KROHNE IFC 090F Converter EEx-ATEX EN - Manual (Page 4)

ALTOFLUX IFC 090 F-EEx and ALTOFLUX IFC 090 F / i-EEx 4
1.3
IFC 090/…-EEx signal converter
The IFC 090/…-EEx signal converter consists of the pre-certified cylindrical housing of die-casted
aluminum (type AX/P-EEx with KEMA No. Ex-99.E.8128 U). It has two separate compartments,
divided from each other by an integrated wall with casted flameproof terminal feed-through. The
neck at the bottom of the housing that is connected to the wall-mounting bracket with junction box,
contains flameproof cable feed-through type LC-2/EEx, which is approved by KEMA under No.
Ex-01.E.2036 U. The wall-mounting bracket and junction box are also made of die-casted
aluminium. The signal converter housing is on both ends closed by a cylindrical cover with
M115x2-6H6g screw-thread and O-ring sealing. The signal converter has an ingress protection
degree of IP 65 / IP 67 conform to EN 60529.
1.3.1 Electronics
compartment
The electronics compartment accommodates the pre-certified IFC 090…-EEx electronics unit with
approval number PTB 98 ATEX 2012 U. The compartment is designed with type of protection
flameproof enclosure "d" according to EN 50018 and closed by a threaded flameproof display
cover. The IFC 090…-EEx unit is inserted into the electronics compartment via two sliding rubbers
that position and fixate it at the front in the housing. Two M4 screws mount the unit and a third M4
screw fixates the copper earth strip at the back-end of the safety barrier printed circuit board. The
three screws are screwed to the integrated aluminium wall in-between terminal and electronics
compartment. The safety barrier provides the electrodes inside the primary head with type of
protection intrinsic safety “ib” according to EN 50020.
See tables on the next pages for the electrical data of the available power supplies (e.g. mains
voltages, etc.). The safety barrier has the following maximum values (entity parameters):
Maximum output voltage
U
0
= 9 V
Maximum output current I
0
= 38 mA
Maximum allowed external capacitance C
0
= 4.9 µF
Maximum allowed external inductance L
0
= 23 mH
1.3.2 Terminal
compartment
The terminal compartment has seven M4 clamp terminals for connection of the power supply and
signal output circuits (binary and current outputs). Section 2 shows the terminal arrangement for
the regular and MODIS version of the IFC 090/…-EEx signal converter. The terminals are
separated from each other by insulation plates (nine in total, one at each end). The terminal
arrangement of the MODIS version (i.e. IFC 090i-EEx) is shown in Sect. 2.6. Two of the terminals
are used for connection of the non-intrinsically safe power supply and four terminals (marked with
"*") for the intrinsically safe, category "ia" signal outputs (i.e. current, pulse resp. status output) of
the MODIS modules. The non-intrinsically and intrinsically safe terminals are separated from each
other by a metal dividing plate, which is screwed to the remaining (not connected) M4 terminal.
The two non-intrinsically safe power supply terminals are covered by an insulating plate.
The terminal compartment (with standard type of protection increased safety "e") is standard
equipped with two ATEX or E-generation approved "EEx e" cable glands. The terminal
compartment can also be provided as a flameproof enclosure "d", in which case ATEX or E-
generation approved "EEx d" cable glands of size Pg13.5, Pg16 or M20x1.5 are factory installed
or must be installed by the customer. For flameproof conduit systems, the terminal compartment
must have type of protection flameproof enclosure "d" according to EN 50018. The conduits must
be sealed by "EEx d" approved (within the ATEX 100a directive) sealing devices (i.e. stopping
box) directly at the conduit entrances of the as flameproof enclosure performed terminal
compartment. All used cable glands, blind plugs and sealing devices for conduit systems must
have an ingress protection degree of IP65 or better.