Hydreon RG-9 Manual

Hydreon Rain Gauge Model RG-9
Visit our product page for updated documentation and technical
drawings: ​
w ww.rainsensors.com/rg-9

Installation and Mounting

1. Set DIP switches.
2. Mount the Rain Gauge
Mount the rain Gauge where it gets a clear measurement of
precipitation– away from overhangs, etc. The mounting arm is
designed to fit over a strap 0.75" (19 mm) wide. Two holes 0.25"
(6.35 mm) are placed 0.75" (19 mm) apart. The gland style
connector goes in the bottom hole. Be sure to use wire rated for
outdoor (high-UV) use. For conduit applications, the mounting arm
may be removed, and the wiring hole drilled out using a step drill
to accommodate a ½" EMT compression connector or similar style
of conduit connector.
3. Assemble the Rain Gauge as shown above. The silicone O-ring
fits nicely in the lens groove, but it can fall or slip out during
assembly. After the unit is assembled, visually verify that the
O-ring is properly seated all the way around.

Specifications

Parameter Value
Input Voltage Range 5-16 VDC​ ​ o n J1
Reverse polarity protected to 50V
Alternative
3.3V though pin 8 on J2. Note if this isn't
a stable supply it could induce false
indications or affect accuracy. An
overvoltage to this pin will destroy the
device.
Current Drain 110 μA nominal. (No outputs on, dry not
raining)
2-4 mA when raining
Output NPN Open Collector Output
100 mA / 80V Max
Operating -40°C to +60°C
Temperature range
Rain Gauge Model RG-9 Instructions

LED

The LED in the center of the circuit board turns on at power up
and when OUT is on, as an aid to debugging.
On power up:
3 Flashes => Normal Power Up
4 Flashes => Lens is not very transmissive, but can still run at a
reduced accuracy
5 Flashes => The Lens is not able to get sufficient light through for
reasonable readings, it will still try to run but at a significantly
reduced accuracy. This will also print a LensBad message to the
Serial interface.

J1 Connector

OUT - Open Collector Output, Pulled to ground during rain event
V+ - Input Voltage, 5 - 16 VDC
GND - Ground

J2 Connector

J2 is a pin-field on 0.1" centers, used for Serial communication,
and optionally powering the RG-9.
Connector field is 0.025" square pins on 0.1" centers. An example
compatible connector is Molex part number 22-01-3067. This is
available from Digi-Key as part number WM2004-ND. The
necessary crimp-on wire terminals are Molex 08-55-0131 /
DigiKey WM4591-ND.
J2 Pin assignments
1 - GND, Same as J1 GND
2 - V+ 5-16V, Same as J1 V+
3 - OUT, Same as J1 OUT
4 - Serial OUT
5 - Serial IN
6 -
7 - MCLR
8 - V+ 3.3V
Dip Switches
1 = On, 0 = Off
Switch
Behavior
1 2 3 4
0 0 Sensitivity 1 (Rain Drops)
0 1 Sensitivity 2 (Very Light)
1 0 Sensitivity 4 (Medium)
1 1 Sensitivity 6 (Heavy)
0 0 Monostable Extend - None
0 1 Monostable Extend - 5 min
1 0 Monostable Extend - 10 min
1 1 Monostable Extend - 15 min
Manual for SW rev 1.000