Product overview, Introduction to wav151 wind vane, Chapter 2, product overview, introduces the wav151 – Vaisala WAV151 User Manual
Page 9: Wind vane features and advantages, Chapter 2
Chapter 2 ____________________________________________ Product Overview
VAISALA___________________________________________________________7
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the WAV151 Wind Vane features
and advantages.
Introduction to WAV151 Wind Vane
The WAV151 Wind Vane 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. Rotated by the vane, the disc
creates changes in the code received by the phototransistors.
The code is changed in steps of 5.6°, one bit at a time to
eliminate any ambiguities in the coding.
A heating element in the shaft tunnel keeps the temperature
of the 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.