KROHNE IFC 090F Converter EEx-ATEX EN - Manual (Page 7)

ALTOFLUX IFC 090 F-EEx and ALTOFLUX IFC 090 F / i-EEx 7
2 Electrical connection
2.1 Equipotential bonding system
The IFC 090 F/…-EEx signal converter must always be incorporated into the equipotential
bonding system of the hazardous area. This connection can be achieved through the PE/FE
conductor connected to the PE terminal in the terminal compartment (see figure of terminal
arrangement) or through a separate PE conductor, cross sectional area at least 4 mm
2
, connected
to the external PE clamp, placed below the converter housing.
2.2
Intermediate junction box ZD-EEx
For safety reasons, standard cables with a rubber or thermoplastic insulation sheath may only be
used up to a continuous operating temperature of 70°C at the cable entry and 80°C at the
branching point of the connecting cables. In case that the temperature at the above mentioned
parts exceed the maximum values, heat-resistant cables must be installed at the IFS x000 F-EEx
primary head in remote design. Also see the EC-type examination certificate of the primary head.
The table below summarizes the conditions for use of heat-resistant cables for the IFS x000 F-
EEx primary head.
Use of heat-resistant cables
Primary head Meter size Ambient temperature Process liquid temperature
DN25 - 150 ≤ 40°C
≤ 50°C
≤ 60°C
not required
≥ 155°C
≥ 105°C
IFS 4000 F-EEx
≥ DN200 ≤ 40°C
≤ 50°C
≤ 60°C
not required
≥ 145°C
≥ 110°C
IFS 5000 F-EEx DN2.5 - 100 ≤ 40°C
≤ 50°C
≤ 60°C
≥ 165°C
≥ 130°C
≥ 100°C
IFS 6000 F-EEx DN2.5 - 80 ≤ 40°C
≤ 50°C
≤ 60°C
not required
≥ 160°C
≥ 115°C
In case that heat-resistant cables are required, install the intermediate junction box ZD-EEx at a
distance of approximately 5 m from the primary head. Connect heat-resistant cables (see cables
D and E in the next section) between the primary head’s junction box and the intermediate
junction box ZD-EEx. The standard cables (types B and C) can be used between the IFC 090
F/…-EEx signal converter and intermediate junction box. See connection diagram 2.
The silicone rubber insulated connection cable for the magnetic field coils must be protected
against mechanical damages between the primary head and intermediate junction box by a
conduit system with edge protections. Intermediate box ZD-EEx has terminals with type of
protection increased safety “e” conform to EN 50019. The intermediate box is incorporated in the
equipotential bonding system of the installation via its external clamp terminal.
2.3 Connecting
cables
NOTE: The following described cables are shown in the next connection diagrams.
Cable A
Signal cable for current output and binary outputs (pulse and status output): The cable parameters
must be in accordance with the regulations in the EN 60079-14 "Electrical installations in
hazardous locations" or an equivalent national standard. For the MODIS version with IFC 090i-
EEx electronics unit (right detail in connection diagram 1) the signal cable for the intrinsically safe
signal in-/outputs must also conform the requirements as specified in the relevant standard
national code of practice for the installation of electrical apparatus with type of protection Intrinsic
Safety "i".