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VTX3
4.1 General notes
The separate intrinsically safe signal circuits are electrically connected in the terminal
compartment of the signal converter. The circuits are designed in protection type "intrinsically
safe" and galvanically isolated from ground (test voltage ≥ 500 V
The intrinsically safe flow sensor circuits are connected in the connection boxes on the wall
bracket and on the flow sensor.
The connecting cables should be selected according to the applicable installation standards
(e.g. EN 60079-14) and the maximum operating temperature.
The connecting cable between the flow sensor and the wall bracket for remote versions is part of
the supply.
• The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
• All cores that are not used must be securely connected to the ground potential of the
hazardous area or carefully insulated against each other and against ground (test voltage
≥ 500 V
• Lay cables so as to ensure that there is sufficient distance between surfaces of the flow
sensor and the connecting cable.
• Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(protection category) IP66/67 according to EN 60529.
• Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
• Any existing cable shields should be connected to ground according to applicable installation
regulations (EN 60079-14). A terminal in the terminal compartment permits a short way
grounding of the cable shields.
• The outer diameter of the connecting cable must be within the sealing range of the cable
entry (6...12 mm / 0.24...0.47").
• Unused cable entries are to be closed.
Ensure that the gaskets and incised gasket ring are tight.
4.2 Power supply
Vortex flowmeters do not require a separate power supply.
The required supply for the built-in electronics is provided via the 4...20 mA current output or the
bus connection.
12/2018 - Z-EN-09001-id-A Exi-Gb
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ELECTRICAL CONNECTIONS
www.bopp-reuther.de
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