03002-L

Specifications and Technical Data

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Good all purpose wind set

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Technical Description

The 03002 uses a cup wheel assembly to measure wind speed. Rotation of the cup wheel produces an ac sine wave that is directly proportional to wind speed. The frequency of the ac signal is measured by a datalogger pulse count channel, then converted to engineering units (mph, m/s, knots). Campbell Scientific’s version uses shielded bearings, which lowers the anemometer’s threshold.

Wind direction is sensed by a potentiometer. With the precision excitation voltage from the datalogger applied to the potentiometer element, the output signal is an analog voltage that is directly proportional to the azimuth angle of the wind direction.

03002-L Specifications

Operating Temperature: -50° to +50°C; assuming non-riming conditions
Overall Height: 32 cm (12.6 in.)
Crossarm Length: 40 cm (15.7 in.) between instruments (center-to-center)
Mounting Diameter: 34 mm (1.34 in.); mounts on standard 1-in. IPS pipe

Wind Speed (Anemometer)

Range: 0 to 50 m/s (112 mph)
Gust Survival: 60 m/s (134 mph)
Sensor: 12-cm diameter cup wheel assembly, 40-mm diameter hemispherical cups
Accuracy: ±0.5 m/s (1.1 mph)
Turning Factor: 75 cm (2.5 ft )
Distance Constant (63% recovery): 2.3 m (7.5 ft)
Threshold: 0.5 m/s (1.1 mph)
Transducer: Stationary coil; 1300 ohm nominal resistance
Transducer Output: AC sine-wave signal induced by rotating magnet on cup wheel shaft 100 mV peak-to-peak at 60 rpm; 6 V peak-to-peak at 3600 rpm
Output Frequency: 1 cycle per cup wheel revolution; 0.75 m/s per Hz
Cup Wheel Diameter: 12 cm (4.7 in.)
Weight: 113 g (4 oz)

Wind Direction (Vane)

Range
Mechanical: 360°
Electrical: 352° (8° open)
Sensor: Balanced vane; 16 cm turning radius
Accuracy: ±5°
Damping Ratio: 0.2
Delay Distance (50% recovery): 0.5 m (1.6 ft)
Threshold with 10° Displacement: 0.8 m s^-1
(1.8 mph)
Threshold with 5° Displacement: 1.8 m/s
(4 mph)
Transducer: Precision conductive plastic potentiometer; 10 kohm resistance; 1.0% linearity; life expectancy of 50 million revolutions. Rated 1 Watt at 40°C, 0 Watts at 125°C.
Transducer Excitation: Requires regulated dc voltage, 15 Vdc maximum
Transducer Output: Analog dc voltage proportional to wind direction angle with regulated excitation voltage supplied by the datalogger
Vane Length: 22 cm (8.7 in.)
Weight: 170 g (6 oz)