KROHNE OPTIFLUX 2000-4000-5000-6000-7300-IFC 300 Ex EN - Manual (Page 29)

CONNECTION DIAGRAMS FOR FIELD VERSIONS
3
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OPTIFLUX
www.krohne.com 07/2010 - 7309482600 - AD EX IFC 300 R06 en
3.3 Equipotential bonding
• As the Ex ia electrode circuits of the flow sensors are effectively grounded through the
conductive liquid in the measuring tube, an equipotential bonding system must exist over the
whole area in which the electrode circuits, including their wiring, are installed, conform EN
60 079-14 clause 12.2.4.
• The flowmeters OPTIFLUX 2000, 4000, 5000 and 6000, the electrode cable and the IFC 300 F
signal converter must all be included in the equipotential bonding system of the hazardous
area. If a single separate conductor is used for equipotential bonding, than this conductor
must have a cross section of at least 4 mm
2 copper.
• The separate equipotential bonding conductor between flowmeter and converter can be left
out, if by other means (e.g. over bonding conductors over the metal piping system) a high
level of assurance that potential equalization exists between flowmeter and converter is
reached.