
ēKo Pro Series User’s Manual
Page
9
Doc. # 7430-0710-01 Rev. C
Sensor Port 3
ON Button
Sensor Port 1
Status LED
Sensor Port 2
OFF Button
Sensor Port 4
Switchcraft
connector
Soil temperature
probe
Soil moisture probe
Figure 2-4. Bottom view of the ēKo node
2.4 ēKo Sensors
2.4.1 eS1101 soil moisture and soil temperature sensor
The eS1101 consists of a Watermark soil moisture sensor and soil temperature sensor which
temperature compensates the Watermark sensor. Up to four eS1101s can be connected to one ēKo
node to measure soil moisture at different soil depths.
The Watermark provides accurate readings from 0 to 200 centi bars. This covers the entire soil
moisture range required in irrigated agriculture, even in the heavier clay soils. The Watermark
measures soil water tension or suction which is a direct indicator of how hard the plant root
system has to work to extract water from the soil. The drier the soil, the higher the reading. By
monitoring the sensors between irrigations, it is possible to measure the rate at which the soil is
drying out.
Figure 2-5. eS1101 Soil Moisture and Soil Temperature
Sensor