Detailed Description

The 034B-ET monitors wind speed using a three-cup anemometer that contains a sealed magnetic reed switch. Rotation of the cup wheel produces a pulse that is directly proportional to wind speed. The frequency of the pulse is measured by the data logger pulse count channel, then converted to engineering units (mph, m/s, knots).

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


Operating Temperature -30° to +70°C
Cable Length 170.18 cm (67 in.)
Weight 907 g (2 lb)
Wind Speed (Anemometer)
Range 0 to 75 m/s (0 to 167 mph)
Accuracy < 10.14 m/s (22.7 mph) 0.1 m/s (0.25 mph)
Accuracy > 10.14 m/s (22.7 mph) ±1.1% of true
Resolution (0.7998 m s-1) / (scan rate in seconds) or (1.789 mph) / (scan rate in seconds)
Starting Threshold 0.4 m/s (0.9 mph)
Sensor Output Pulsed contact closure
Anemometer Radius 10.7 cm (4.2 in.)
Anemometer Height 24.4 cm (9.6 in.)
Wind Direction (Vane)
Mechanical Range 360°
Electrical Range 356° (4° open)
Accuracy ±4°
Damping Ratio 0.25
Resolution < 5°
Potentiometer Resistance 0 to 10 kΩ (open at crossover)
Vane Length 33.5 cm (13.2 in.)