KROHNE OPTISONIC 7060 EN - Manual (Page 30)

OPTISONIC 7060
Electrical & mechanical installation manual 730962.31.00 page 30 of 52
3.4.6 Operation in hazardous areas in accordance with Directive 94/9/EC (ATEX)
The power supply and field connections are designed with the increased type of protection
("e"). The transducer connections are of an intrinsically safe design ("ia").
All screw-type terminals as well as air and creepage distances of the OPTISONIC 7060 comply
with EN 50019.
Connection characteristics
Power supply connection Field connections
Separate terminal box, separated from the field
connections with partition wall in the housing
and cover to EN 50020. Separate terminal box, separated from the
power supply connections with partition wall in
the housing and cover to EN 50020.
Cable routing via EExe cable gland, M5 ground
terminal integrated into housing section (cast). Cable routing via 2x EExe cable gland
Connection
variants
The protection concept for the OPTISONIC 7060 permits the following connection variants:
• Power supply connection and field connections with increased type of protection ("e")
• Intrinsically safe power supply connection and field connections ("i")
• Power supply connection with increased type of protection ("e"), where the field
connections are intrinsically safe ("i")
The user must decide which variant to use, taking into account EN 60079-14.
A combination of intrinsically safe and non-intrinsically safe circuits is not permitted in the
terminal box for the field connections.
The rated voltage of non-intrinsically safe circuits is U
M
= 253 V.
Requirements regarding cabling in hazardous areas (Europe)
• The cables must fulfill the requirements to EN 60079-14.
• Cables that are subject to exceptional thermal, mechanical, or chemical loads must be
specially protected (e.g. laid in open-ended conduits).
• Cables that are not fire protected must be verified to DIN VDE 0472, Part 804, test type
B with regard to fire resistance.
• Attach ferrules to the wire ends to ensure that they do not split up.
• The applicable requirements regarding air and creepage distances must be observed in
accordance with EN 50019. The available air and creepage distances in the terminal box
must not be reduced when connecting the cables.
• Unused cable glands must be replaced by the EExe plugs supplied.
• The equipotential bonding must be in accordance with EN 60079-14.
• The meter body and CONVERTER housing must be connected to the potential equalizer.
• In intrinsicallysafe circuits, install potential equalizers along the wiring runs of the current
outputs.
• The applicable national specifications must also be observed.