Ground; General Information On Ground Connections; Metal Pipe With Fixed Flanges - ABB FSM4000 Instrucciónes De Puesta En Marcha

Mounting
3.7

Ground

3.7.1

General information on ground connections

Observe the following items when grounding the device:
• Use the supplied green-yellow cable as a ground wire.
• Connect the ground screw for the flowmeter sensor (on flange and transmitter housing) to
the station ground.
• The connection box must also be grounded.
• For plastic pipes or pipes with insulating lining, the ground is provided by the grounding plate
or grounding electrodes.
• When stray potentials are present, install a grounding plate at the front and back of the
flowmeter sensor.
• For measurement-related reasons, the potentials in the station ground and in the pipeline
should be identical.
• An additional ground via the terminals is not required.
Important
If the flowmeter sensor is installed in plastic or earthenware pipelines, or in pipelines with an
insulating lining, transient current may flow through the grounding electrode in special cases.
In the long term, this may destroy the flowmeter sensor, since the ground electrode will in turn
degrade electrochemically. In these special cases, the connection to the ground must be
performed using grounding plates.
3.7.2

Metal pipe with fixed flanges

1. Insert M6x12 threads (2) in the flanges for the pipeline and the flowmeter sensor.
2. Secure the ground straps (1) with screw, spring washer, and shim as shown in the figure.
3. Use a copper wire (minimum 2.5 mm² (14 AWG)) to establish a connection between the
ground connection of the flowmeter sensor and an appropriate grounding point.
Fig. 19
20 - EN
1
2
Flange design
FSM4000
Wafer design
G00530
D184B141U03