Vaisala WM30 - Manual (Page 9)

Chapter 2 ____________________________________________ Product Overview
VAISALA___________________________________________________________7
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the WMS301 and WMS302
Combined Wind Sensor features.
Introduction to WMS Series Wind Sensors
WMS series wind sensors are compact sized instruments
with the wind speed and direction sensors integrated into
one unit. The sensor electronics is located inside a
watertight compartment providing full protection against
water, dust, pollutants, and electromagnetic interference.
The cup wheel shape, dimensions, and material have been
carefully designed to achieve maximum measurement
quality. The conical cups have been tested to give linear
response between wind speed and angular velocity of the
cup wheel. The polyamide plastic reinforced with carbon
fiber guarantees a rigid structure even at the highest wind
speeds.
The anemometer ball bearing assembly is composed of a
wheel shaft, a pair of low friction ball bearings, and a shaft
fixed magnet. A reed relay with electronics located in the
body of the sensor converts the cup wheel rotation to pulses.
Therefore, when properly supplied the sensor can be read
practically with any data logger, either by counting the
number of pulses within a fixed time period or measuring
the time between successive transients. In the latter method