KROHNE ESK4 Series Wiring diagram

Electronic signal output
Equipment category II 2G, EPL Gb
ESK4... ...
ESK4... ...ESK4... ...
ESK4... ... Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 10/2017 - 4001078703 - AD ESK4 Ex II2G R03 en

CONTENTS
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ESK4... ...
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Safety instructions............................................................................................................ 4
2 Device description 5
2.1 Description of device ........................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 5
2.4 Equipment category .........................................................................................................7
2.5 Types of protection ........................................................................................................... 7
2.6 Ambient temperature / temperature classes.................................................................. 7
2.7 Electrical data................................................................................................................... 8
3 Installation 9
3.1 Mounting ........................................................................................................................... 9
3.2 Special conditions............................................................................................................. 9
4 Electrical connections 10
4.1 General notes ................................................................................................................. 10
4.2 Power supply .................................................................................................................. 10
4.3 Internal connections.......................................................................................................10
5 Operation 11
5.1 Start-up........................................................................................................................... 11
5.2 Operation ........................................................................................................................ 11
6 Service 12
6.1 Maintenance ................................................................................................................... 12
6.2 Dismantling .................................................................................................................... 12
7 Notes 13

SAFETY INSTRUCTIONS 1
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1.1 General notes
These additional instructions apply to explosion-protected versions of the ESK4... electronic
signal output with the designation II 2 G. They complete the standard manual for the non-
explosion protected versions.
The information given in these instructions contains only the data relevant to category 2
explosion protection. The technical details given in the standard documentation for the non-
explosion protected versions apply unchanged unless excluded or superseded by these
instructions.
1.2 EU conformity
The manufacturer declares with the EU declaration of conformity on his own responsibility
conformity with the protection goals of directive 2014/34/EU for use in hazardous areas with gas.
Conformity with harmonised standards was checked in accordance with
EN 60079-0:2012 + A11:2013 and EN 60079-11:2012.
The EU declaration of conformity is based on the EC type examination certificate of the
Physikalisch Technische Bundesanstalt (PTB):
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If needed the EC type examination certificate can be downloaded from the manufacturer's
website.
1.3 Approval according to the IECEx scheme
Conformity for use in hazardous areas with gas and dust was tested in accordance with the
"IECEx Certification Scheme for Explosive Atmospheres" according to
IEC 60079-0:2011 and IEC 60079-11:2011.
The number of the IECEx certificate is:
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If needed, the IEC certificate can be downloaded from the manufacturer's website.
PTB 10 ATEX 2021 X
PTB 10 ATEX 2021 XPTB 10 ATEX 2021 X
PTB 10 ATEX 2021 X
IECEx PTB 17.0033 X
IECEx PTB 17.0033 XIECEx PTB 17.0033 X
IECEx PTB 17.0033 X

1 SAFETY INSTRUCTIONS
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1.4 Safety instructions
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
The operator or his agent is responsible for observing any additional standards, directives or
laws if required due to operating conditions or place of installation.

DEVICE DESCRIPTION 2
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2.1 Description of device
ESK4...electronic signal outputs serve to determine the position of magnetic encoders. They are
designed for installation in M40 type indicators and are usually used in measuring devices to
measure the volume flow and level of flammable and non-flammable gases and liquids.
The analogue current signal (4...20 mA) with superimposed HART
®
communication signal and
optional switching outputs and bus connection modules for connection to the Foundation
Fieldbus FF or Profibus PA is available as an output signal.
2.2 Description code
The safety description code consists of the following elements *:
2.3 Marking
The marking of the module is on the housing, where the following identification plate can be
found.
Figure 2-1: Description of the safety description code
1 E
EE
Electronic S
SS
Signal output K
KK
Krohne
2 Version of the signal output
4.
4.4.
4. - 4...20 mA analogue signal output with HART
®
signal
4-I/O
4-I/O4-I/O
4-I/O - Switching output with counter
4-FF
4-FF4-FF
4-FF - Foundation Fieldbus connection module
4-PA
4-PA4-PA
4-PA - Profibus PA connection module
3 Marking without influence on the explosion safety protection
Figure 2-2: Example of a nameplate for a standard version
1 Type designation, manufacturing date and production order
2 Ex data according to PTB 10 ATEX 2021 X or IECEx PTB 17.0033 X
3 Manufacturer logo and address
4 Notified body
5 Note to observe the documentation and for disposal
6 Note on electrostatic charge

2 DEVICE DESCRIPTION
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Figure 2-3: Example of nameplates for FF and Profibus PA versions
1 Type designation, manufacturing date and production order
2 Manufacturer logo and address
3 Notified body
4 Ex data according to PTB 10 ATEX 2021 X or IECEx PTB 17.0033 X
5 Note to observe the documentation and for disposal
6 Note on electrostatic charge
Figure 2-4: Example of nameplate for a version with I/O
1 Type designation, manufacturing date and production order
2 Manufacturer logo and address
3 Notified body
4 Ex data according to PTB 10 ATEX 2021 X or IECEx PTB 17.0033 X
5 Note to observe the documentation and for disposal
6 Note on electrostatic charge
IECEx PTB 17.0033 X
2G Ex ia IIC T6...T1 Gb

DEVICE DESCRIPTION 2
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2.4 Equipment category
The electronic signal outputs are designed in category II 2G or EPL Gb according to EN 60079-0
and EN 60079-11 for use in zone 1.
2.5 Types of protection
The electronic signal output is designed with protection type intrinsic safety, protection level "ia"
according to EN 60079-11.
The marking is: II 2G Ex ia IIC T6 Gb
II 2G Ex ia IIC T6 GbII 2G Ex ia IIC T6 Gb
II 2G Ex ia IIC T6 Gb
2.6 Ambient temperature / temperature classes
Depending on the version and the temperature class, the electronic signal outputs are approved
for the following ambient temperatures.
Permissible ambient temperatures for ESK4... ...
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
II
IIII
II Explosion protection, group II
2
22
2Equipment category 2
G
GG
GGas explosion protection
Ex ia
Ex iaEx ia
Ex ia Intrinsically safe, protection level "ia"
IIC
IICIIC
IIC Suitable for gas group IIC, IIB and IIA
T6
T6T6
T6 Suitable for temperature class T6...T1
Gb
GbGb
Gb EPL, suitable for zone 1
Type of signal output Temperature class Ambient temperature in
[°C] [°F]
ESK4 ...
ESK4-I/O T6 -40...+60 -40...+140
T5 -40...+75 -40...+167
T4...T1 -40...+85 -40...+185
ESK4-FF
ESK4-PA T6 -40...+55 -40...+131
T5 -40...+70 -40...+158
T4...T1 -40...+85 -40...+185

2 DEVICE DESCRIPTION
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2.7 Electrical data
The connection may only be made using separately certified intrinsically safe isolating amplifiers
or zener barriers with the following maximum values per circuit:
Electrical values for ESK4... ...
The connector behind the cutout on the ESK4... module cover connects internal intrinsically safe
circuits. Only certified modules of type ESK4-I/O, ESK4-FF or ESK4-PA may be connected.
The additional connector on the ESK4-I/O module connects the optional display as an internal
intrinsically safe circuit.
Type of signal output Terminals Maximum value per intrinsically safe circuit
U
i
I
i
P
i
C
i
L
i
ESK4... 11, 12 30 V 130 mA 1W 0nF 10 µH
ESK4-I/O 1, 2, 3 or
4, 5, 6 or
7, 8
30 V 130 mA 1W 10 nF 0µH
ESK4-FF / ESK4-PA D, D- 24 V 380 mA 5.32W 0nF 0µH
FISCO FIELD DEVICE

INSTALLATION 3
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3.1 Mounting
Mounting and setup must be carried out according to the applicable installation standards
(e.g. EN 60079-14) by qualified personnel trained in explosion protection. The information given
in the manual and the supplementary instructions must always be observed.
Install electronic signal outputs so that
•no external forces are affecting the housing.
•the nameplate is clearly visible.
•it can be operated from a location with secure footing.
3.2 Special conditions
Housing protection
Electronic signal outputs are to be protected against external influences by a housing (minimum
IP20).
Electrostatic charge
The plastic housing of the electronic signal output may be electrostatically charged. Take
appropriate measures to ensure that no charge is applied to the surface of the housing during
installation and operation.
ESK4-FF and ESK4-PA connection
When operating the ESK4-FF or ESK4-PA module for connection to intrinsically safe bus
systems, the ESK4... module may not be powered separately. The ESK4... module is fed by the
flat ribbon cable from the modules ESK4-FF or ESK4-PA.
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
The electrical connection of the intrinsically safe signal circuit with protection level "ia" to the
modules ESK4... , ESK4-FF and ESK4-PA is independent of polarity.
The connection of the ESK4-I/O module is polarity sensitive.
The connection to all modules is made by colour-coded pluggable connection terminals. The
colour coding of the terminals must be observed. The permissible maximum values of the
separate circuits (electrical data) must be observed.
The connecting cables must be selected according to prevailing installation standards
(e.g. EN 60079-14). The connecting cables must be fixed and laid so they are sufficiently
protected against damage.
All cores that are not used must be securely connected to the ground potential of the hazardous
area or carefully insulated against each other and against ground (test voltage ≥500 V
eff
).
4.2 Power supply
Electronic signal outputs do not require a separate power supply. The required supply is
provided via the 4...20 mA current output or bus-connection.
4.3 Internal connections
All modules should be connected internally using the ribbon cables provided. These are non-
interchangeable and protected against reverse polarity.

OPERATION 5
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5.1 Start-up
Start-up is only permitted when the electronic signal output:
•is correctly installed in a housing and connected.
•has been checked for the proper state with regard to its installation and connection
requirements.
The user of the system must have it checked before start-up in compliance with the national
regulations for checks before startup.
5.2 Operation
All modules may be parameterized via the HART
®
communication and the switches or keys may
be operated during operation.

6 SERVICE
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6.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular tests are required in order to maintain the proper
condition.
The following checks are recommended:
•Check the housing, connection terminals and feed lines for corrosion and/or damage.
Close the housing following any maintenance work on the electronic signal output.
6.2 Dismantling
Replacing the electronic signal output
Due to the modular design of the electronic signal output, from a safety perspective it is possible
to replace a module with an identical spare part.
Exchanging and dismantling should take place in a de-energised state, if at all possible. If this is
not possible, the basic conditions for intrinsic safety (e.g. no grounding or connection of different
intrinsically safe circuits to one another) must be observed during dismantling.
The dismantling and installation is within the responsibility of the operator.
CAUTION!
There may be a risk of losing measuring accuracy!

NOTES 7
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7 NOTES
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NOTES 7
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Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
© KROHNE 10/2017 - 4001078703 - AD ESK4 Ex II2G R03 en - Subject to change without notice.
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