Electrical Connection; Connection Conditions; Cover With Securing Screw; Connecting Protective Earth (Pe) - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Liquiphant FTL51B
Endress+Hauser
6

Electrical connection

6.1

Connection conditions

6.1.1

Cover with securing screw

Covers with a securing screw are available for devices for use in hazardous areas. Do
not release the screw fully.
 18 Cover with securing screw
6.1.2

Connecting protective earth (PE)

The protective earth conductor at the device must only be connected if the device' s
operating voltage is ≥ 35 V
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.
The plastic housing is available with or without an external protective earth
connection (PE).
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
A functional test can be performed on the device using the test button on the electronic
insert.
Supply voltage
U = 19 to 253 V
AC
Residual voltage when switched through: maximum 12 V
Pay attention to the following as per IEC/EN61010-1: Provide a suitable circuit
breaker for the device, and limit the current to 1 A, e. g. by installing a 1 A fuse (slow-
blow) in the line (not the neutral wire) of the supply circuit.
Power consumption
P ≤ 2 VA
or ≥ 16 V eff.
DC AC
Electrical connection
A0039520
17