KROHNE ALTOFLUX 2W IFM 4042K EEx-ATEX EN - Manual (Page 7)

ALTOFLUX 2W IFM 4042 K - EEx 7
Version A
Terminal compartment "EEx de [ib]" with U
m
= 60 V
The customer can decide in which type of explosion protection the output circuits - current output,
additional power supply and binary outputs (i.e. pulse and/or status outputs) - can be driven: in
type of protection "EEx ib", "EEx e" or "EEx d".
If type of protection EEx e or EEx d is used, the markings for "Intrinsically safe" - that are blue o-
ring around the cable gland and the blue sticker in the connection compartment - should be
removed.
The safety-technical maximum voltage U
m
(maximum effective AC or DC voltage) of the mains
power supply system for the terminal compartment in type of protection EEx de [ib] is restricted to
60 V. With this maximum voltage it is guaranteed that the protective components on which the
intrinsic safety of these circuits depends are not overloaded. This condition is met if the mains
power supply system satisfies the PELV requirements in accordance with IEC 364 / IEC 536.
Safety technical note
• It is not allowed to mix two different types of protection (e.g. current output in type of
protection "EEx ib" and pulse/status outputs in "EEx e" or "EEx d").
• The end-user is allowed to change the type of protection of the terminal compartment by the
afterwards a random times, when it is garuanteed that the maximum voltage U
m
of the mains
power supply system is always limited at 60 V!
Version B
Terminal compartment "EEx de" with U
m
= 250 V
This version is intended for applications were the mains power supply system provides a
maximum safety-technical voltage of Um = 250 V. The terminals can either be provided with type
of protection increased safety "EEx e" according to EN 50019 or flameproof enclosure "EEx d"
conform to EN 50018. Type of protection intrinsical safety "EEx ib" is not allowed for this version.
Important notes (applicable for versions A and B)
• The intrinsically safe "EEx ib" internal electrode circuit is supplied by the IFC 040-EEx signal
converter electronics unit inside the electronics compartment. This circuit is separated from all
other circuits up to a maximum voltage of Um = 250 V according to En 50020. The internal
electrode circuit with type of protection intrinsic safety "ib" is galvanically connected with the
PE (housing potential).
• The current output (terminals I, I⊥) and the additional power supply (terminals 1L=, 0L=) must
be galvanically separated connected and driven from each other. To avoid voltage or current
summation, at least one of the two circuits must be isolated from earth potential. It is not
allowed to drive both circuits at the same time with grounded zener barriers. Both current
circuits, including all connection cables, must be galvanically separated at all times according
to the valid regulations.
• Also in case of non-intrinsically safe connections, it is absolutely necessary to maintain a
galvanic separation between the current output circuits and the additional power supply
connections.
• A safe connection of the IFC 040-EEx signal converter electronics with the equipotential
bonding system is achieved through the zinc-plated mounting frame, which must be securely
screwed to the aluminum signal converter housing (PE potential) by means of two long-
shafted screws. To access the two long-shafted screws it is necessary to unscrew the display
unit and fold it aside. The screws must be tightly secured with a torque of 1.3 Nm (a 2 Pt.
Phillips screwdriver is recommended).