Endress+Hauser Liquiphant FTL41 Brief Operating Instructions page 14

Electrical connection
6.3.1 3-wire DC-PNP (electronic insert FEL42)
• Three-wire DC version
• Switches the load via the transistor (PNP) and separate connection, e.g. in conjunction with
programmable logic controllers (PLC), DI modules according to EN 61131-2
Supply voltage
WARNING
L
Failure to use the prescribed power unit.
Risk of potentially life-threatening electric shock!
‣
The FEL42 may only be powered by power supply units with secure galvanic isolation in
accordance with IEC 61010-1.
U = 10 to 55 V
DC
Comply with the following according to IEC/EN61010-1: provide a suitable circuit
breaker for the device and limit the current to 500 mA, e.g. by installing a 0.5 A fuse
(slow-blow) in the power supply circuit.
Power consumption
P < 0.5 W
Current consumption
I ≤ 10 mA (without load)
The red LED flashes in the event of an overload or short-circuit. Check for an overload or
short-circuit every 5 s.
Load current
I ≤ 350 mA with overload and short-circuit protection
Residual current
I < 100 µA (for blocked transistor)
Residual voltage
U < 3 V (for switched through transistor)
Behavior of output signal
• OK status: switched through
• Demand mode: blocked
• Alarm: blocked
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Liquiphant FTL41
Endress+Hauser