A complete picture of the wind is of great importance for environmental issues. Up to now it has been prohibitively expensive to obtain a complete picture of the wind. Unaffordable ultrasonic anemometers were the order of the day and the result was that measurement was usually reduced to a 2D measurement of wind speed and direction, the important vertical wind component having been ignored.
RM Young now offers an affordable, reliable and accurate ultrasonic 3D anemometer with no moving parts. The Model 81000 offers an economical solution and features robust construction with three opposing pairs of ultrasonic transducers supported by stainless steel members. This arrangement provides rigidity to the anemometer while offering a measure of protection to the transducers.
The transducers are arranged so that measurements are made through a common volume, thereby improving the validity of the measurement. A fast, 160 Hz sampling rate ensures superior measurement resolution. The model 81000 installs on standard 2,5 mm pipe and wiring connections are in a convenient junction box. Analog or digital output is selected by jumper placement inside the junction box; a variety of formats are available. Auxiliary analog inputs are provided for attachment of temperature and humidity probes and other sensors. These measurements are then transmitted serially with the wind data.
Digital output formats include a user-programmable ASCII output configuration (select from U, V, W, speed of sound, sonic temperature, 2D speed, 3D speed, azimuth angle, elevation angle) preset outputs: NMEA and RMYT. Velocity units include m/s, cm/s, mph, knots and km/h. The unit measures 550 x 340 mm (height x diameter), and weighs 1,7 kg.
Specifications: sample rate 160 Hz, accuracy ±1%, resolution 0,01 m/s, averaging (user-selected), 0-30 m/s range, four voltage inputs: (2 each) 0-1000 mV, 0-4000 mV, 12 bit outputs: 8 to 32 Hz (user-selected), outputs: RS232 or RS485 (9600-38 400 baud), three voltage outputs, (uvw or speed/azimuth/elevation).
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