The 03002, manufactured by R. M. Young, measures wind speed and direction with a 3-cup anemometer and a wind vane mounted on a small crossarm. It interfaces directly with Campbell Scientific dataloggers; no signal conditioning is required.Read More
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.
|Applications||General (Rain with light snow. Little or no riming or blowing sand. No salt spray.)|
|Sensor||3-cup anemometer and vane|
|Measurement Description||Wind speed and direction|
|Operating Temperature Range||-50° to +50°C (assuming non-riming conditions)|
|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 (0 to 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||2.3 m (7.5 ft) 63% recovery|
|Starting 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)
|Electrical Range||352° (8° open)|
|Settling Time||20 ms|
|Sensor||Balanced vane; 16 cm turning radius|
|Delay Distance||0.5 m (1.6 ft) 50% recovery|
|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 data logger|
|Vane Length||22 cm (8.7 in.)|
|Weight||170 g (6 oz)|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
|CR500 (retired)||Measurements are typically processed for output with the Wind Vector instruction, which is not present in the CR500.|
|CR9000 (retired)||Measurements are typically processed for output with the Wind Vector instruction, which is not present in the CR9000.|
The 03002 is supplied with a 12-in.-long x 1-in. IPS unthreaded aluminum pipe, which mounts to a crossarm via a CM220 Mount or 17953 Nu-Rail fitting. The 03002 can also be mounted to the top of a CM106B or stainless-steel tripod via the CM216.
An ideal application for the Wind Sentry is wind profile studies. For this application, the LLAC4 4-channel Low Level AC Conversion Module can be used to increase the number of anemometers measured by one data logger. The LLAC4 allows data logger control ports to read the anemometer’s ac signals instead of using pulse channels. Data loggers compatible with the LLAC4 are the CR200(X)-series (ac signal ≤1 kHz only), CR800, CR850, CR1000, CR3000, and CR5000.
The anemometer is measured by the PulseCount instruction in CRBasic, and by Instruction 3 (Pulse Count) in Edlog. The wind vane is measured by the BrHalf Instruction in CRBasic, and by Instruction 4 (Excite-Delay-SE) in Edlog. The measurements are typically processed for output with the Wind Vector Instruction (not present in the CR500 or CR9000).