…5 Installation
Grounding
The sensor must be cross-bonded to the upstream and
downstream pipes. For technical reasons, this potential must be
identical to the potential of the metering fluid. The fluid connection
is made by installing 2 fluid contact rings (for grounding).
IMPORTANT NOTE
• Connect the transmitter ground connection to the
sensor body ground – see Operating Instruction
OI/FET400 - EN.
• The sensor must not be connected to a ground spike.
•
2
(<10AWG) cable.
Fluid contact rings for
grounding for lined pipes
Figure 34 Cross-bonding – all flanged pipes
Fluid contact rings
for grounding
Figure 35 Cross-bonding – flange adapter
Metal pipe Plastic pipeFluid contact rings
(for grounding)
Figure 36 Cross-bonding – plastic pipe insert
Cathodic-protected systems
CAUTION
The grounding arrangement shown in Figure 37 is
applicable only to:
• cathodic protected installations
• installations where E2 and E3 are different to E1
Do not ground cathodically-protected pipelines to an
external earth.
Incorrect installation will result in fault currents flowing
through the meter resulting in unstable readings.
E
1
E
2
E
1
E
3
>50D >50D
Conductive
pipe
Insulator Insulator
Cathodic Potentials E1
MUST be Equal
Figure 37 Cathodic-protected installations with different
cathodic potential generator
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