Proline Promag W 400
20 Endress+Hauser
Potential equalization Requirements
Please consider the following to ensure correct measurement:
• Same electrical potential for the fluid and sensor
• Company-internal grounding concepts
• Pipe material and grounding
Connection examples for standard situations
Metal, grounded pipe
A0016315
9 Potential equalization via measuring tube
Connection example in special situations
Unlined and ungrounded metal pipe
This connection method also applies in situations where:
• The customary potential equalization is not used
• Equalizing currents are present
A0016317
10 Potential equalization via ground terminal and pipe flanges
Note the following when installing:
• Connect both sensor flanges to the pipe flange via a ground cable and ground them.
• Connect the connection housing of the transmitter or sensor to ground potential by means of the
ground terminal provided for the purpose.To mount the ground cable:
– If DN ≤ 300 (12"): Mount the ground cable directly on the conductive flange coating of the
sensor with the flange screws.
– If DN ≥ 350 (14"): Mount the ground cable directly on the metal transport bracket.
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.
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