ELECTRICAL CONNECTIONS
4
15
DK37/M8 - H250/M8
www.krohne.com
11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 en
4.1 General notes
The built-in equipment is connected electrically in the indication unit. The circuits are designed
in type of protection Intrinsic Safety and are galvanically isolated from ground (test voltage
≥
500 V
eff
).
The connecting cables should be selected according to the applicable installation standards 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.
•
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
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 the intrusion into the
equipment of foreign bodies and moisture (ingress protection code) IP66 / 67 according to
IEC 60529 in the rated temperature range.
•
Before connecting or loosening the equipentential bonding conductor, ensure there are no
differences in potential.
•
Any existing cable shield shall be conneted to ground in accordance with the installation
regulations.
•
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).
Connection diagrams
INFORMATION!
Ensure that the gaskets and incised gasket ring are tight.
Indicator M8M - M8MG
1
Terminal Kmin
2
Terminal Kmax
