2. Product Overview
2.1 Vaisala Anemometer WAA151
1 Cup wheel assembly
2 Sensor shaft
3 Lower body
WAA151 is a fast-response, low-threshold anemometer. Three lightweight, conical cups
mounted on the cup wheel provide a linear response rate over the entire operating range, up
to 75 m/s (168 mph).
A wind-rotated chopper disc attached to the shaft of the cup generates a pulse output from a
phototransistor in the base of the sensor. The output pulse rate is directly proportional to wind
speed.
The heating element in the shaft tunnel keeps the temperature of the bearings above the
freezing level in cold climates. The nominal heating power is 10 W. Vaisala recommends that
you use a thermostat switch in the cross arm for switching the heating power on below +4 °C
(+39 °F).
2.2
Safety
The WAA151 anemometer delivered to you has been tested for safety and approved as shipped
from the factory. Note the following precautions:
Ground the product and verify outdoor installation grounding
periodically. Failure to provide proper grounding can result in injury or death
from electrical shock and can severely damage the equipment.
WARNING!
Chapter 2 – Product Overview
5
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