Endress+Hauser Proline Promag W 800 - Page 55

Proline Promag W 800 Electrical connection
Endress+Hauser 55
The following requirements must be observed to ensure correct, trouble-free
measurement:
• The principle that the medium, the sensor and the transmitter must be at the same
electrical potential applies.
• Take in-company grounding guidelines, materials and the grounding conditions and
potential conditions of the pipe into consideration.
• The necessary potential equalization connections must be established using a ground
cable with a minimum cross-section of 6 mm
2
(0.0093 in
2
) and a cable lug.
• In the case of remote device versions, the ground terminal in the example always refers
to the sensor and not to the transmitter.
You can order accessories such as ground cables and ground disks directly from
Endress+Hauser →  94
Abbreviations used
• PE (Protective Earth): potential at the protective earth terminals of the device
• P
P
(Potential Pipe): potential of the pipe, measured at the flanges
• P
M
(Potential Medium): potential of the medium
Connection examples for standard situations
Unlined and grounded metal pipe
• Potential equalization is via the measuring pipe.
• The medium is set to ground potential.
Starting conditions:
• Pipes are correctly grounded on both sides.
• Pipes are conductive and at the same electrical potential as the medium
PE = P P=
P M
A0044854
‣
Attach the connection housing of the transmitter or sensor to ground potential by
means of the ground terminal provided for this purpose.
Metal pipe without liner
• Potential equalization is via the ground terminal and pipe flanges.
• The medium is set to ground potential.
Starting conditions:
• Pipes are not sufficiently grounded.
• Pipes are conductive and at the same electrical potential as the medium