KROHNE DK 32-DK 34 ATEX II3G Ex nA-ic EN - Manual (Page 10)

4
ELECTRICAL CONNECTIONS
10
DK32 DK34
www.krohne.com 03/2013 - 4002148602 AD DK32/34 II3G R03 en
Electrical connections
4.1 General notes
For version DK3./../../S/../.-Ex (plug), the separate intrinsically safe signal circuits of protection
level "ic" are electrically connected in the terminal compartment of the plug housing and for
version DK3./../../L/../.-Ex (connecting cable) it is the connecting cable as illustrated in the
connection diagram. Permissible maximum values (electrical data) must be observed.
Connecting cable
The connecting cables must be selected according to prevailing installation standards (e.g.
EN 60079-14).. The outer diameter of the connecting cable must be within the sealing range of
the cable entry. The connecting cables must be fixed and laid in such a way as to be sufficiently
protected against damage.
All cores that are not used must be securely connected to the earth potential of the hazardous
area or carefully insulated against each other and against ground (test voltage ≥ 500 V
eff
).
Cable entries / Blanking plugs
The DK3./../../S/../.-Ex variable area flowmeter is equipped with a connector. The connector
guarantees protection from foreign bodies and water (protection category) IP65 acc. to EN
60529. The cable entry is closed with a plug. The plug is to be replaced with a suitable connecting
cable (nominal diameter range 6...9mm).
Connection diagrams
Contact connection Cable colors of assembled cable
1 Min minus white
2 Min plus yellow
3 Max minusMax minus green
4 Max plus brown
5 Lift slot
6 Fastening screw of connection box
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