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A pulse of
electricity is sent along the outer rod of the submerged
sensor. As this pulse travels the rod, it is delayed by the
moisture content of the soil and distorted by the soil
chemistry. As the pulse reaches the other end of the rod, it
is digitized at 25 Pico second intervals (about how long it
takes light to travel .3 inches). A proprietary digital
signal processing system then extracts the critical
information. The
Result is a highly accurate absolute
measurement of soil moisture as well as a reporting of soil
temperature and conductivity. |
All Acclima
irrigation controllers utilize the Digital TDT Moisture
Sensor as a “closed loop” feedback mechanism in controlling
the irrigation process. The Controller constantly
interrogates the sensor for actual soil moisture readings,
allowing the controller to intelligently apply only the
amount of water lost through evapo-transpiration (soil
moisture lost through evaporation and plant use). Thus, root
zone moisture levels are perpetually maintained at user
specified levels and water use is optimized. |
