Endress+Hauser HART Flowmeter Proline 400 Brief Operating Instructions page 32

Electrical connection
Starting conditions:
• The pipe has an insulating effect.
• Low-impedance medium grounding close to the sensor is not guaranteed.
• Equalizing currents through the medium cannot be ruled out.
PE = P
 10 Promag L, W
Promag D
1. Connect flanges to the ground terminal of the transmitter' s or sensor' s connection
housing via the ground cable.
2. Connect the connection to ground potential.
Promag L and W
1. Connect ground disks to the ground terminal of the transmitter' s or sensor' s connection
housing via the ground cable.
2. Connect the connection to ground potential.
5.4.3 Connection example with the potential of the medium not equal to the
protective ground
In these cases, the medium potential can differ from the potential of the device.
Metal, ungrounded pipe
The sensor and transmitter are installed in a way that provides electrical insulation from PE,
e.g. applications for electrolytic processes or systems with cathodic protection.
Starting conditions:
• Unlined metal pipe
• Pipes with an electrically conductive liner
32
= P
P M
A0044856
PE = P
 11 Promag D
Flowmeter Proline 400
= P
P M
A0045824
Endress+Hauser