Wind speed

Sensor / transducer type
Measurement range
Starting threshold
Distance constant
Accuracy (range 0.4...60 m/s)
    with characteristic transfer function
    with transfer function U=0.1xR

cup anemometer / opto-chopper
0.4...75 m/s
<0.5 m/s *
2.0 m

±0.17 m/s **
±0.5 m/s

* Measured with cup wheel in position least favoured by flow direction. Optimum position gives approx. 0.35 m/s threshold.
** Standard deviation.

Wind direction

Sensor / transducer type
Measurement range
(wind speed 0.4...75 m/s)
Starting threshold
Delay distance
Resolution
Accuracy

vane / optical code disc
0...360°

<0.4 m/s
0.4 m
±2.8°
better than ±3°

Inputs and outputs

Operating power supply
      WAA151, WAV151
Heating power supply
      WAA151, WAV151
Output for WAA151 (wind speed)
      Transducer output
      Transfer function

      Transducer output level

Output for WAV151 (wind direction)
      Transducer output
      Transducer output level
         

U=9.5...15.5 VDC, 20 mA typical

20 VAC or VDC, 500 mA nominal
 
0...75 m/s = 0...750 Hz square wave
U = 0.328 + 0.101 x R
(U = wind speed [m/s], R = o/p pulse rate [Hz])
(Iout < +5 mA) high state > U_in-1.5 V
(Iout > -5 mA) low state < 2.0 V

6-bit parallel GRAY code
(Iout < +5 mA) high state > U_in-1.5 V
(Iout > -5 mA) low state < 1.5 V              

Operating temperature

With shaft heating
Storage temperature

-50...+55 °C (-58...+131 °F)
-60...+70 °C (-76...+158 °F)

Spare parts

Common spare and wearing parts are available. For availability contact sales.

Repair

Repair services are available at Vaisala service centers for a fixed price.

Repair price includes:
-repair work
-required parts
-service report

Technical support

Technical support for your installed units, contact helpdesk@vaisala.com.