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SMRT-Y Soil Moisture Sensor
Introduction
Congratulations on your purchase of the Rain Bird SMRT-Y Soil Moisture Sensor kit, utilizing the the most
advanced technology available on the market. You have joined those interested in conserving water, Earths
most important resource, while optimizing the root health of your turf and trees.
Items Needed
Before you start installing your new Rain Bird Soil Moisture Sensor:
for Sensor Installation (SMRT-SMS) for User Interface Installation (SMRT-Y)
•
Use 18 AWG wire or equivalent for
splicing and burial
•
Grease caps or equivalent waterproof
connectors (3)
•
7” valve box (optional)
•
Flat blade shovel
•
Wire strippers/pliers
•
Medium Philips screw driver
•
Drill
•
Wire strippers/Pliers
•
Connect to a UL listed irrigation controller
or equivalent
Panel Description
LCD Display Displays soil moisture, soil temperature, electrical conductivity. It also
displays Watering history (see page 12).
Read
Sensor
Read Sensor Read sensor displays and sets the moisture threshold. This threshold is the
volumetric soil moisture level at which the SMRT-Y disrupts irrigation.
Soil
Temp
Soil Temp Displays soil temperature. Increments up when “Read Sensor is depressed.
Press and toggle “Soil EC” to display Fahrenheit or Celsius
Soil
EC
Soil EC Displays soil electrical conductivity, increments down when “read Sensor”
is depressed. Changes between Fahrenheit and Celsius when “Soil Temp” is
depressed.
Bypass
Sensor
Bypass Sets the SMRT-Y user interface to Bypass mode, disabling the sensor.
How it Works
The SMRT-Y uses a Digital Time Domain Transmissometry Soil Moisture Sensor buried in your lawn to accurately
monitor the Volumetric Water Content of your soil. The SMRT-Y user interface connects to your existing
irrigation controller. Your controller is programmed to water on a regular basis. The SMRT-Y takes soil moisture
readings every 10 minutes. If the water content of the soil is above the set threshold for your soil, then the
SMRT-Y will suspend the irrigation cycle by interrupting the power to your solenoid valves. This power is
restored after 30 minutes of controller inactivity.
!
NOTE: Taking a manual reading during a controller cycle or within 30 minutes after the end of a
cycle will not aect the Water Suspended/Allowed mode of the user interface. If you push “Read
Sensor during this period, the user interface may show a moisture reading above the moisture
threshold. The interface will not change state or suspend irrigation until a reading is made outside
of this time period. This assures that all programmed zones receive water during an allowed
controller cycle.
If the water content in the soil is below the threshold when your controller begins its cycle, the SMRT-Y allows
the controller and its irrigation programs to operate normally. The connection will be maintained for the entire
watering cycle and for 30 minutes thereafter. The SMRT-Y has provisions to water two zones independent of
the sensor to accommodate drought-tolerant planting, cacti, trees, potted plants, drip zones, etc (see page 14).
3


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