Users Manual

Operating Manual Smart Weather Sensor
30 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 (through 2.5A fuse where required)*
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 (WS100-UMB only: impulse output Uout)
6 Pink External Sensor b (WS100-UMB only: not connected)
7 Blue Heating voltage ground
8 Red Positive heating voltage (through 2.5A fuse where required)*
The cable marking is in accordance with DIN 47100.
*) WS100/400/600/700/800-UMB: Supply voltage and heating voltage shall be protected
by a fuses 2.5A (fine) each.
The cable shielding shall be connected to earth in the electrical cabinet.
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) and
all WS100: 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)