Proline Promag W 400
Endress+Hauser 21
The necessary ground cable can be ordered from Endress+Hauser .
Plastic pipe or pipe with insulating liner
This connection method also applies in situations where:
• The customary potential equalization is not used
• Equalizing currents are present
A0016318
11 Potential equalization via ground terminal and ground disks
Note the following when installing:
The ground disks must be connected to the ground terminal via the ground cable and be connected
to ground potential.
Ground cable
Copper wire, at least 6 mm
2
(0.0093 in
2
)
For remote device versions, the ground terminal in the example always refers to the sensor and
not to the transmitter.
The ground cable and ground disks can be ordered from Endress+Hauser (→ 87).
Pipe with a cathodic protection unit
This connection method is only used if the following two conditions are met:
• Metal pipe without liner or pipe with electrically conductive liner
• Cathodic protection is integrated in the personal protection equipment
A0016319
12 Potential equalization and cathodic protection
1 Isolation transformer power supply
2 Electrically isolated from the pipe
3 Capacitor
Ground cable
Copper wire, at least 6 mm
2
(0.0093 in
2
)
1. Connect the measuring device to the power supply such that it is floating in relation to the
protective ground.
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