SMRT-Y Soil Moisture Sensor

Accurate - Reliable - Smart

It’s time for a little feedback from the roots. With the new SMRT-Y Soil Moisture Sensor Kit from Rain Bird, an irrigation controller is directly linked to the absolute moisture requirements of a site’s vegetation.

When the sensor detects dry conditions, the next scheduled watering cycle is allowed. If a site’s soil moisture level is above the threshold, the irrigation cycle is suspended. There are just two basic components:  an in-ground sensor and a user interface at the controller.


  • Turns any controller into a water saving smart controller
  • Healthier landscapes less prone to nutrient depletion, fungus, and shallow root growth
  • Typical water savings exceed 40%
  • TDT digital sensor enables highly accurate readings that are independent of soil temperature and electrical conductivity (EC)
  • Displays soil moisture content, soil temperature and EC
  • Corrosion-resistant in-ground sensor made of high-grade 304 stainless steel


Operating Specifications

  • 25 Volts AC at 12W
  • Operating temperature: -4°F to 158°F (-20°C to 70°C)
  • Survival temperature: -40°F to 185°F (-40°C to 85°C)


  • cULus [US and Canada], FCC Part 15b [US], CE [European Union], Smart Approved WaterMark [Australia].


  • Controller Interface
    • W: 3.0" (76mm); H: 3.0" (76mm); D: 0.75" (19mm)
  • In-Ground Soil Moisture Sensor (without wires)
    • W: 2.0" (50mm); L: 8.0" (200mm); D: 0.5" (12mm)
    • 18 AWG wire leads @ 42 in. (106.7 cm) length


  • Includes
    • Controller Interface
    • In-Ground Soil Moisture Sensor
    • Anodized, rust-proof screws, 1.5" (two per package)
    • Wire nuts – 5 blue, 2 gray, 1 yellow
    • Multilingual instruction manual, “Quick Start” Guide, and Soil Moisture sticker

    Model Comparison

    • SMRT-Y: Soil Moisture Sensor Kit
    • NEW FOR 2018: All SMRT-Y models are RoHS compliant