Electrical Connection; Connection Conditions; Connecting The Measuring Device - Endress+Hauser Liquiphant FTL51B Brief Operating Instructions

Electrical connection

5 Electrical connection
5.1

Connection conditions

5.1.1 Cover with securing screw
In the case of devices for use in the hazardous area with a certain type of protection, the cover
is sealed by a securing screw.
NOTICE
If the securing screw is not positioned correctly when the cover is screwed closed, the
cover cannot provide secure sealing.
‣
Before unscrewing the cover, make sure that the securing screw does not protrude too far
over the edge of the cover. Loosen the securing screw with a maximum of 2 turns.
‣
Pay attention to the position of the securing screw when screwing the cover closed.
 15 Cover with securing screw
5.1.2 Connecting protective earth (PE)
The protective earth conductor at the device must only be connected if the device' s operating
voltage is ≥ 35 V or ≥ 16 V
DC
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). If the operating voltage of the electronic insert is < 35 V, the plastic housing has no
external protective earth connection.
5.2

Connecting the measuring device

5.2.1 Required tools
Flat blade screwdriver
16
2 x
eff.
AC
Liquiphant FTL51B
A0039520
Endress+Hauser