KROHNE ALTOFLUX IFM4042K EEx EN - Manual (Page 4)

3
Meter size Type of protection
DN10 up to DN20
Field coils: Increased safety "e" according to EN 50019
Encapsulation "m" according to EN 50028
Electrodes: Intrinsic safety "ib" according to EN 50020
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 4042 K-EEx compact flowmeter are
only internal circuits and not accessible for the customer.
1.3 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 IP65 conform to EN 60529.
1.3.1 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.
1.3.2 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 U
m
of the mains power supply
system to which the flowmeter is connected.
Version A: Terminal compartment in type of protection "EEx de [ib]" with U
m
= 60 V.
The connections of the output circuits can be ordered by the customer in one of the following
types of explosion protection:
•
EEx [ib] (intrinsic safety, category "ib") or
•
EEx e (increased safety) or
•
EEx d (flameproof enclosure).
Version B: Terminal compartment in type of protection "EEx de" with U
m
= 250 V.
The customer can order the connections of the output circuits in one of the following types of
explosion protection:
•
EEx e (increased safety) or
•
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 2.1 of these additional instructions.