Campbell Scientific 03002, 03101, and 03301 R. M. Young Wind Sentry Sensors - Manual (Page 15)

R.M. Young Wind Sentry
Threshold: 0.5 m s –1 (1.1 mph)
Transducer: Stationary coil, 1300 ohm nominal resistance
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 –1 per Hz
Cup Wheel Diameter: 12 cm (4.7 in)
Weight: 113 g (4 oz)
6.2 Wind Direction (Vane)
Range: 360° mechanical, 352° electrical (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: 0.8 m s –1 (1.8 mph) at 10° displacement
(1.8 m s –1 (4 mph) at 5° displacement)
Transducer: Precision conductive plastic potentiometer;
10 k
Ω resistance; 1.0% linearity; life expectancy 50
million revolutions
Rated 1 W at 40°C, 0 W at 125°C
Transducer Excitation
Requirement:
Regulated dc voltage, 15 Vdc max
Output: Analog dc voltage proportional to wind direction
angle with regulated excitation voltage supplied by
the datalogger
Vane Length: 22 cm (8.7 in)
Vane Weight: 170 g (6 oz)
6.3 Wind Sentry Assembly
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
7. Installation
7.1 Siting
Locate wind sensors away from obstructions (e.g. trees and building). As a
general rule of thumb, there should be a horizontal distance of at least ten times
the height of the obstruction between the wind set and the obstruction. If it is
necessary to mount the sensors on the roof of a building, the height of the
sensors above the roof, should be at least 1.5 times the height of the building.
See Section 10, References, for a list of references that discuss siting wind
speed and direction sensors.
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