Hunter Industries - The Irrigation Innovators

Sensors

How sensors work is quite simple: they interrupt the electrical flow from the controller that would otherwise activate the valve. The sensor does not interfere with the controller’s program.

Rain Sensors

These units are mounted in a location exposed to normal rainfall, but outside the watering spray of the sprinkler system. Rain will trigger the device, causing the system to remain off during or after an event if sufficient precipitation is measured. The rainfall settings can be adjusted so that a light shower will not affect system operation, to avoid eliminating a scheduled watering when rainfall is not sufficient to make up for a normal application.
Freeze Sensors

This type of sensor is very popular where ice on walkways or streets can cause liability, as well as in gardens where watering before or during heavy freezes can create problems with ice laden shrubs and trees. The freeze sensor interrupts the signal to the control valves when temperatures fall below freezing. Once conditions improve, the system will return to normal operation.
Flow Sensors

This type of sensor helps to identify a break in the system before any damage can occur. A rupture pipe or a broken sprinkler left undetected can flood the ground, erode slopes, even undercut driveways and sidewalks. A flow sensor is set to activate at a specified level of flow; once that level is exceeded, the circuit is broken and the valves are shut off.

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Residential System Components Overview
Controllers | Sprinklers | Valves | Sensors

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Residential Irrigation System Design Guide