Wiring Promag 53 PROFIBUS DP/PA
62 Endress+Hauser
4.4 Potential matching
#
Warning!
The measuring system must be included in potential equalization.
Perfect measurement is only ensured when the medium and the sensor have the same
electrical potential. Most Promag sensors have a reference electrode installed as standard,
which guarantees the required potential equalization.
The following must also be taken into account for potential equalization:
• Company-internal grounding guidelines
• Operating conditions such as material/grounding of piping etc. (see table)
4.4.1 Potential equalization, Promag E/L/P/W
Reference electrode available as standard
4.4.2 Potential equalization, Promag H
No reference electrode available!
There is always one electrical connection to the fluid via the metallic process connection.
"
Caution!
When using process connections made of plastic, potential equalization must be guaranteed
through the use of grounding rings → 24.
The necessary grounding rings may be ordered separately as an accessory from
Endress+Hauser (→ 128).
4.4.3 Connection examples for potential equalization
Standard case
Operating conditions Potential equalization
When using the measuring device in:
• metallic, grounded piping
Potential equalization is carried out via the ground terminal
of the transmitter.
!
Note!
For installation in metal pipes, it is advisable to connect the
ground terminal of the transmitter housing to the piping.
A0011892
Fig. 37: Via the transmitter's ground terminal
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