Pe Connection; Connecting The Measuring Device; 2-Wire Ac (Electronic Insert Fel61) - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Liquiphant FTL51B
Endress+Hauser
Electronic insert
2-wire NAMUR > 2.2 mA/< 1.0 mA (FEL68)
For separate switching unit
Signal transmission H-L edge 2.2 to 3.8 / 0.4 to 1.0 mA as per EN 50227 (NAMUR)
on two-wire cabling.
2-wire density (FEL60D) for density measurement
1) Ordering information: Product Configurator, order code for "Output"
2) Ambient temperature –60 °C (–76 °F) optionally available for order. The low-temperature electronic
inserts are marked LT.
3) Ambient temperature –52 °C (–62 °F) optionally available for order. The low-temperature electronic
inserts are marked LT.
6.1.1

PE connection

The device' s PE connection only needs to be connected if the operating voltage of the
device is ≥ 35 V DC or ≥ 16 V AC eff.
When the device is used in hazardous areas, it must always be included in the potential
equalization of the system, irrespective of the operating voltage.
6.2

Connecting the measuring device

6.2.1

2-wire AC (electronic insert FEL61)

• Two-wire AC version
• Switches the load directly into the power supply circuit via an electronic switch. Always
connect in series with a load.
• Functional testing without level change. Functional testing of the entire device can be
performed using the test button on the electronic insert or with the test magnet with the
housing closed.
Supply voltage
19 to 253 V
AC
Residual voltage when switched through: maximum 12 V
In accordance with IEC/EN61010 a separate circuit breaker must be provided for the
device.
Power consumption
< 1W
Current consumption
Residual current in the blocked state: maximum 3.8 mA
The red LED flashes in the event of an overload or short-circuit. Check for an overload or
short-circuit every 5 seconds. The test is deactivated after 60 seconds.
Load current
Maximum 89 VA / 253 V (350 mA); maximum 8.4 VA / 24 V (350 mA)
Minimum 2.5 VA / 253 V (10 mA); minimum 0.5 VA / 24 V (20 mA)
With overload and short-circuit protection.
Electrical connection
1)
Description Option
3)
→  31 A8
→  32 GA
19