KROHNE ALTOFLUX IFM 4080 K EEx EN - Manual (Page 11)

10
The flameproof terminal feed-through has seven terminals in total, the top two terminals are
used for connection of the power supply, the third one is only used for mounting of a metal
dividing plate with insulating cover plate. The remaining four are used for the intrinsically safe
signal in-/output circuits of the installed MODIS modules.
The metal dividing plate and the insulating cover plate warrant the required separation
distances (i.e. clearances, creepage distances and distances through insulation) between the
non-intrinsically safe power supply terminals and the intrinsically safe signal in-/output
circuits. The insulating cover plate is provided with a sticker that contains important
instructions how to remove and re-install the cover plate and the conditions under which it
should be established (circuits not live !).
IMPORTANT !
Carefully follow the instructions on the sticker that is glued on top of the insulating
cover plate, that covers the non-intrinsically safe power supply terminals !
For the connection diagrams of the intrinsically safe signal in-/outputs of the installed MODIS
modules in the IFC 090i-EEx electronics unit (see figure 6, 7 and 8 on the following pages). It
has to be noted that the intrinsically safe signal in-/outputs may only be connected to the
following listed apparatus' (registering devices like amp-meters, pulse counters, etc.):
•
EEx-approved intrinsically safe apparatus;
•
EEx-approved associated apparatus;
•
Passive apparatus as defined in your national standard for installation of electrical
apparatus in hazardous locations (equivalent of EN 60079-14, e.g. DIN VDE 0165).
Other types of apparatus may only be connected to the intrinsically safe signal in-/outputs
through EEx-approved safety barriers, isolating interface units and the like. These barriers or
units are not depicted in the connection diagrams of figure 6, 7 and 8 for reasons of
readability. It is assumed that they are an integrated part of the registering devices or as
separate devices connected in series with them. The registering devices may only be
installed in the hazardous location if they also have a type of protection for explosion safety
according to the European Standards of the EN 500xx series, or if they are constructed as
prescribed in your standard national code of practice.
When the intrinsically safe signal in-/outputs are connected to other intrinsically safe or
associated apparatus, the maximum safety values (i.e. entity parameters) of all intrinsically
safe circuits have to be considered.
IMPORTANT !
The 100…230 Vac power supply versions of the IFC 090i-EEx signal converter electronics
unit with MODIS modules can only be equipped with passive outputs. The connection
diagrams in the following figures 6 through 8 with the numbers 1, 3, 6 ,8 and 10 are
therefore not applicable for the 100…230 Vac power supply versions.