KROHNE ALTOFLUX 2W IFM 4042K EEx-ATEX EN - Manual (Page 5)

ALTOFLUX 2W IFM 4042 K - EEx 5
1.4 IFC 040-EEx signal converter
The IFC 040-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.
1.4.1 Electronics
compartment
The electronics compartment accommodates the pre-certified IFC 040-EEx electronics unit with
approval number PTB 00 ATEX 2213 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.
1.4.2 Terminal
compartment
The terminal compartment has seven terminals for connection of the current output (I, I ⊥), the
additional power supply or "Power Booster" (1L=, 0L=) and binary pulse/status outputs (B1, B ⊥,
B2). Chapter 2 shows the terminal arrangement of the IFC 040-EEx. There are two versions
possible with a different explosion protection according to the European Standards, which is
dependent on the safety-technical maximum voltage Um of the mains power supply system to
which the flowmeter is connected.
Version A
Terminal compartment "EEx de [ib]" with Um = 60 V
The connections of the output circuits can be configured by the customer in one of the following
types of explosion protection:
• EEx [ib] (intrinsic safety, category "ib") or
• EEx e (increased safety) or when the precaution in section 1.5 is obeyed
• EEx d (flameproof enclosure)
•
Version B
Terminal compartment "EEx de" with Um = 250 V
The customer can configure the connections of the output circuits in one of the following types of
explosion protection:
• EEx e (increased safety) or when the precaution in section 1.5 is obeyed
• EEx d (flameproof enclosure)
The two versions (A and B) of the terminal compartment as well as their requirements are
described in more detail in section 2.3 of these additional instructions.
1.5 Cable or conduit entries
The used cable entries (glands and/or blind plugs) must be ATEX certified. Standard the IFM 4042
K-EEx flow-meter is delivered with an EEx e cable gland and EEx e blind stop. (see also the EEx
code on cable gland and blind stop). The cable gland and blindstop are suitable for connections in
EEx e and EEx ib, but not for EEx d.
Safty technical note
Therefore, when connection in EEx d is planned a special EEx d certified conduits, gland(s) or
blindstops must be used! ATEX approved "EEx d" cable glands, screw-threaded adapters as well
as blind plugs are no integral part of the delivery package and must be purchased by the customer
himself or can be ordered through their (local) Krohne representative as special parts ! Note that
for a correct choice of the EEx d cable gland the precise cable type and cable dimensions (e.g.
outside diameter) must be given.