elsner elektronik R 24 V User manual

R 24 V
Rain Sensor
Technical specifications and installation instructions
Item number 30158
T echnical support: +49 (0) 70 33 / 30 945-250
EN
Elsner Elektronik GmbH Control and Automation Engineering
Sohlengrund 16
75395 Ostelsheim Phone [phone] / 30 945-0 [email protected]
Germany Fax [phone] www.elsner-elektronik.de

2 Description
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
1. Description
The R 24 V rain sensor signals precipitation (rain, snow) via a 24 V DC output.
Functions:
•Heatedprecipitation sensor (1.2 watts): No error measurement with dew or
mist, fast drying after the rain ends
•Outlet for rain signal (24 V DC)
• Holding time for rain signal adjustable (potentiometer in the device, 10...300 s)
1.1. Technical specification
The product conforms with the provisions of EU directives.
2. Installation and commissioning
2.1. Installation notes
Installation, testing, operational start-up and troubleshooting should
only be performed by an electrician.
CAUTION!
Live voltage! 
There are unprotected live components inside the device.
• National legal regulations are to be followed.
• Ensure that all lines to be assembled are free of voltage and take
precautions against accidental switching on.
Housing Plastic
Colour White / Translucent
Assembly Surface mount
Protection category IP 44
Dimensions approx. 96 × 77 × 118 (W × H × D, mm)
Ambient temperature Operation -30…+50°C, storage -30…+70°C
Operating voltage 24 V DC
Cable cross-section Solid conductor up to 0.8 mm²
Power consumption 60 mA
Rain sensor heater approx. 1.2 W
"Rain" output 24 V DC
Relay capacity 5 A

3 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
• Do not use the device if it is damaged. 
• Take the device or system out of service and secure it against
unintentional use, if it can be assumed, that risk-free operation is no
longer guaranteed.
The device is only to be used for its intended purpose. Any improper modification or
failure to follow the operating instructions voids any and all warranty and guarantee
claims.
After unpacking the device, check it immediately for possible mechanical damage. If it
has been damaged in transport, inform the supplier immediately.
The device may only be used as a fixed-site installation; that means only when assem-
bled and after conclusion of all installation and operational start-up tasks and only in
the surroundings designated for it.
Elsner Elektronik is not liable for any changes in norms and standards which may occur
after publication of these operating instructions.
2.2. Location
Select an assembly location at the building where precipitation may be collected by the
sensor unobstructedly. Do not assemble any construction components above the sen-
sor from where water may drop on to the rain sensor after it has stopped raining or
snowing.
At least 60 cm of clearance must be left all round the device. Concurrently, the prevents
spray (raindrops hitting the device) or snow (snow penetration) from impairing the
measurement. It also does not allow birds to bite it.
Fig. 1
There must be at least 60 cm of space below,
to the sides and in front of the rain sensor left
from other elements (structures, construction
parts, etc.).
60 cm

4 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
2.3. Sensor assembly
2.3.1. Attaching the mount
The sensor comes with a combination wall/pole mount. The mount comes adhered by
adhesive strips to the rear side of the housing. Fasten the mount vertically onto the wall
or pole.
Fig. 2
The rain sensor must be mounted onto a ver-
tical wall (or pole).
Wall
or
pole
Fig. 3
The rain sensor must be mounted horizontal-
ly in the lateral direction.
Horizontal
Fig. 4
When wall mounting: flat side on wall, crescent-
shaped collar upward.
Collar

5 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
Fig. 5
When pole mounting: curved side on pole, collar
downward.
Collar
Fig. 6
Different mounting arms are available from Els-
ner Elektronik as additional, optional accessories
for flexible installation of the weather station on
a wall, pole or beam (pictures of sensors exem-
plary).
Example of the use of a mounting arm: Due to
flexible ball joints, the sensor can be brought
into ideal position.
Fig. 7
Example use of the hinge arm mounting:
With the hinge arm mounting, the weather sta-
tion projects from beneath the roof overhang.
Sun, wind and precipitation can act upon the
sensors without hindrance.
Fig. 8
Example use of the hinge arm mounting:
Fitting to a pole with worm drive hose clips

6 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
2.3.2. View of rear side and drill hole plan
Langloch 7,5 x 5 mm
Fig. 9 a+b
Drill hole plan
Dimensions of rear side of
housing with bracket. Sub-
ject to change for technical
enhancement.

7 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
2.3.3. Preparing the sensor
The lid of the R 24 V with the rain sensor latches into place on the lower edge to the
right and left (see Fig.). Remove the lid. Proceed carefully to avoid tearing off the cable
connection between the circuit board in the lower section and the rain sensor in the
lid (cable with plug).
Guide the ead through the rubber seal on the underside of the housing and connect the
supply voltage and the output to the terminals provided for this purpose.
The lead must be plugged in between the lid and circuit board.
2.3.4. Layout of the circuit board
Fig. 10
1 Lid notches
2 Bottom of housing
1
2
Unclip the lid and
take it off from the top
Fig. 11: Overview of the circuit
board
1 Contact for operating

voltage (24 V DC) and 
rain signal
1: +24 V

2: GND 
3: Rain +24 V DC
Connecting plug suitable
for solid conductors
up to 0.8 mm².
2 Socket connection to the
housing cover with rain

sensor
3 Potentiometer hold time rain
signal (10-300 seconds)
1
2
3

8 Installation and commissioning
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
2.3.5. Mounting the sensor
Close the housing by putting the cover back over the bottom part. The cover must snap
in on the left and right with a definite “click”.
To remove it, the sensor can be simply pulled upwards out of the mount, against the
resistance of the fastening.
2.4. Notes on mounting and commissioning
Do not open the device if water (rain) might ingress: even some drops might damage
the electronic system.
Observe the correct connections. Incorrect connections may destroy the sensor or con-
nected electronic devices.
After mounting, remove all transport protection labels.
2.5. Setting the holding time
The holding time defines how long the rain signal is maintained after no precipitation
has been detected (switch delay).
The holding time is set using a potentiometer on the inside of the housing. Turning
anti-clockwise reduces the holding time (minimum value 10 seconds). Turning clock-
wise increases the holding time (maximum value 300 seconds).
Fig. 12
Make sure the cover and bottom part are
properly snapped together! This picture is
looking at the closed sensor from under-
neath.
Fastening
Fig. 13
Push the housing from above into the fas-
tened mount. The bumps on the mount must
snap into the rails in the housing.

9 Maintenance
R 24 V rain sensor • Version: 03.03.2016 • Technical changes and errors excepted.
3. Maintenance
WARNING!
Risk of injury caused by components moved automatically!
The automatic control can start system components and place people in 
danger (e.g. moving windows/awnings if a rain/wind alarm has been
triggered while cleaning).
• Always isolate the device from the mains for servicing and cleaning.
The device must regularly be checked for dirt twice a year and cleaned if necessary. In
case of severe dirt, the sensor may not work properly anymore.
ATTENTION
The device can be damaged if water penetrates the housing.
• Do not clean with high pressure cleaners or steam jets.