Liquiphant M FTL51C
6 Endress+Hauser
Electronic insert FEL51 (AC 2-wire)
Power supply Supply voltage: AC 19 to 253 V
Power consumption: < 0.83 W
Residual current consumption: < 3.8 mA
Short-circuit protection
Overvoltage protection FEL51: overvoltage category III
Electrical connection Two-wire AC connection
Output signal
Signal on alarm Output signal on power failure or in the event of damaged sensor: < 3.8 mA
Connectable load • Voltage drop via FEL51
12 V
• Residual current if electrical switch is blocked: 3.8 mA
• Load switched directly into the power supply circuit via the thyristor.
Transient (40 ms)
1.5 A, 375 VA at 253 V or 36 VA at 24 V (not short-circuit-proof)
The load is switched via an electronic switch directly in the power circuit.
Always connect in series with a load!
Not suitable for connection to low-voltage PLC inputs!
Switches the load directly into the power supply
circuit via an electronic switch.
Always connect in series with a load!
Check the following:
• The residual current in blocked state
(up to 3.8 mA)
• That for low voltage
– the voltage drop across the load is such that
the minimum terminal voltage at the
electronic insert (19 V)
when blocked is not undershot.
– the voltage drop across the electronics when
switched through is observed (up to 12 V)
• That a relay cannot de-energize with holding
power below 3.8 mA.
If this is the case, a resistor should be
connected parallel to the relay. An RC module is
available under the part number: 71107226
• When selecting the relay, pay attention to the
holding power / rated power (see "Connectable
load")
L00-FTL5xxxx-04-05-xx-en-007
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