KROHNE OPTIFLUX 2000-4000 IECEx EN - Manual (Page 10)

3
ELECTRICAL CONNECTIONS
10
OPTIFLUX
www.krohne.com 06/2010 - 7312092100 - AD OPTIFLUX IECEx R01 en
3.1 Installation instructions
When used in a potentially gas explosive atmosphere, certified cable entry devices must be used
that are suitable for the application and correctly installed.
When used in a potentially dust explosive atmosphere, vertified cable entries with a degree of
ingress protection of at least IP6X according to IEC 60529 must be used that are suitable for the
application and correctly installed.
Unused openings must be closed with suitable certified closing elements.
The field coils in type of protection "mb" must be protected by a 160 mA fuse. The breaking
capacity of the fuse must be in accordance with the prospective short circuit current of the
supply. This concerns following flowmeters:
OPTIFLUX 2100 C / 4100 C DN10...20 ("mb")
INFORMATION!
The internal field coil fuses of the IFC 100 converter fulfil the above mentioned requirement with
respect to the breaking capacity.
The OPTIFLUX 2100 C / 4100 C compact flowmeters are normally delivered with two Ex e
certified M20x1.5 cable glands, clamping range ∅6...12mm.