PROline Promag 23
4 Wiring
Hauser
37
Plastic pipes and isolating lined pipes
Normally, potential is matched using the reference electrodes in the measuring tube.
However, in exceptional cases it is possible that, due to the grounding plan of a system,
large matching currents flow over the reference electrodes. This can lead to destruction
of the sensor, e.g. through electrochemical decomposition of the electrodes. In such
cases, e.g. for fibre-glass or PVC piping, it is recommended that you use additional
ground disks for potential matching (Fig. 26).
Mounting of ground disks
"
Caution:
Risk of damage by electrochemical corrosion. Note the electrochemical insulation
rating, if the ground disks and measuring electrodes are made of different materials.
Please also pay special attention to company-internal grounding concepts.
Fig. 26:
Potential equalisation/ground disks with plastic pipes or lined pipes
Lined pipes (cathodic protection)
In such cases, install the measuring instrument without potential in the piping:
When installing the measuring device, make sure that there is an electrical connection
between the two piping runs (copper wire, 6 mm
2
).
Make sure that the installation materials do not establish a conductive connection to
the measuring device and that the installation materials withstand the tightening tor-
ques applied when the threaded fasteners are tightened.
Also comply with the regulations applicable to potential-free installation.
Fig. 27:
Potential equalisation and cathode protection
1
power supply (unit)
2
electrically insulated
3
external power supply
F06-2xxxx
xxx-04-x
x
-xx-
xx-002
6 mm² Cu
1
2
3
2
F06-2xxxx
xxx-04-xx
-xx-x
x
-003
Содержание PROline promag 23
Страница 4: ...Contents PROline Promag 23 4 Endress Hauser ...
Страница 10: ...2 Identification PROline Promag 23 10 Endress Hauser ...
Страница 30: ...3 Installation PROline Promag 23 30 Endress Hauser ...
Страница 40: ...4 Wiring PROline Promag 23 40 Endress Hauser ...
Страница 52: ...5 Operation PROline Promag 23 52 Endress Hauser ...
Страница 56: ...6 Commissioning PROline Promag 23 56 Endress Hauser ...
Страница 58: ...7 Maintenance PROline Promag 23 58 Endress Hauser ...
Страница 102: ...10 Technical data PROline Promag 23 102 Endress Hauser ...
Страница 106: ...PROline Promag 23 106 Endress Hauser ...