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SMRT-Y Soil Moisture Sensor
Setting the Watering Schedule
Field Capacity is the amount of water your soil will hold at equilibrium. The amount of water required to bring
the moisture content of the soil from 80% of Field Capacity to 100% of Field Capacity is given by the formula:
Inches of water = 0.2 * Field Capacity * depth
If your Field Capacity is 25% and you are watering to a depth of 8 inches, then the amount of water needed is
0.2 * 0.25 * 8 = 0.4 inches
If you know the eective precipitation rate of your sprinklers, then the watering time is given by:
Run time minutes = 60 * Inches / Eective Precipitation Rate
If your Eective Precipitation Rate for the example above is 0.5 inches per hour, then the minutes watering time
is 60 * 0.4 / 0.5 = 48 minutes.
The chart on the next page oers a simple way to set watering times for all zones in your system. It is based on
the formulas given above. After you have measured the Field Capacity of your soil (see next page), you can use
the chart to nd watering times for your zones. You will need to know the type of sprinkler heads installed and
their precipitation rates.
Watering History
The SMRT-Y user interface displays the past 7 watering
attempts. If the SMRT-Y allowed watering, a drop is
displayed. If the system was suspended, it will be blank.
‘Today’ indicates the most current watering cycle. The
history updates 30 minutes after each cycle.
Suspending Watering
When the moisture in the soil is above the moisture
threshold, the Suspended Watering’ icon appears. Your
system will not irrigate.
Watering Allowed
When the soil moisture is below the moisture threshold,
the ‘Watering Allowed’ icon appears. This icon is also
displayed when the ‘BYPASS SENSOR’ is activated.
Your system will irrigate normally.
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