Proline Promag 55 PROFIBUS PA
Wiring
Hauser
53
Preinstalled ground cable for DN
≤
300 (order option)
Ground cables which are preinstalled on the sensor flange, are also available. These ground cables
can be mounted and connected electrically to the piping in different ways:
• Using a screw on the side of the pipe flange (a)
• Using the flange screws (b)
• Using a pipe clip installed around the pipe (c)
a0006117
Fig. 37:
Possibilities for connecting and mounting pre-installed ground cables
(ground cable: copper wire at least 6 mm
2
/10 AWG).
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, 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 fiberglass or PVC piping, it
is therefore
essential
that you use additional ground disks for potential equalization. This applies
also to two-phase or two-component flow, where the fluid is not well mixed or its constituents are
unmixable.
Mounting of ground disks
"
Caution!
• Risk of damage by electrochemical corrosion. Note the electrochemical series if the ground disks
and measuring electrodes are made of different materials.
• Also, observe company-internal grounding guidelines.
a0004377
Fig. 38:
Potential equalization/ground disks in the case of plastic pipes or isolating lined pipes
(ground cable: copper wire at least 6 mm
2
/10 AWG).
a
b
c
