User`s guide

User’s Guide ______________________________________________________________________
46 ___________________________________________________________________M210662EN-A
Ultrasonic Wind Sensor
0404-098
Figure 36 Ultrasonic Wind Sensor WS425
Ultrasonic Wind Sensor WS425 uses ultrasound to determine wind
speed and wind direction. The measurement is based on transit time, the
time it takes for the ultrasound to travel from one transducer to another,
depending on the wind speed. The transit time is measured in both
directions for a pair of transducer heads. Using two measurements for
each of the three ultrasonic paths at 60° angles to each other, WS425
computes the wind speed and direction. The wind measurements are
calculated in a way that completely eliminates the effects of altitude,
temperature and humidity.
The sensor has no moving parts and it is resistant to corrosion and
contamination since exposed surfaces are stainless steel. In addition to
improving accuracy and the reliability of data in all wind conditions and
climates, WS425 eliminates on-demand and periodic maintenance.
Optionally, WS425 has a built-in heater. The heated model has
thermostatically controlled heaters in the transducer heads to prevent