NovaLynx Corporation
200-WS-01
Page 6
April 2021
revolution of the cups, reducing demands on an electronic counter compared to the three-pulses per
revolution of the wind speed sensors.
The calibration constant for wind run is 960 pulses per mile (596.5 pulses per kilometer). The reciprocal
of these numbers gives the value of each pulse: 0.001042 miles per pulse (0.001676 km per pulse).
5.2
Wind Speed Sensors
WeatherPort wind speed sensors produce three switch closures for each revolution of the cup
assembly. The ratio of closed-to-open time is nominally 1/10 of the total period for a revolution of the
wind cups. This duty cycle may change slightly as the sensor ages and with exposure to temperature
extremes.
Note:
Model 200-WS-01B-TS has a slightly higher starting threshold due to a characteristic of the Teflon
bearing.
6
SITE SELECTION
WARNING: Avoid overhead power lines whenever possible. If there are overhead power lines, use
extreme care to prevent contact with the power lines while installing the equipment.
Choose a mounting location for the wind sensor that is free of obstructions since nearby objects can
create eddy currents that will affect the wind measurements. Try to locate the wind sensor so that the
nearest object is 10 x T away from the wind sensor mast, where T is the height of the object.
Roof mounted sensors should be placed on the upwind side of the building and away from all exhaust
vents. If the sensor is located on top of a building the sensor height should be 1.5 x H, where H is the
height of the building.
In all cases when the wind sensor data is to be correlated to National Weather Service data or World
Meteorological Organization data, the standard exposure is 33 feet (10 meters) above the ground.
