Vaisala WINDCAP WMT700 Series - Table 23 Wind y and X Components at Different Wind Direction Angles

Parameter Definition
1 aout1, North-South, x component
aout2, West-East, y component
Typically, only the component x is used.
2 aout1, wind speed
aout2, wind speed alarm
A digital output: hi when wind speed > aout2_0
The following table shows the relationship between polar representation and the x and y
vector components.
Table 23 Wind y and x components at Dierent Wind Direction Angles
Wind Speed Wind Direction x Component y Component
1 0 -1 0
1 90 0 -1
1 180 1 0
1 270 0 1
4.7.2.1 Tunnel Application
In the tunnel application, airflow can be presented with one mA output channel, because
airflow goes along the tunnel. Typically, a relatively long average time (time constant) for
wind speed parameter is applied.
The sensor must be installed in a tunnel so that the sensor’s North is aligned with the tunnel.
The Aout1 channel (x component) provides the airflow in the tunnel. The following figure
shows a typical WMT700 installation in a tunnel.
WMT700 User Guide M211095EN-H
66