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Nelson Rain Sensor

The world’s most simple, accurate, rugged, and reliable rain sensors.

There’s nothing more embarrassing–or more wasteful or costly–than an irrigation system that runs when it doesn’t have to…in the rain. Rain-Trip® provides the simplest, most effective way to prevent sprinklers from coming on during or after precipitation. It easily installs on any automatic irrigation system, then shuts sprinklers off in a storm and keeps them off, automatically compensating for the amount of rainfall that occurred. Disks absorb water and expand proportionally to the amount of rain that fell (e.g., a small cloudburst would result in little absorption, a 6" thunderstorm would lead to more absorption and expansion). As the moisture-laden disks expand, they eventually activate a switch that interrupts the circuit from the controller to the solenoid valves. Once dry, they contract and release the switch. Thus, Rain-Trip automatically resets without ever affecting your controller. There’s no better way to ensure that a system isn’t watering when it isn’t necessary.


  • Saves unneeded watering
  • Easily installs on any automatic irrigation system
  • Versatile enough to work with all popular controllers (Ready for normally-closed or normally-open hookup)
  • Unit ready for bracket mount or 1/2” (12,7 mm) conduit/pipe thread mount at bottom
  • Patented mechanism cannot be fouled by dirt or debris
  • Reliable operation; no false shutdowns
  • Adjusts to actuate at various rainfall quantities
  • Set from 1/8" (3,2 mm) to 1" (25,4 mm)based upon your local conditions
  • Includes 25 feet of 20 gauge two conductor wire
  • Fast and easy mounting out of sight

  • [Click image to enlarge ]

    Rain-Trip Model ***Discontinued***(NA-8501) x 36.98$ Out of Stock



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