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Rain Bird SMRT-Y - Soil Moisture Sensor Kit

Rain Bird SMRT-Y - Soil Moisture Sensor Kit
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SMRT-Y - Soil Moisture Sensor Kit

Soil Moisture Sensor Kit

Turns any controller into a smart controller

The Rain Bird SMRT-Y Soil Moisture Sensor kit adds closed-loop feedback to irrigation systems, conserving water through on-off system control based on digital measurement of the soil’s volumetric water content.

How It Works:

The sensor takes soil moisture readings every 10 minutes. When the sensor detects dry conditions prior to the normal watering cycle, that cycle is allowed. When the soil moisture is above the set threshold, the watering cycle is suspended to avoid wasting water.


  • Makes any irrigation controller “smart”
  • Typical water savings of 40% or more
  • Simple, reliable design with two main components (sold as a kit)
    -In-ground soil moisture sensor
    -Sensor control user interface
  • Advanced Time Domain Transmissometry (TDT) digital sensor enables highly accurate readings that are independent of soil temperature and electrical conductivity (EC)
  • User interface displays soil moisture content as well as soil temperature and EC
  • Automatic moisture threshold setting with increase/decrease adjustment
  • Sensor connects to an existing zone wire to simplify installation
  • No-maintenance sensor - just bury and forget

Installation Overview:

SMRT-Y Install

Operating Specifications:

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


  • Sensor Control
    Overall Width: 3.0" (76mm)
    Overall Height: 3.0" (76mm)
    Overall Depth: 0.75" (19mm)
  • In-Ground Soil Moisture Sensor
    (dimensions not including wires)
    Overall Width: 2.0" (50mm)
    Overall Length: 8.0" (200mm)
    Overall Depth: 0.5" (12mm)


    SMRT-Y: Complete Kit Includes

  • Controller User 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 sticker that reads: “This controller is connected to a Rain Bird Soil Moisture Sensor”

Operating Principle

When soil moisture is above the established threshold, the irrigation cycle is suspended. When moisture falls below that level, the regular watering cycle is allowed.

SMRT-Y Chart

SMRT-Y Brochure
(PDF: 863 KB)

SMRT-Y Technical Specifications
(PDF: 536 KB)

SMRT-Y Wiring Guide
(PDF: 663 KB)

SMRT-Y Manual
(PDF: 1,531 KB)

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