Mode 0: Tipping Bucket
Rain Gauge emulates a tipping bucket of the
specified size.
Switch
Behavior
7 6 5 4 3 2 1
0 0 0 X 0 0 0 Bucket Size = 0.01”
0 0 1 Bucket Size = 0.001” (Sensitive)
0 1 0 Bucket Size = 0.0001” (Very sensitive)
1 0 0 Bucket Size = 0.2 mm
1 0 1 Bucket Size = 0.01 mm (sensitive)
1 1 0 Bucket Size = 0.001 mm (Very sensitive)
1 1 1 1 Reserved for system test
In tipping bucket mode, the Rain Gauge effectively emulates a tipping
bucket of the specified size. For example, if the DIP switches are set
to a tipping bucket mode with a bucket size of 0.01", then the output
will pulse ON for 50mS each time 0.01" of water accumulates, just as
a tipping bucket would. This can be externally totalized, and used to
measure rainfall rates. Bucket sizes of 0.001" and 0.0001" are
similar, generating pulses at accumulations of one one-thousandth,
and one ten-thousands of an inch, respectively. These emulate what
a tipping bucket would do if it were possible to make one that small.
Metric bucket sizes are available as well, or the Inch unit scales may
be scaled with external equipment.
Accuracy
We do not claim an accuracy spec for the RG-11. For more
information see the “Tipping Bucket” link on www.rainsensors.com.
Mode 1: It's Raining
Rain Gauge turns on the relay to indicate that it is
raining when the rainfall has reached a given
intensity.
Switch
Function
7 6 5 4 3 2 1
0 0 1 X X 0 0 Very sensitive-- first detected raindrop.
0 1 Sensitive-- turn on with very light rainfall
(0.1” per hour ).
1 0 Medium Sensitivity-- turn on with medium
rain (0.25” per hour. You would want your
car's wipers on steady slow)
1 1 Low Sensitivity-- turn on in heavy rainfall. (1”
per hour. You would want your car's wipers
on high)
X 0 X X Output off when rain stops.
1 Output Monostable Extended by 15 minutes
0 X X X No Dark-Detect - Normal operation
1 Dark Detect
Use this mode to control equipment that should be controlled,
enabled, open, closed, and so forth depending on whether or not it is
raining. The output turns on when a given rate of rainfall is detected,
and turns off after it has dropped below a threshold.
Each of the sensitivity levels (set by switches 1 and 2) provides
different trip and release points. There is much hysteresis built in, but
real rain fall rates typically fluctuate, even in what you may perceive
as a “steady rain”, so expect the output to turn on and off. The output
will remain on for between about 30 seconds and 5 minutes after the
last detected rain drop, depending on sensitivity setting and actual
conditions.
Monostable Extend = Switch 3 ON
To prevent some piece of equipment from turning constantly on and
off (or opening / closing, etc.) you can enable the Monostable extend
(Switch 3). That will hold the output on for 15 minutes after the rain
has ceased.
Dark Detect = Switch 4 ON
If this enabled, the output will also turn on when the ambient light
drops below about 2000 lux. This feature may be used to retract a
sun-shade awning when it is dark.
Rain Gauge Model RG-11 Instructions PN 55-005-100 Manual for SW rev 016
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