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No. The rain sensor merely overrides the cycle until the rain sensor's disks or water collection dish dry out. The irrigation system's timer will then come back online to the regular irrigation schedule. The rain sensor should be set to shut off the system when up to 1/4" of rainfall has occurred.

1. What is a rain sensor?
   
2. What is the ideal installation location for a rain sensor?
   
3. Is a rain sensor required?
   
4. Do I need a permit to install the rain sensor?
   
5. Will a rain sensor affect the schedule of my automatic timer?
   
6. Who can install rain sensors?
   
7. Where can I purchase a rain sensor for my sprinkler system?
   
8. What are the advantages of having a rain sensor?
   
9. How long will the system stay off after it rains?
   
10. Which setting do I use?
    
11. After it rains, sprinklers stay off too long. What is wrong?
    
12. Can I use 1 rain shut-off device for two controllers?
    
13. How long do the disks last?
    
14. Will I lose my controller settings if the rain sensor shuts my system off due to rain?
    

Courtesy of Dr. Dorota Hamon, Professor of Agricultural and Biological Engineering, University of Florida