PROline Promag 23
4 Wiring
Hauser
35
4.2
Potential equalisation
4.2.1
Standard case
Perfect measurement is only ensured when the medium and the sensor have the same
electrical potential. Most Promag sensors have a standard installed reference electrode
which guarantees the required potential matching. This usually means that additional
potential matching measures are unnecessary.
Promag P:
Reference electrode is standard for electrode materials 1.4435, Alloy C-22 and
tantalum.
Reference electrode is optional for electrode material Pt/Rh.
Promag H:
No reference electrode. The metallic process connection provides a permanent
electrical connection to the fluid.
If the process connections are made of a synthetic material, ground rings have to be
used to ensure that potential is equalised (see Page 26). Ground rings are accesso-
ries which must be ordered separately
!
Note:
For installation in metal pipes, it is advisable to connect the ground terminal of the trans-
mitter housing to the piping. Please also pay special attention to company-internal
grounding concepts.
Fig. 24:
Potential equalisation by means of the transmitter's ground terminal
"
Caution:
For sensors without reference electrodes or without metal process terminals, carry out
potential equalisation as per the instructions for special cases described below. These
special measures are particularly important when standard grounding practice cannot
be ensured or extremely strong matching currents are expected.
F
0
6
-2
x
xxxx
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4
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-0
0
0
Summary of Contents for PROline promag 23
Page 4: ...Contents PROline Promag 23 4 Endress Hauser ...
Page 10: ...2 Identification PROline Promag 23 10 Endress Hauser ...
Page 30: ...3 Installation PROline Promag 23 30 Endress Hauser ...
Page 40: ...4 Wiring PROline Promag 23 40 Endress Hauser ...
Page 52: ...5 Operation PROline Promag 23 52 Endress Hauser ...
Page 56: ...6 Commissioning PROline Promag 23 56 Endress Hauser ...
Page 58: ...7 Maintenance PROline Promag 23 58 Endress Hauser ...
Page 102: ...10 Technical data PROline Promag 23 102 Endress Hauser ...