Connecting The Measuring Device - Endress+Hauser Liquiphant FTL41 Brief Operating Instructions

Vibronic point level switch in liquids

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Liquiphant FTL41

5.4

Connecting the measuring device

5.4.1

3-wire DC-PNP (electronic insert FEL42)

• Three-wire direct current version

• Switches the load via the transistor (PNP) and separate connection, e.g. in conjunction with

programmable logic controllers (PLC), DI modules as per EN 61131-2

Supply voltage

WARNING

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

Observe the following as per 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

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

Endress+Hauser

Electrical connection

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