Endress+Hauser Liquiphant FTL51B - 2-Wire NAMUR Connection (FEL68)

Liquiphant FTL51B Electrical connection
Endress+Hauser 27
Connectable load
Loads switched via 2 potential-free changeover contacts (DPDT)
• I
AC
≤ 6 A (Ex de 4 A), U~ ≤ AC 253 V; P~ ≤ 1 500 VA, cos φ = 1, P~ ≤ 750 VA, cos φ > 0.7
• I
DC
≤ 6 A (Ex de 4 A) to DC 30 V, I DC ≤ 0.2 A to 125 V
According to IEC 61010, the following applies: Total voltage from relay outputs and power
supply ≤ 300 V
Preferably use electronic insert FEL62 DC PNP for small DC load currents, e.g. connection to a
PLC.
Relay contact material: silver/nickel AgNi 90/10
When connecting a device with high inductance, provide spark quenching to protect the relay
contact. A fine-wire fuse (depending on the connected load) protects the relay contact in the
event of a short-circuit.
Behavior of output signal
• OK status: relay energized
• Demand mode: relay de-energized
• Alarm: relay de-energized