Wiring Proline Promag 53 MODBUS RS485
50 Endress+Hauser
Special cases
Operating conditions Potential equalization
When using the measuring device in:
• metallic, ungrounded piping
This type of connection occurs when:
• the usual potential equalization cannot be guaranteed
• extremely high equalizing currents are expected
A ground cable (copper wire, at least 6 mm² (0.0093 in
2
)) is used
to connect both sensor flanges to the respective pipe flange and
ground them. Connect the transmitter or sensor connection
housing, as applicable, to ground potential by means of the
ground terminal provided for the purpose.
The installation of the ground cable depends on the nominal
diameter:
•DN ≤ 300 (12"): The ground cable is in direct connection
with the conductive flange coating and is secured by the
flange screws.
•DN ≥ 350 (14"): The ground cable connects directly to the
metal transport bracket.
!
Note!
The ground cable for flange-to-flange connections can be
ordered separately as an accessory from Endress+Hauser.
A0011893
Fig. 33: Via the transmitter's ground terminal
and the pipe flanges
When using the measuring device in:
• Plastic pipes
• Isolating lined pipes
This type of connection occurs when:
• the usual potential equalization cannot be guaranteed
• extremely high equalizing currents are expected
Potential equalization takes place using additional ground disks,
which are connected to the ground terminal via a ground cable
(copper wire, min. 6 mm² (0.0093 in
2
)). When installing the
ground disks, please comply with the enclosed Installation
Instructions.
A0011895
Fig. 34: Via the transmitter's ground terminal
and the optionally available ground
disks
When using the measuring device in:
• pipes with cathodic protection
The device is installed in the pipeline in such a way that it is
potential-free.
Using a ground cable (copper wire, min. 6 mm² (0.0093 in
2
)),
only the two pipe flanges are connected. When doing so, the
ground cable is mounted directly on the conductive flange
coating using flange screws.
Please note the following during installation:
• The relevant regulations for potential-free installations must
be observed.
• There must not be an electrically conductive connection
between the piping and the device.
• The mounting material must be able to withstand the relevant
torques.
A0011896
Fig. 35: Potential equalization and cathodic
protection
1 Isolation transformer power supply
2 Electrically isolated
DN 300 DN 350
1
2
2
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