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Rain Sensor Site Selection
Choosing the right installation site for the sensor module is key to obtaining the maximum benefit
from your sensor system. For best results, choose a sensor installation site that provides:
• Unobstructed exposure to rainfall–away from overhangs, tree branches, etc.
• Protected from irrigation spray, rainwater accumulation and the possibility of submersion.
• Exposure to sunlight and shade conditions similar to the landscape being watered.
• Good communication signal from the sensor to the receiver.
Note: If installing a TWRFS-I rain/freeze sensor specifically for freeze detection, refer to the
additional site selection criteria provided on page 13.
Before installing the sensor module, test the system again to confirm operation by using the
following test procedure:
1. Activate a watering zone that is visible from the intended sensor installation site.
Note: The manual operation mode of some irrigation controllers may bypass the sensor circuit.
If your controller operates like this, set an automatic cycle to start within a minute or two.
2. With the sprinklers on, press and hold the sensor test spindle until the sprinklers shut off.
Note: Irrigation control valves close at various rates. It may require several seconds for the
sprinklers to shut off.
If the test is successful, the sensor is ready to install. If the sprinklers do not shut off, try moving
the sensor a few feet in either direction and test again. Rotating the receiver antenna slightly may
improve the signal strength. Refer to “Troubleshooting” on page 22 for additional information.
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