Texas Instruments WR-25 instruction manual During Installation of the Various Sensors

WR-25 Instruction Manual

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 (see page 9) and step the direction around using the min or max key, or load the optional TWI_LOG program (see page 13) 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.

Texas Weather Instruments, Inc. WR-25 Instruction Manual