KROHNE IFM4042KEEx-ATEX User Manual

© KROHNE 12/2002 7.30920.32.00

Addition to the
installation and operating instructions

ALTOFLUX 2W
IFM 4042 K/EEx

2-wire compact
electromagnetic flowmeter

Variable area flowmeters
Vortex flowmeters
Flow controllers

Electromagnetic flowmeters

Ultrasonic flowmeters
Mass flowmeters
Level measuring instruments
Communications technology
Engineering systems & solutions
Switches, counters, displays and recorders
Heat metering
Pressure and temperature

Warning!

• No safety technical changes may be made to the devices. Unauthorized changes might affect
the explosion safety of the devices.

• These additional instructions are an extension to the Installation and Operating Instructions
and only applies for the EEx version of the IFM 4042 K magnetic-inductive compact
flowmeter. All technical information described in the Installation and Operating Instructions
are applicable, when not specifically excluded or replaced by the instructions in these
additional instructions.

Contents

1 System components 3

1.1 General information 3

1.2 Data plates 4

1.3 Primary head 4

1.4 IFC 040-EEx signal converter 5

1.4.1 Electronics compartment 5

1.4.2 Terminal compartment 5

1.5 Cable or conduit entries 5

2 Electrical connection 6

2.1 Equipotential bonding system 6

2.2 Terminal arrangement 6

2.3 Description of the output circuits 6

2.4 Connection diagram 8

2.5 Safety-technical data 9

2.6 Connection examples 9

2.6.1 Example of IFM 4042 K in 2-wire mode 9

2.6.2 Example of IFM 4042 K in 2×2-wire mode (4-wire) 10

3 Operation of the signal converter 11
4 Maintenance 11
5 Ordering information 11
6 Technical data 11

7 Replacement of electronic unit 12

7.1 Removal of the electronics unit 12

7.2 Inseration of the electronics unit 12

8 EC Declaration of conformity 13
9 EC-Type examination certificate 14

Be sure to follow these instructions!

Important!

• The prescriptions and regulations as well as the electrical data described in the EC-type
examination certificate must be obeyed.

• Beside the instructions for electrical installations in non-hazardous locations according to the
applicable national standard (equivalent of IEC 364, e.g. VDE 0100), especially the
regulations in EN 60079-14 "Electrical installations in hazardous locations" or equivalent
national standard must be followed.

• Installation, establishment, utilization and maintenance are only allowed to be executed by
personnel with an education in explosion safety!

2 ALTOFLUX 2W IFM 4042 K - EEx

1 System components

1.1 General information

General information The Altoflux 2W IFM 4042 K-EEx electromagnetic compact flowmeter in 2­wire technology is in accordance with European Directive 94/9/EC (ATEX 100a) and approved
for hazardous classified locations of Zone 1 and 2 under:

KEMA 01 ATEX 2200 X

The IFM 4042 K-EEx compact flowmeter is designed for ambient temperatures in the range of

-40°C up to +60°C.

The allowed process liquid temperature is a.o. limited by the combustible atmosphere that
(possibly) surrounds the apparatus, which again is determined by the temperature class of the
atmosphere (first column of the tables). See tables below for details.

For dusts the second column of the two below listed tables is applicable.

Temperature classification DN 25 - 150 with PFA liner

Temperature
class

(for gases) (for dusts)
T6 T85°C 70°C 70°C 70°C

T5 T100°C 85°C 85°C 85°C
T4 T135°C 120°C 120°C 115°C
T3 T180°C 180°C 180°C 115°C
Use heat-resistant cables no no yes

Temperature classification DN 10 - 20 and >DN 200

Temperature
class

(for gases) (for dusts)
T6 T85°C 75°C 70°C 70°C

T5 T100°C 95°C 90°C 75°C
T4 T135°C 130°C 115°C 75°C
T3

Max. surface
temperature

Max. surface
temperature

T180°C

*

Maximum process liquid temperature

≤ 40°C Ta ≤ 50°C Ta ≤ 60°C

T

a

Maximum process liquid temperature

≤ 40°C Ta ≤ 50°C Ta ≤ 60°C

T

a

150°C 115°C 75°C

* T 150 °C for DN 10-20 and > DN 200

The IFM 4042 K-EEx flowmeter consists of the IFC 040-EEx signal converter unit, which is
screwed on top of the primary head (i.e. the measuring unit). The compact flowmeter is marked
with one of the codes below, depending on the meter size:

• DN 10 - 20 II 2GD EEx dme [ib] IIC T6…T3 ("EEx e and d" terminal compartment)

• DN 25 - 150 II 2GD EEx de [ib] IIC T6…T3 ("EEx e and d" terminal compartment)

• DN 200 - 300 II 2GD EEx dqe [ib] IIC T6…T3 ("EEx e and d" terminal compartment)

• DN 350 and up II 2GD EEx de [ib] IIC T6…T3

("EEx e" and "EEx d" terminal compartment)
For details see the EC-type examination certificate in Section 9 of these instructions.

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1.2 Data plates

IFM 4042 K-EEx, type "EEx de [ib]"

IFM 4042 K-EEx, type "EEx de"

1.3 Primary head

The primary head is the measuring unit of the IFM 4042 K-EEx compact flowmeter and contains
two field coils (see table below for the type of protection) and two electrodes in type of
protection intrinsic safety category "ib" according to EN 50020.

Meter size Type of protection

DN 10 up to DN 150 Housing: Encapsulation "m" according to EN 50028 and

increased safety “e” according to EN 50 019
Electrodes: Intrinsic safety "ib" according to EN 50020

DN 200 up to DN 300 Housing: Powder filling “q” according to EN 50017 and

increased safety “e” according to 50 019
Electrodes: Intrinsic safety "ib" according to EN 50020

DN 350 and larger Field coils: Increased safety "e" according to EN 50019

Electrodes: Intrinsic safety "ib" according to EN 50020

NOTE

4 ALTOFLUX 2W IFM 4042 K - EEx

The intrinsically safe electrode circuits of the IFM 4042 K-EEx compact flowmeter
are only internal circuits and not accessible for the customer.

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.

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2 Electrical connection

2.1 Equipotential bonding system

The IFM 4042 K-EEx magnetic-inductive compact flowmeter must be incorporated into the
equipotential bonding system through the internal of external PE-clamp. Latter clamp is suitable
for wires till 4 mm2 cross section.
Disconnection from the equipotential bonding system is only allowed when the flowmeter is not in
contact with power supplies or ground voltages outside the hazardous area.

2.2 Terminal arrangement

To connect external devices to the signal output terminals, the wiring requirements for the type of
protection of the compartment must also be conform to the international or national standard
involved (e.g. EN 60079-14). The terminal arrangement is shown by the following figure.

Terminal arrangement in terminal compartment

I⊥ I B1 B⊥ B2 1L= 0L=

current binary power booster
output outputs (additional power supply)

PE protective ground
FE functional ground

The following outputs are available for connection to external circuits (see figure above):

Current output (terminals I, I ⊥)

This circuit constitutes a passive 4-20 mA current loop and includes the HART protocol of the
communication device (choice of polarity is free).

Additional power supply or Power Booster (terminals 1L=, 0L=)

These terminals are connected to provide the 2x2 wire mode (choice of polarity is free).

Binary outputs (terminals B1, B⊥, B2)

Terminals B1 and B⊥ can be configured as pulse or status output through software.
Terminals B2 and B⊥ can be configured as pulse or status output to NAMUR.

Galvanical separation of circuits

The internal electrode circuit with type of protection "EEx ib" is galvanically connected to the
aluminum signal converter housing (i.e. PE potential).
The current output, the additional power supply and the internal field current circuit are
galvanically connected to each other.

2.3 Description of the output circuits

The terminal compartment of the IFM 4042 K-EE is, with respect to the explosion protection,
available in two versions. The version can be identified by the information that is listed on the
data plate, which is mounted on the signal converter housing.

6 ALTOFLUX 2W IFM 4042 K - EEx

Version A Terminal compartment "EEx de [ib]" with Um = 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 o­ring around the cable gland and the blue sticker in the connection compartment - should be
removed.

The safety-technical maximum voltage Um (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

of the mains

m

power supply system is always limited at 60 V!

Version B Terminal compartment "EEx de" with Um = 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 long­shafted 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).

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