M10
Instruction Manual
32
4.6.3 Electrical grounding of the meter
The purpose of grounding is to protect the system from external electromagnetic interference and to set
the measurement reference of the meter. To achieve this requirement, a clean earth connection with the
lowest possible resistance is required. We recommend using at least one ≥ 4mm² / AWG11 cable to make
the grounding connections. If the liquid is not electrically connected to the pipes (in plastic or with internal
coating) grounding rings are required. Absent or incorrect grounding will result in erratic measurement or
unpredictable failure (Fig. 41).
The sensor must always be grounded! An incorrect grounding may lead to an incorrect measurement.
GROUNDING CABLE: Minimum section 2.5 mm² (recommended: 4 mm²), grounding screws M5. Recommended
ground resistance value is ≤ 5
The flowmeter is equipped with a grounding electrode (third electrode). In the case of plastic or coated
pipes, we recommended the use of ground rings.
Earthing rings can be used on both ends of the pipes. The earthing rings are indispensable in the case
of plastic or coated metal pipes to ensure good potential compensation. Earthing rings are supplied on
request. Refer to the images on the following pages for more information.
4.6.3.1
Plastic Pipe Installation using Grounding Rings
Fig. 41
grounding rod
PLASTIC PIPES
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