Vaisala WMS302 Guide de l'utilisateur télécharger pdf (Page 10)

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.

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Vaisala WMS302 Guide de l'utilisateur Page 10