OPERATION MANUAL
Rain Detector DRD-12V
Connection
After removing the sensor cover, the control cable is to be inserted in
the cable gland M16.
Supply voltage is to be connected to the terminals VCC and GND.
Terminals NC, COM, NO are the potential free changeover contacts
for switching.
Precautions:
• The device is suitable only for low voltages and should not be
operated on mains supply !
• The relay contact is only suitable for low value signals and
should not come in contact with mains supply !
• The protection type is valid only with an intact, complete casing,
cover screws and cable gland properly tightened, and the cover-
gasket should always be available on the sensor cover !
• The suitability for certain applications is to be checked by the
user
Settings
Signal generator output (optional)
At the connection terminals (Pin BUZ and GND) a passive Piezo
signal generator can be connected. The condition of signal (acustic
signal for dry or wet) can be selected with the plug links S1-S2 or
S2-S3. In the default-position S2-S3, the signal generator is inactive
for rain.
Switching mode
The switching mode of the relay (pickup or dropout with rain) can be
selected with the plug links T1-T2 or T2-T3. In the factory settings,
link T1-T2 is connected and the relay closes if the sensor surface
gets wet.
Heating
The sensor surface is heated, if the link of HZ1-HZ2 is connected. To
ensure faster drying and for operation below freezing point, the
heater should be switched on. For sensing fog, the heater can be
switched off.
Sensitivity setting
The sensitivity for detecting rain can be adjusted with the potentiometer
“SENS”. Rotating the potentiometer clockwise results a higher sensitivity
For direction rain mostly the middle position of the potentiometer is suitable
Please note that no function takes place in the end position!
Indicators
There is a green LED on the device to indicate the operation status
and a red LED to indicate the switch position (meansrelay contact
closed).
Maintenance
The Rain Sensor unit is almost maintenance free. The sensor surface
must be occasionally cleaned with a moist cloth ( e.g. once annually,
depending on the place of installation). In case of persistent condi-
tion, even if it does not rain, it triggers due to strong contamination.
Connection Layout
REL NC
Opening switch contact
REL NO
Closing switch contact
REL CO
Common switch contact
AC/DC
Operating voltage AC or 24 V DC +10%
AC/GND
Operating voltage AC or 0 V
1
Switch mode signal generator (dry)
2
Common contact to S3 and S1
3
Switch mode signal generator (wet)
4
Signal generator ground
5
Signal generator output
6
Switch mode relay (dry)
7
Common contact to T3 and T1
8
Switch mode relay (wet)
9
Heating
10
Heating
11-16 not occupied
Dimensions
Attention
Please avoid extreme mechanical and inappropriate exposure.
The device/product is not suitable for potential explosive areas and
medical-technical applications.
issueC/20220
908
/V
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