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SMRT-Y Soil Moisture Sensor
•
Total Run Minutes is total run time required to bring moisture from the indicated moisture threshold to
Field Capacity
•
Soak Time Run Maximum is minutes allowed before surface accumulation causes runo
•
Soak Time Soak Minimum is minutes of soaking required to absorb surface accumulation.
•
Match your zone sprinkler head type and Field Capacity. If your pop-up sprayer zone has 35% Field
Capacity and your moisture threshold is 28%, your total run time is 23 minutes. Set your controller to
irrigate a total of 23 minutes, using a soak cycle with a maximum on time of 7 minutes and a minimum
soak’ time of 28 minutes.
Calculating Field Capacity / Moisture Threshold
Each lawn is dierent. Your Field Capacity and moisture threshold are unique. The following is the best method
to determine your ideal moisture threshold setting. Remember that you can adjust your moisture threshold at
any time.
Field Capacity Method
Near sundown, soak the soil to saturation in the area of the sensor. It is important that the area is very wet so
that the water is standing on the surface.
This can be accomplished with a 5 gallon bucket of water or a garden hose. The next morning, before the direct
sunlight reaches the sensor location, take a moisture reading by pressing the ‘Read Sensor’ button. This reading
is your soils Field Capacity. Your ideal moisture threshold setting should be 80% of Field Capacity.
Automatic Moisture Threshold Method
Near sundown, soak the soil around the sensor to saturation
with a 5 gallon bucket. Set your controller to irrigate at 5:00 am
the following morning.
Finally, simultaneously press and hold both the Read Sensor’
and ‘Soil Temp’ buttons while you depress and release the ‘Soil
EC’ button once. The Suspended Watering mode and Watering
Allowed mode will start blinking.
When your controller attempts to irrigate the following morn-
ing, the SMRT-Y will take a measurement and automatically set
your moisture threshold to 80% of Field Capacity.
Irrigation
Run-time Guide
45% 36% 58 11 41 29 5 43 95 15 30
40% 32% 52 11 32 26 5 34 84 15 21
35% 28% 45 16 25 23 7 28 74 19 12
30% 24% 39 20 19 19 8 24 63 22 4
25% 20% 32 34 4 16 11 13 53 25 0
20% 16% 26 48 0 13 13 13 42 30 0
15% 12% 19 88 0 10 17 9 32 33 0
10% 8% 13 300 0 6 21 6 21 37 0
VIEW THRESHOLD HOLD INCREASE DECREASE
TEMP. ºF or C HOLD PRESS
Read
Sensor
Soil
Temp
Soil
EC
Bypass
Sensor
HOLD HOLD
13


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