4
ELECTRICAL CONNECTIONS
12
DK46 - DK800
www.krohne.com 05/2019 - 4000430905 - AD DK46-800 Exi-II2G R06 en
4.1 General notes
The built-in equipment is connected electrically in the connection box. The circuits are designed
in protection type "intrinsically safe" and galvanically isolated from ground (test voltage
≥ 500 V
eff
).
The connecting cables should be selected according to the applicable installation standards
(e.g. EN 60079-14) and the maximum operating temperature. Ensure that no residual current
can form between separate intrinsically safe signal circuits.
• The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
• Not used cores must be securely connected to the earth potential of the hazardous area or
carefully insulated against each other and against earth (test voltage ≥ 500 V
eff
).
• Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
• Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(ingress protection) IP65 according to EN 60529.
• The outer diameter of the connecting cable must be within the sealing range of the cable
entry (3...7 mm / 0.12...0.27").
Ensure that the gaskets and incised gasket ring are tight.
4.2 Power supply
The variable area flowmeter does not require a separate power supply.
4.3 Inputs / outputs
The terminal assignment of the built-in electrical equipment is described in the standard
documentation. The signal circuits of the variable area flowmeters may only be connected to
certified intrinsically safe slave units or circuits. For more information refer to chapter
"Electrical data".
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