Figure 1, Wms series combined wind sensor – Vaisala WM30 User Manual
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User's Guide ________________________________________________________
8 ______________________________________________________ M210375en-A
averaging of transient intervals should be used, since two
pulses with non-symmetric positioning are generated during
one revolution.
The balanced wind vane is integrated in the housing,
underneath the cup wheel. The circular tail is located far
enough from the body and the cup wheel to avoid
turbulence due to these structures. The vane assembly is
made of PA reinforced with glass fiber providing durable
and lightweight structure with fast response and low inertia.
The angular position of the vane is detected using an axial
symmetric rotating potentiometer. The potentiometer
features low starting and running torque, linear arc-to-
resistance transfer ratio, and long operation life.
0212-220
Figure 1
WMS Series Combined Wind Sensor
The following numbers refer to Figure 1 above:
1
=
The cup wheel assembly
2
=
The vane assembly
3
=
The sensor compartment
WMS301 is equipped with a one-wiper type potentiometer
with an open gap of only 5 degrees. With constant voltage
applied to the potentiometer, the output voltage is directly
proportional to the azimuth angle.