KROHNE ALTOFLUX IFM 4080 K EEx EN - Manual (Page 4)

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In case of the MODIS version IFM 4080 K/i-EEx , the electronics unit of type IFC 090i-EEx is
provided with protective modules, which provide intrinsically safe output signals of category
"ia". The flowmeter is then marked with one of the following codes:
•
DN25-150: II 2GD EEx d [ia] [ib] IIC T6…T3 (EEx d terminal compartment) or
II 2GD EEx de [ia] [ib] IIC T6…T3 (EEx e terminal compartment).
•
DN200 and up: II 2GD EEx de [ia] [ib] IIC T6…T3. (both EEx d and EEx e
terminal compartment)
For details see the EC-type examination certificate in Section 11 of these instructions.
1.2 Primary head
The primary head is the measuring unit of the IFM 4080 K/…-EEx compact flowmeter and
contains two field coils (see table 3 for type of protection) and two electrodes in type of
protection intrinsic safety category "ib" according to EN 50020.
Meter size Type of protection
DN25 up to DN150
Housing: Flameproof enclosure "d" according to EN 50018
Electrodes: Intrinsic safety "ib" according to EN 50020
DN200 and larger
Field coils: Increased safety "e" according to EN 50019
Electrodes: Intrinsic safety "ib" according to EN 50020
Table 3: Types of protection of primary head.
NOTE:
The intrinsically safe electrode circuits of the IFM 4080K/…-EEx compact flowmeter are
only internal circuits and not accessible for the customer.
1.3 IFC 090/…-EEx signal converter
The IFC 090/…-EEx signal converter consists of a cylindrical housing of die-casted
aluminum, which 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
contains a flameproof cable feed-through. The signal converter housing is on both ends
closed by a cylindrical threaded cover with O-ring sealing. The housing has an ingress
protection degree of at least IP67 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. It is closed by a flameproof
display cover with glass window.
1.3.2 Terminal compartment
The terminal compartment has seven terminals for connection of the power supply and signal
output circuits. Chapter 2 and 7 show the terminal arrangement for the regular and MODIS
version of the IFC 090/…-EEx signal converter. The terminal arrangement of the MODIS
version (i.e. IFC 090i-EEx) is shown in figure 4 on page 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 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.