distance constant:* 2.1 m (6.9 ft)

Signal Output:

Standard tach-generator transducer: Analog DC voltage proportional to wind component. Polarity indicates rotation direction. 1800 RPM (500 mV) = 8.8 m/s (19.7 mph).

Optional photochopper transducer: Voltage pulse with frequency proportional to wind component. 10 pulses per revolution. 1800 RPM (300 Hz) = 8.8 m/s (19.7 mph)

Power Requirement:

24 Vac/12 W for blower motor in UVW Anemometer (separate 115/230V transformer supplied). Propeller Anemometer with tach-generator is self-powered. Optional photochopper transducer requires 5-15 Vdc at 11 mA.

Dimensions:

UVW Anemometer: overall height 107 cm (42″), each sensor projects 41 cm (16″), base diameter 16 cm (6.2″), mounting 34 mm (1.34″) diameter (standard 1″ pipe).

Propeller Anemometer: Overall length with mounting 43 cm (17″), housing diameter 2.5 cm (1″), mounts on standard 3/4″ pipe.

Weight:

UVW Anemometer: 3.6 kg (7.9 lbs), shipping weight 8.2 kg (18 lbs)

Propeller Anemometer: 0.5 kg (1.2 lbs)

*Nominal values determined in accordance with ASTM standard procedures.

Ordering Information:

27005 UVW Anemometer with 08274 EPS Propellers, less cable

add suffix “T” for optional 08254 CFT Propellers

add suffix “J” for optional 12 Vdc Blower

27106 Propeller Anemometer with 08274 EPS Propeller, standard tach-generator transducer, less cable

add suffix “D” for optional single-direction photochopper

add suffix “F” for optional two-direction photochopper, specify 3, 6, or 15 pulses per revolution

add suffix “T” for optional 08254 CFT Propellers

08724 EPS Propeller, 22 cm diameter

08254 CFT Propeller, 20 cm diameter

330-0820 Signal Cable, per foot

Order Sensor Cable Model 18660 (below) by the foot.