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Liquiphant FTL41
6
Electrical connection
6.1
Required tool
• Screwdriver for electrical connection
• Allen key for screw of cover lock
6.2
Connecting requirements
6.2.1
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, the cover cannot provide secure sealing.
‣
Open the cover: slacken the screw of the cover lock with a maximum of 2 turns so that the
screw does not fall out. Fit the cover and check the cover seal.
‣
Close the cover: screw the cover securely onto the housing, making sure that the securing
screw is positioned correctly. There should not be any gap between the cover and housing.
13
Cover with securing screw
6.2.2
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.
6.3
Connecting the device
Housing thread
The thread of the electronics and connection compartment is coated with lubricant
varnish.
Avoid additional lubrication.
Endress+Hauser
eff.
AC
4
2 x
0.7 Nm
Electrical connection
A0039520
13
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