Texas Instruments WR-25 User Manual
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C A U T I O N !! :BE EXTREMELY CAREFUL NOT TO TOUCH ANY HIGH POWER LINES
DURING INSTALLATION OF THE VARIOUS SENSORS!!!
The WR-25 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 at least 10 feet above the roof
of the building. The higher the installation, the more accurate the readings. There is one yellow
cable consisting of eight wires that must be strung from the wind sensor to the console. The wind
direction sensor is calibrated at the factory and should be installed with the mounting arm pointed to
the North. The wind sensor arm can be mounted and calibrated in any direction, but it is more
convenient to use North as a reference. If calibration is necessary after the unit is already mounted,
pick a calm day or immobilize the wind vane by hand. Enter calibration mode on the display (
) and step the direction around using the min or max key, or load the optional TWI_LOG
) in your computer and change item 7, wind dir offset, until the proper
direction achieved.
The outside
temperature/humidity sensor
should be mounted under the eaves, out of the rain and
sun. The humidity sensor is light sensitive, if the humidity sensor cover is left off allowing light to hit
the sensor element the humidity will read 0%. (If it is desirable to mount the temperature/humidity
sensor directly on the mast, the optional
pagoda
housing should be secured at the time of purchase
of the Weather Report.) One of the best places to mount this sensor is on the north side of the
building where it is shaded most of the year. Remember, the sensor will detect the exact
temperature and humidity where the sensor is located. If it is located above an air conditioning unit,
it will read that artificially hot air -- location is very important! Ideally, the outside
temperature/humidity sensor should be mounted with the sensor facing down. Mounting the sensor
vertically is also satisfactory. Never mount the sensor face-up, exposed to rain. Water will collect in
the sensor, creating inaccurate readings. Remove the four screws securing the cover of the
temperature/humidity sensor, exposing two mounting holes. Mount the sensor utilizing the screws
provided; replace the cover. This sensor has one blue cable which must be connected into the
weather station. The optional outside temperature/humidity pagoda should be mounted about two
feet under the wind sensor. Again we suggest at least a ten foot mast to overcome the artificially
high readings generated by a hot roof.
The rain collector is normally mounted on the mast. It should be mounted as low as possible 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 collector unencumbered by surrounding
obstacles. Use a bubble level to make sure that the collector is perfectly level with the ground.
Failure to level the collector will cause inaccurate rainfall readings. The rain collector has one blue
cable which must be connected to the console.
Plug the sensor cables and the serial cable into the connectors in the rear of the console. Plug the
wall transformer into a 120V wall socket to power up the unit.
WR-25 Instruction Manual
Texas Weather Instruments, Inc. WR-25 Instruction Manual