Texas Instruments WRL-10 - Manual (Page 2)

Texas Weather Instruments, Inc. 2 WRL Instruction Manual
There is lightning protection (transient voltage suppressers) built into the junction box. It
is very important that the mast is grounded or else the transient voltage suppressers will
not protect your instrument. The junction box picks up earth ground through the hose
clamps mounting the box. We suggest that you install a copper-grounding rod
(available at Radio Shack) and run the heavy gauge wire directly behind the hose
clamps of the junction box. This arrangement will ground your mast and your junction
box.
C A U T I O N !! :BE EXTREMELY CAREFUL NOT TO TOUCH ANY HIGH POWER
LINES DURING INSTALLATION OF THE VARIOUS SENSORS!!!
The wind direction and speed sensor is normally mounted on television type antenna masts
(see Figure 1). For best results the wind sensor should be mounted twenty feet above the
roof of the building. Higher installation yelds more accurate readings. There is one yellow
cable that must be strung from the wind sensor to the console via the junction box. The
wind direction sensor is calibrated at the factory and should be installed with the wind
sensor arm pointed to the North. The wind sensor can be mounted in any direction and
recalibrated via the WRL console, but it is more convenient to use the precalibrated North
reference. If calibration is necessary after the unit is already mounted, pick a calm day or
immobilize the wind vane by hand and use calibraton mode to make these changes. The
outside temperature/humidity pagoda should be mounted about two feet under the wind
sensor. Again, we suggest a twenty-foot mast for commercial installations to overcome the
artificially high readings generated by a hot roof. Plug the temperature/humidity pagoda
cable into the blue RJ45 connector in the junction box.
The rain collector is normally mounted on the mast. It should be mounted as low as
possible both to reduce windage and to limit movement of the mast, which can cause false
readings. The collector should be mounted in a manner that allows rain to enter the