Efficient IrrigationHow Acclima Irrigation Works
The heart of all Acclima controllers is the Digital TDTT 
sensor. Buried three to four inches deep in the root zone, it regularly communicates moisture information to the controller. This feedback allows the controller to intelligently irrigate only when soil moisture level requires. Soil moisture content is automatically maintained within an optimal range throughout the irrigation season. A single sensor can control multiple irrigation zones. A typical residence may require just one sensor; an institutional property may employ 7 or 8 sensors in various microclimates.
How It Works
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.
Sensor Use
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.