Operator`s manual

23
Manual
Sensors
3.1 RM YOUNG 05103-L Wind Monitor
3.1.1 General
The Met Station includes the RM Young Wind Monitor with integrated anemometer propeller and wind vane for
measuring horizontal wind speed and wind direction. This model is originally developed for ocean data installed on
buoy platforms. It is rugged and corrosion resistant. Wind observations are mainly used for determining potential
evaporation. However, these measurements can also be useful for hydraulic design, selecting locations for windmills,
and positioning of airstrips, etc.
Sensors
Figure 7: RM Young Wind Monitor
Wind speed is measured by the anemometer, which consists of a propeller in a horizontal plane that rotate on
a vertical shaft. This rotation activates a sealed reed switch. Each open-closure event of this switch generates an
electric pulse, which is recorded by the datalogger. The rate of pulses is proportional to the wind speed.
Wind direction is also sensed electronically. The wind vane drives a 10-kilo ohm potentiometer connected to the
logger. The recorded voltage is a function of the declination of the vane, and thus of the wind direction.
For detailed technical specifications, the reader is referred to the corresponding Campbell Scientific Instruction
Manual for the RM Young Wind Monitor. Annex 7 explains calculating the wind vector.