Vaisala WAA151 Installation Manual download pdf (Page 33)

Chapter 2 ___________________________________________________________Product Overview

VAISALA ________________________________________________________________________ 31

angular velocity of the cup wheel. The polyamide plastic reinforced

with carbon fiber guarantees a rigid structure even at the highest wind

speeds.

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 turbulences due to these structures. The vane

assembly is of PA (reinforced with glass fiber) providing durable and

lightweight structure with fast response and low inertia.

WAA151

0105-012

Figure 14 WAA151 Anemometer

WAA151 Anemometer is an optoelectronic, fast-response, low-

threshold wind speed sensor. In the cup wheel, it has three lightweight

conical cups providing excellent linearity over the entire operating

range, up to 75 m/s.

A heating element in the shaft tunnel keeps bearings above the

freezing level in cold climates. Nominally, it provides 10 W of heating

power. It is recommended to use a thermostat switch in the sensor

cross arm for switching the heating power on below +4 °C.

WAV151

WAV151 is a counter-balanced, low-threshold optoelectronic wind

vane. Infrared LEDs and phototransistors are mounted on six orbits on

each side of a 6-bit GRAY-coded disc. Turned by the vane, the disc

creates changes in the code received by the phototransistors. The code

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 132 133

No comments

Vaisala WAA151 Installation Manual Page 33