ELECTRICAL CONNECTIONS
4
15
DK37/M8 - H250/M8
www.krohne.com
05/2018 - 4005351602 - AD DK37/H250/M8 II2GD R02 en
4.1 General notes
The built-in equipment is connected electrically in the indication unit. 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
(protection category) IP66/67 according to EN 60529.
•
The outer diameter of the connecting cable must be within the sealing range of the cable
entry (plastic PG 3...7 mm / 0.12...0.28", metal PG 6...10 mm / 0.24...0.39").
•
Unused cable entries are to be closed (>IP66/67).
Ensure that the gaskets and incised gasket ring are tight.
