Operating Manual Smart Weather Sensor
26 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
Figure 6: Connections
8 Connections
There is an 8 pole screw connector on the underside of the equipment. This serves to
connect the supply voltage and interfaces by way of the supplied connection cable.
Equipment connector:
View on sensor connection
Pin assignment:
1 White Supply voltage ground and (SDI12_GND for device version > 41)
2 Brown Positive supply voltage
3 Green RS485_A (+) or (SDI-12 GND for device version < 42)
4 Yellow RS485_B (-) or SDI-12 Data Line
5 Grey External Sensor a
6 Pink External Sensor b
7 Blue Heating voltage ground
8 Red Positive heating voltage
The cable marking is in accordance with DIN 47100.
Note: The yellow protective cap must be removed before plugging in the equipment.
If the equipment is not connected correctly
- It may not function
- It may be permanently damaged
- The possibility of an electrical shock may exist
The supply voltage and the heating voltage are protected against polarity reversal.
Note: When operating the Smart Weather Sensor in SDI12 mode, line 3 (green) shall be
connected only if the SDI12 logger is DC-isolated from the supply voltage of the device. If
signal ground (SDI-12-GND) of the data logger and power supply ground are identical, only
the SDI12-Data-Line (line 4, yellow) may be connected.
Note for SDI12 operation of devices starting from device version 42 or 51 (WS700): If
data logger and device supply voltage are DC-isolated the signal ground (SDI12_GND) must
be connected to line 1 (white). Line 3 (green) shall not be connected. (see SDI12
connection drawings in chapter 19.6)
8.1 Supply Voltage
The supply voltage for the Smart Weather Sensor is 12 - 24V DC. The power supply unit
used must be approved for operation with equipment of protection class III (SELV).
Starting with device version 037 the Smart Weather Sensor has an extended supply voltage
range of 4 … 32V DC. Operation with a supply voltage of 24V is recommended. Limitations
apply in case of supply voltages lower than 12V (see below).
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