3
SMRT-Y Soil Moisture Sensor
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 affect 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 25).
