Programming instructions

24 Designer’s Guide
Calsense
Benefits of the FLOWSENSE option include:
• Eliminates the need for relays when sharing pumps or master valves with several controllers
• Manages the number of valves that can be turned on at a time based on system flow capacities
• Eliminates scheduling conflicts with multiple controllers
• Provides water management capabilities with or without a Flow Meter
Water Management
With FLOWSENSE, the user has the ability to control the number of valves turned on based on the flow
capacities of the system. This minimizes the water window; thus, the allowable system flow rate is never
exceeded, ensuring pumps operate at their capacity and the entire irrigation system functions at
maximum efficiency. The user is able to select the maximum system flow rate both with and without
pumps. In addition, the user can control the number of valves coming on for areas of the main line based
on mainline capacities.
The final result is an irrigation system operating at maximum efficiency, all controlled in the field solely
by the ET2000e Irrigation Controllers. Additionally, turning on stations by using the manual key or a
handheld radio remote ensures that, even during programmed irrigation, the maximum capacity of the
system is not exceeded.
Flow Monitoring
Similar to a single controller, FLOWSENSE accurately pinpoints valves with high flows caused by broken
risers or pipes and low flows. When such a flow event occurs, affected valves are identified, shut down,
and alerts are generated to notify the user for quick and easy repair. The controllers also identify
electrical problems, such as shorted solenoids and broken wires.
When a faulty valve is detected and shut off, another valve is turned on. Thus, FLOWSENSE is always
working to shorten the water window and maximize pump efficiencies while not exceeding the irrigation
system capacity.
Communication Options
Communication between ET2000e controllers is possible using a Hardwire link, a Spread Spectrum Radio,
or a combination of the two. This provides maximum flexibility when designing a system spanning a large
area. In the event of a permanent communication problem, such as a broken hardwire, the controllers
automatically revert to standalone operation, allowing irrigation to continue even though the
communication link is broken.
As soon as the FLOWSENSE communication link is re-established, the controllers immediately operate
as a single system again.
Hardwire
The FLOWSENSE option, using the Hardwire communication option (model -M), links up to 12
controllers using a standard Paige P7171D communication cable. This communication method is well
suited for irrigation systems where controllers are in close proximity to one another or already have
conduit running between them.
For more information about the hardwire communication option, see Hardwire (model -M)
on page 54.
Spread Spectrum Radio
Using the Spread Spectrum Radio communication option (model -SR) for FLOWSENSE provides the
ability to link several ET2000e controllers using embedded radios. These radios operate in an unlicensed