Endress+Hauser Proline Promag L 400 - Ensuring Potential Equalization

Proline Promag L 400 PROFIBUS DP Electrical connection
Endress+Hauser 41
7.2.3 Ensuring potential equalization
L
CAUTION
Electrode damage can result in the complete failure of the device!
‣
Make sure that the fluid and sensor have the same electrical potential.
‣
Pay attention to internal grounding concepts in the company.
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Pay attention to the pipe material or grounding.
Connection examples for standard situations
Metal, grounded pipe
A0016315
 15 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
Ground cable
Copper wire, at least6 mm
2
(0.0093 in
2
)
DN 300≤ DN 350≥
A0016317
 16 Potential equalization via ground terminal and pipe flanges
1. Connect both sensor flanges to the pipe flange via a ground cable and ground them.
2. 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. Observe torques (→  24).
3. Connect the connection housing of the transmitter or sensor to ground potential by
means of the ground terminal provided for the purpose.
For remote device versions, the ground terminal in the example always refers to the
sensor and not to the transmitter.