Decagon Devices ECH2O EA-10 Manuale dell'integratore - Pagina 11
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Stampa la paginaEA-10 Soil Moisture Sensor Integrator's Guide
3. How the EA-10 Works
3. How the EA-10 Works
In essence, the EA-10 monitors the water budget of
the soil in which it is placed. It senses water addition
and water loss. If the soil is too wet, irrigation can be
stopped. If the soil becomes too dry, additional irriga-
tion time can be programmed.
Proper monitoring of the water budget requires that
the moisture sensor be located in the active root zone
of relatively homogeneous vegetation, and in well-
drained soil of above-average moisture holding capac-
ity. Avoid locations where water can run-on or pool,
and locations with poor vegetative cover, or where
vegetation tends to water stress because of poor mois-
ture holding capacity of the soil or shallow root zone.
Vegetation in non-monitored zones will use water at a
rate proportional to water use in the monitored zone.
Water application rates in these zones must therefore
be proportional for the entire system to remain prop-
erly irrigated. If trees use 30% more water than turf,
and turf is being monitored, then the tree zone needs
to be irrigated for 30% more time than the monitored
turf to maintain adequate soil moisture.
Since dielectric probes (such as the EA-10) measure
the moisture in the immediate vicinity of the probe, it
is essential that the probe be installed so that the entire
length of the probe is in intimate contact with the soil
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