ECOWITT WH2910, Operation Manual

Page: 35 / 67

35
(4) Only use this if you improperly installed the weather station sensor array,
and did not point the direction reference to true north.
(5) Wind speed is the most sensitive to installation constraints. The rule of
thumb for properly installing a wind speed sensor is 4 x the distance of the
tallest obstruction. For example, if your house is 20’ or 6.10m tall and you
mount the sensor on a 5’ or 1.52m pole:
Distance = 4 x (20 – 5)’ = 60’ or =4 x (6.10-1.52)=18.32m.
Many installations are not perfect and installing the weather station on a roof
can be difficult. Thus, you can calibrate for this error with a wind speed
multiplier.
In addition to the installation challenges, wind cup bearings (moving parts)
wear over time.
Without a calibrated source, wind speed can be difficult to measure. We
recommend using a calibrated wind meter (not included) and a constant
speed, high speed fan.
Note: If located in southern hemisphere, please follow the steps to calibrate
the wind direction:
1. Install the outdoor sensor package with the West arrow on the
sensor pointing due East.
2. Check the wind direction offset (Default: equals to the current wind
direction )
If:
Current wind direction offset < 180, then it should be calibrated to be:
current wind dir 180
If:
Current wind direction offset > 180, then it should be calibrated to be:
current wind direction - 180