Gb 6. commissioning, operation – WIKA LH-10 User Manual
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WIKA operating instructions submersible pressure transmitter, model LH-10
14075011.01 08/2013 GB/D/F/E
GB
6. Commissioning, operation
6.2.2 Pin assignment
Cable outlet
2-wire
3-wire
U
+
brown
brown
U-
green
green
S
+
-
white
Shield
grey
grey
6.2.3 Setting up a voltage supply
The power supply for the pressure transmitter must be made via an energy-limited electrical circuit in accordance with
section 9.3 of UL/EN/IEC 61010-1, or an LPS to UL/EN/IEC 60950-1, or (for North America) class 2 in accordance with
UL1310/UL1585 (NEC or CEC). The power supply must be suitable for operation above 2,000 m should the pressure
transmitter be used at this altitude.
■
Power supply
The power supply depends on the selected output signal.
4 ... 20 mA:
DC 10 ... 30 V
0 ... 20 mA:
DC 10 ... 30 V
DC 0 ... 5 V:
DC 10 ... 30 V
DC 0 ... 10 V:
DC 14 ... 30 V
DC 0.5 ... 2.5 V: DC 5 ... 30 V (suitable for battery operation)
■
Load in Ω
Current output (2-wire): ≤ (power supply - 10 V) / 0.02 A - (cable length in m x 0.14 Ω)
Current output (3-wire): ≤ (power supply - 3 V) / 0.02 A - (cable length in m x 0.14 Ω)
Voltage output (3-wire): > 100 kΩ
6.3 Functional check
The output signal must be proportional to the prevailing pressure. If this is not the case, this may indicate a damaged
diaphragm. In this case, see chapter 8 “Faults”.