Vents control drying
time of discs
6
The installer should also take into consideration the
soil type of the site when determining the shut “down
period” of the irrigation system after the rain sensor has
shut down the irrigation system. A suggested guideline
for the “shut down” period to allow the soil to “dry
out” is listed in the table below:
Illustrative
Example:
A residential site
in Florida with
sandy loam soil
has a Hunter
Rain-Clik™ rain
sensor mounted on the roof rain gutter as an integral
part of the irrigation system. The vent ring on the
sensor is adjusted to the mid-point setting, partially
blocking the air vents controlling the time to dry out
the discs to approximately 2 days.
Scenario #1: While the irrigation system is operating,
a rainstorm dumps in excess of ¾" of rain on the site
over a two-hour period. The single hygroscopic disc
that activates the Quick Response™ feature becomes
saturated and the system is shut down shortly after it
starts to rain. As the rainfall continues, the hygroscopic
discs in the main compartment of the sensor become
saturated and swell in height, continuing to hold the
microswitch closed, which in turn keeps the irriga-
tion system deactivated. After the rainfall stops, the
discs will dry as the irrigation site dries out. The rate at
which the discs dry is adjustable via the vent ring posi-
tion. Once the discs dry out, their height shrinks back
to their original dimensions, releasing the micro-switch
and thereby allowing the irrigation system to operate
per the programs on the controller.
Scenario #2: While the irrigation system is operating,
a light rain shower occurs on the same site that lasts for
only 10 minutes. The single hygroscopic disc that acti-
vates the quick response feature becomes saturated and
the system is shut down as soon as it starts to rain. The
air vent that surrounds this single disc is calibrated to
allow the disc to dry out in 1 to 3 hours depending on
the climatic conditions of the site. After this “dry-out”
period, the irrigation system will resume its operation
based on the controller programs.
Note: Due to the limited rainfall from this rain shower,
the stack of hygroscopic discs in
the main compartment did not get
saturated enough to activate the
micro-switch and
therefore the sustained
shut down period as set
by the main vent ring
adjustment does not
become a factor.
Constructed of High Impact Thermoplastic…
Built to last, even in the most severe environments
The Rain-Clik is constructed of heavy-duty non-cor-
roding materials, including thermoplastics that can
withstand all extremes of weather from direct scorch-
ing sunlight to freezing ice storms.
Maintenance-Free Patented
Sensing Mechanism…
No callbacks, set it and forget it
Unlike other rain sensors that use collection cups, the
Rain-Clik does not collect debris, so it does not require
ongoing maintenance or cleaning. And, for those
in cold climates, the Rain-Clik does not have to be
removed or covered for “winterizing” purposes. This
means no required maintenance for the unit and no
callbacks to clean it.
The sensing mechanism is ingenious but simple.
The single hygroscopic disc that activates the quick
response feature as well as the stack of multiple hygro-
scopic discs absorb water and then expand proportion-
ally to the amount of rainfall. As the moisture-laden
discs expand, they eventually activate an electronic mi-
cro-switch that interrupts the circuit from the controller
to the valves. As the discs dry out, they contract in size
and release the switch.
Includes 25 Feet of 20 Gauge Two
Conductor Wire…
Fast and easy mounting out of sight
Hunter supplies wire needed for sensor installation
within 25 feet of the controller. Whether you pre-install
the sensor on poles or at the job utilizing any of the
three different mounting options, with 25 feet of wire
already attached to the Rain-Clik, installation is fast
and easy. When contractors arrive on the job site with
the Rain-Clik, they donʼt have to worry about forget
-
PRODUCT FEATURES AND BENEFITS (continued)
Soil Type Shut Down "Period"
Sandy 1 Day
Sandy Loam 1-2 Days
Loamy 2 Days
Loamy Clay 2-3 Days
Silt 3 Days
Clay 2-3 Day
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