KROHNE OPTISONIC 6300 Wiring diagram

Addendum for hazardous areas. These additional instructions are an extension to the
OPTISONIC 6300 quick start and handbook
OPTISONIC 6300
OPTISONIC 6300OPTISONIC 6300
OPTISONIC 6300
Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 02/2019 - 4007265101 - EX OPTISONIC 6300 R04 en

CONTENTS
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OPTISONIC 6300
1 Introduction 3
1.1 Safety instructions for the operator................................................................................. 3
1.2 Approval............................................................................................................................ 3
1.3 OPTISONIC 6000 xxxxxx-Ex .............................................................................................. 3
1.4 UFC 300 F(/i)-Ex ............................................................................................................... 4
1.5 Marking labels (examples)............................................................................................... 5
2 Temperature limits 7
2.1 General ............................................................................................................................. 7
2.2 UFC 300 F(/i)-Ex ............................................................................................................... 7
2.3 OPTISONIC 6000 xxxxxx-Ex .............................................................................................. 7
3 Connection of separate systems 8
3.1 General ............................................................................................................................. 8
3.2 Cable marking .................................................................................................................. 8
3.3 Cable parameters............................................................................................................. 8
3.4 Equipotential bonding....................................................................................................... 8
3.4.1 Signal converter...................................................................................................................... 8
3.4.2 Flow sensor............................................................................................................................. 8
3.5 Signal cable connections.................................................................................................. 9
4 Electrical connections 11
4.1 General ........................................................................................................................... 11
4.2 Non-"Ex ia" I/O connections........................................................................................... 13
4.3 "Ex ia" I/O connections ................................................................................................... 14
5 Maintenance 16
5.1 Maintenance ................................................................................................................... 16
5.2 Before and after opening................................................................................................ 16
5.3 Replacement of mains fuse............................................................................................ 17
5.4 Exchange of electronics unit .......................................................................................... 18
5.4.1 Field version.......................................................................................................................... 19
6 Notes 21

INTRODUCTION 1
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1.1 Safety instructions for the operator
These additional instructions are an extension to the standard documentation and only apply to
the Explosion protected versions of the devices described in this document. All technical
information as described in the standard documentation is applicable, when not specifically
excluded, completed or replaced by the instructions in these additional instructions.
1.2 Approval
The ultrasonic flowmeters are manufactured according to the European directive 2014/34/EU
and IECEx 02 Certification Systems. The flowmeters are approved for installation and use in
hazardous classified locations of Zone 1 and 2 and are in accordance with the European
standards of the EN/IEC 60079 series. They have approval number:
OPTISONIC 6000 xxxxxx-Ex sensor: KIWA 17ATEX0034 X / IECEx KIWA 17.0017X
KIWA 17ATEX0034 X / IECEx KIWA 17.0017XKIWA 17ATEX0034 X / IECEx KIWA 17.0017X
KIWA 17ATEX0034 X / IECEx KIWA 17.0017X
UFC 300 F(/i)-Ex converter: KIWA 18ATEX0007 X / IECEx KIWA 18.0003X
KIWA 18ATEX0007 X / IECEx KIWA 18.0003XKIWA 18ATEX0007 X / IECEx KIWA 18.0003X
KIWA 18ATEX0007 X / IECEx KIWA 18.0003X
The QPS
QPSQPS
QPS approval covers the applicable standards : UL/FM/CSA/ISA.
The original project ID is LR1338-9
LR1338-9LR1338-9
LR1338-9.
1.3 OPTISONIC 6000 xxxxxx-Ex
The OPTISONIC 6000 xxxxxx-Ex is a clamp-on ultrasonic flow sensor and has intrinsically safe
transducer circuits. It is available in three sizes (xxxxxx = small, medium or large), designed for
the size of the pipeline on which the flow sensor is installed.
It is marked with the explosion safety code:
II 2 G Ex ia IIC T6...T4
II 2 G Ex ia IIC T6...T4II 2 G Ex ia IIC T6...T4
II 2 G Ex ia IIC T6...T4
II 2 G Ex ia IIC T6...T2
II 2 G Ex ia IIC T6...T2II 2 G Ex ia IIC T6...T2
II 2 G Ex ia IIC T6...T2 (XT versions)
The intrinsically safe transducer connections of the OPTISONIC 6000 xxxxxx-Ex are connected to
an associated device and have the following maximum values:
WARNING!
• Do not change the device. Unauthorized changes may affect the explosion safety of the
devices.
• 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 standard (equivalent to HD-IEC 60364), especially the regulations in EN/IEC
60079-14 "Electrical installations in hazardous locations" or equivalent national standard
(e.g. DIN VDE 0165 Part 1) must be strictly followed.
• Installation, establishment, utilization and maintenance are only allowed to be executed by
personnel with an education in explosion safety!
U
i
= 85 V I
i
= 250 mA P
i
d0531 W C
i
d45 nF L
i
d400 μH

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1.4 UFC 300 F(/i)-Ex
The UFC 300 F(/i)-Ex is the separate version of the ultrasonic signal converter and has
intrinsically safe connections to the ultrasonic flow sensor in separate version. The ultrasonic
signal converter is either provided with increased safety or intrinsically safe in-/outputs that are
located in the terminal compartment, which can either be configured as “Ex db”or “Ex eb”.
The converter is marked with one of the following codes:
•II 2(1) G Ex db eb [ia] IIC T6 Gb
II 2(1) G Ex db eb [ia] IIC T6 GbII 2(1) G Ex db eb [ia] IIC T6 Gb
II 2(1) G Ex db eb [ia] IIC T6 Gb or II 2 G Ex db eb [ia] [ia Ga] IIC T6 Gb
II 2 G Ex db eb [ia] [ia Ga] IIC T6 GbII 2 G Ex db eb [ia] [ia Ga] IIC T6 Gb
II 2 G Ex db eb [ia] [ia Ga] IIC T6 Gb for the
terminal compartment of the signal converter housing in type of protection increased safety
"Ex eb" according to EN/IEC 60079-7.
•II 2(1) G Ex db [ia] IIC T6 Gb
II 2(1) G Ex db [ia] IIC T6 GbII 2(1) G Ex db [ia] IIC T6 Gb
II 2(1) G Ex db [ia] IIC T6 Gb or II 2 G Ex db [ia] [ia Ga] IIC T6
II 2 G Ex db [ia] [ia Ga] IIC T6II 2 G Ex db [ia] [ia Ga] IIC T6
II 2 G Ex db [ia] [ia Ga] IIC T6 for the terminal compartment
of the signal converter housing designed as flameproof enclosure "Ex db" according to
EN/IEC 60079-1. The customer must provide "Ex db" approved cable glands in accordance
with the European Directive 2014/34/EU.
The terminal compartment contains the connecting terminals for the mains supply and in-
/outputs. It has three M20 x 15 - 6H cable/conduit entry holes for use with appropriate cable
glands, blind plugs or conduit adapters ("Ex eb" or "Ex db" approved).
When conduits are used, the terminal compartment must be a flameproof enclosure "Ex db"
according to EN/IEC 60079-1. The conduits must be sealed by "Ex db" approved sealing devices,
e.g. a stopping box with setting compound, directly at the conduit entrances.
The intrinsically safe transducer output connections have the following values:
WARNING!
"Ex db" approved cable glands / blind plugs are not
notnot
not part of the standard delivery package and
must be provided by the customer or explicitly ordered at the manufacturer.
U
o
= 82 V I
o
= 190 mA P
o
= 390 mW C
o
= 14 PF or 076 PF L
o
= 05 mH or 14 mH

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1.5 Marking labels (examples)
See the examples of the marking labels (i.e. data stickers) below of respectively the measuring
sensor, the FDEOH box (only for large version) and the UFC 300 F(/i)-Ex ultrasonic signal
converter.
Figure 1-1: Example ATEX marking OPTISONIC 6000 xxxxxx on the sensor type plate
Figure 1-2: Example ATEX marking OPTISONIC 6000 xxxxxx- on the FDEOH box type plate
Figure 1-3: Example IECEx marking OPTISONIC 6000 xxxxx on the measuring sensor type plate
Figure 1-4: Example IECEx marking OPTISONIC 6000 xxxxxx on the FDEOH box type plate
1 Name and address of the manufacturer
2 Type designation and manufacturing date of the flowmeter & CE sign with number(s) of notified body / bodies
3 Temperature medium and calibration data
4 Ex specific remarks and circuit info
5 Protection class and Tag no.
6 Ambient temperature (depends on version)
7 Ex logo, marking ATEX/IECEx and Certificate number
Cable box
Cable box

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The type plates of the QPS approved flowmeters look similar, but have a QPS logo on it.
This is also applicable for the IECEx approved flowmeters. These type plates contains the IECEx
certificate number.
Figure 1-5: Example of ATEX marking on the type plate of the UFC 300 F(/i)-Ex converter
Figure 1-6: Example of IECEx marking on the type plate of the UFC 300 F(/i)-Ex converter
1 ATEX / IECEx markings, Certificate number and ambient temperature data
2 Ex specific remarks and circuit info
3 Ex specific warnings
4 Mains supply data
5 Electronic Revision number
6 Type / serial number(s) of the corresponding sensor(s)
7 Additional info (e.g. website and environmental markings)
8 Type designation, CG number and manufacturing date of the device & CE sign with number(s) of notified body / bodies
9 Name and address of the manufacturer
INFORMATION!
For more information on type plates (and/or IO data sticker) and connection data, consult the
applicable manual and quick start documents.

TEMPERATURE LIMITS 2
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2.1 General
Due to the influence of the process temperature, ultrasonic flow sensors inDseparate version
with type designation OPTISONIC 6000 xxxxxx-Ex are not allocated to any fixed temperature
class. For the temperature classification table refer to
OPTISONIC 6000 xxxxxx-Ex on page 7.
The temperature limits apply under the following conditions:
•The instrument is installed and operated in accordance with the installation directions given
in the quickstart and handbook.
•The instrument is not heated up by any additional heat radiation (direct solar radiation, heat
from adjacent plant parts) so causing it to operate above the permissible ambient
temperature range.
•Insulation is not hindering free ventilation of the ultrasonic signal converter housing.
2.2 UFC 300 F(/i)-Ex
The UFC 300 F(/i)-Ex ultrasonic signal converter in separate version is not influenced by the
temperature of the process medium, because it is installed on a distance of the pipe-line and
thus not physically connected to the pipe-line. The UFC 300 F(/i)-Ex signal converter has a
temperature classification of T6 (85°C). The permissible ambient temperature is dependent on
the material that the electronics housing is made of, namely:
•die-casted aluminum: -40...+65ºC
•die-casted stainless steel: -40...+60ºC
2.3 OPTISONIC 6000 xxxxxx-Ex
The OPTISONIC 6000 xxxxxx-Ex clamp-on ultrasonic flow sensor has the following maximum
process temperatures at the maximum ambient temperature T
a
of 70°C.
Temperature class
Temperature classTemperature class
Temperature class Maximum process temperature [
Maximum process temperature [Maximum process temperature [
Maximum process temperature [ºC]
C]C]
C]
T6 80 1
T5 95
T4 120 2
T3 195 3
T2 200 3
1Ta max. = 60°C
2XT version: 130°C
3XT versions only

3CONNECTION OF SEPARATE SYSTEMS
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3.1 General
The electrical connection between the ultrasonic flow sensor and the signal converter is
established with MR 02 - RGX 316 7riax signal cable. The ends of the coaxial cables are provided
with SMB plugs. The signal cable is provided with the system.
3.2 Cable marking
Please refer to Signal cable connections on page 9 for the connection of the different versions.
3.3 Cable parameters
The maximum permitted total capacitance and inductance for the connecting cable is:
C
L
= 129 PF or 079 PF
L
L
= 01 mH or 08 mH
The cable supplied with the instrument has the following parameters:
distributed capacitance C
C
(core/screen) = 94 pF/m
distributed inductance L
C
(core/screen) = 024 PH/m
3.4 Equipotential bonding
3.4.1 Signal converter
The UFC 300 F(/i)-Ex ultrasonic signal converter must always
must alwaysmust always
must always be incorporated within the
equipotential bonding system of the installation in the hazardous classified location. For this
purpose it must be connected to the external U-clamp screw terminal (size M5) on the wall-
mounting device.
The separate bonding conductor must be at least 4 mm
2
(11 AWG) or 2.5 mm
2
(14 AWG) in case it
is mechanically protected, see HD-IEC 60364. Make sure that the core of the bonding wire is
properly mounted under the U-clamp of the external M5 terminal and that the screw is tightly
fixed.
3.4.2 Flow sensor
The intrinsically safe transducer circuits of the flow sensor are galvanically isolated from earth,
therefore an equipotential bonding conductor between the flow sensor and the signal converter
does not have to be connected.
INFORMATION!
The standard length of the signal FDEOHLVPHWHU In case a longer length is required, please
FRQWDFW your local representative for detailed information.

CONNECTION OF SEPARATE SYSTEMS 3
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3.5 Signal cable connections
See the pictures below for details.
Figure 3-1: Connecting the signal cable to the rail (small and medium version)
1 Connect the green cable to "DOWN"
2 Connect the blue cable to "UP"
3 Turn the screws clockwise to secure the cap
Figure 3-2: Connections in cable box (large version)
1 Connect the blue cable to the UP rail
2 Connect the green cable to the DOWN rail
3 Make connections in cable box
4 Cable to converter
5 Turn the screws clockwise to secure the caps

3CONNECTION OF SEPARATE SYSTEMS
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Field version
Figure 3-3: Construction of field version
1 Cover, electronics compartment
2 Cover, terminal compartment for power supply and inputs/outputs
3 Connectors for power
4 Connectors for inputs/outputs
5 Connectors for sensor cable
6 Cover, sensor terminal compartment
Figure 3-4: Connect the signal cable in case of stainless steel / XT version.
1 Put in the connector
2 Turn knob to secure the connector
A = positioning notch in connector (female) on cable
B = positioning cam in connector(male) on sensor device

ELECTRICAL CONNECTIONS 4
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4.1 General
The display cover seals the electronics compartment of the converter housing and provides type
of protection “flameproof enclosure”according to EN/IEC 60079-1. The terminal compartment is
default in type of protection “increased safety”("Ex eb") and can optionally be performed as
flameproof enclosure ("Ex db"). The threaded joints formed by the covers and housing are a tight
fit due to the requirements for type of protection “flameproof enclosure”. Screw the covers on
and off with care and never use excessive force !
Keep the screw-threads free of dirt and well-greased (e.g. with PTFE grease). The grease will
help to prevent the threads from locking due to corrosion.
To unscrew the covers, first release the interlocking devices (one at each cover). Therefore
unscrew the M4 head screw with DQinternal hexagon socket set using a No. 3 Allen key until the
interlocking device can be turned. After the covers are screwed back onto the housing, make
sure that the interlocking devices are properly refitted.
WARNING!
Allow the electronics to de-energize before opening the electronics compartment of the flow
converter housing. Wait at least 35 minutes for T6 and 10 minutes for T5 before opening.
Figure 4-1: Electrical connections
Terminals
TerminalsTerminals
Terminals Function, electrical data
Function, electrical dataFunction, electrical data
Function, electrical data
L, N
L+, L-
Connections for mains supply, always non-Ex i
100...230 V AC, +10%/-15%, 22 VA, 50/60 Hz
12...24 V DC, +30%/-10%, 12W
24 V AC, +10%/-15%, 22 VA, 50/60 Hz
24 V DC, +30%/-25%, 12 W
U
m
= 253 V
A, A-, A+
B, B-
C, C-
D, D-
Connections for signal I/Os (PELV circuits), non-“Ex
ia”or “Ex ia”, are dependent on the specific version
of the UFC 300 converter ordered. Consult the
tables with CG37 numbers for details.

4ELECTRICAL CONNECTIONS
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The exact I/O-configuration for circuits A, B, C and D is order-specific and can be determined by
the CG37 number shown on the I/O sticker inside the terminal compartment. Therefore check
the data on the back of the UFC 300 electronics unit. The CG37 number contains 10 characters of
which the last three characters (XYZ) determine the configuration of the I/O circuits:
For schematic overviews of the CG37numbers, refer to
"Ex ia" I/O connections on page 14 and
refer to
Non-"Ex ia" I/O connections on page 13. These overviews do not show all details. The
exact connection diagram of a specific UFC 300 signal converter can be found on the sticker
inside the terminal compartment.
For use in gaseous hazardous areas:
For use in gaseous hazardous areas:For use in gaseous hazardous areas:
For use in gaseous hazardous areas: The chosen cable glands must have the appropriate type of
protection for the terminal compartment that is increased safety (Ex eb) or flameproof enclosure
(Ex db). They MUST be suitable for the conditions of use and correctly installed.
The flowmeter with the terminal compartment in type of protection increased safety “Ex eb”is
factory supplied with two “Ex eb”approved cable glands and one “Ex eb”approved blanking
element (i.e. stopping plug).
The wiring of instruments has to be in accordance with the requirements as specified in the
relevant national or international standard for electrical installations in hazardous areas, e.g.
EN/IEC 60079-14.
CG37
CG37CG37
CG37 *
**
* *
**
* *
**
* X
XX
X Y
YY
Y Z
ZZ
Z
Pos 1...4 5678910
determine I/O circuits
WARNING!
The flowmeter with the terminal compartment performed as flameproof enclosure
“ Ex db ” is
supplied with one
“ Ex db ” approved stopping plug and two temporary plugs. The temporary plugs
are only intended for sealing the housing against WKHentry of dust, moisture or else during
transport, handling and storage. These temporary plugs must be replaced by suitable
“ Ex db ”
approved cable glands, stopping plugs or conduit adapters with sealing devices before the
flowmeter is put into operation. Unused openings must be sealed by suitable certified plugs.

ELECTRICAL CONNECTIONS 4
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4.2 Non-"Ex ia" I/O connections
The following non-intrinsically safe I/O (inputs/outputs) are available:
I/O PCB
I/O PCBI/O PCB
I/O PCB Input/output functions, U
Input/output functions, UInput/output functions, U
Input/output functions, U
n
nn
n
< 32 V DC, I
n
< 100 mA,
U
m
= 253 V
Basic I/O Current Output, active or passive, with HART
Status Output / Control Input
Status Output
Pulse / Status Output
Modular I/O Current Output, active or passive, with HART
Pulse / Status Output, active or passive, highC or
Namur
Modular carrier with 1 or 2 I/O modules Each module: 1 out of following 3 in-/output
functions:
Current Output, active or passive
Pulse / Status Output, active or passive, highC or
Namur
Control Input, active or passive, highC or Namur
The options separated by “/”are software selectable (can be changed by the user)
The options separated by “or”are hardware versions (must be ordered as such)
All outputs are passive unless otherwise indicated
HighC means High Current input/output, Namur means that the in-/outputs are according to the NAMUR
NE43 standard
Overview of the possible combinations, defined by characters XYZ of the CG37 number
Overview of the possible combinations, defined by characters XYZ of the CG37 numberOverview of the possible combinations, defined by characters XYZ of the CG37 number
Overview of the possible combinations, defined by characters XYZ of the CG37 number
Characters XYZ
Characters XYZCharacters XYZ
Characters XYZ Name of I/O
Name of I/OName of I/O
Name of I/O
circuits
circuitscircuits
circuits Terminals
TerminalsTerminals
Terminals
A, A-, A+
A, A-, A+A, A-, A+
A, A-, A+ Terminals
TerminalsTerminals
Terminals
B, B-
B, B-B, B-
B, B- Terminals
TerminalsTerminals
Terminals
C, C-
C, C-C, C-
C, C- Terminals
TerminalsTerminals
Terminals
D, D-
D, D-D, D-
D, D-
100 Basic I/O CO
CO(a) over A+ SO/CI SO PO/SO
488 to 4LL
588 to 5LL
688 to 6LL
788 to 7LL
888 to 8LL
A88 to ALL
B88 to BLL
C88 to CLL
Modular I/O
or
Modular
Carrier with 1
or 2 I/O
modules
Many combinations possible
Used abbreviations for in-/output functions: CO = Current Output, PO = Pulse Output, SO = Status Output,
CI = Control Input, PA = Profibus PA, FF = Foundation Fieldbus, DP = Profibus DP, RS485 = RS485 Modbus,
n.c. = not connected.
All in-/outputs are passive unless otherwise noted as active with extension (a).

4ELECTRICAL CONNECTIONS
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4.3 "Ex ia" I/O connections
The following intrinsically safe I/O connections are available:
The I/O circuits titled “Ex ia -IO”and “Ex ia -option”are always provided with type of protection
Intrinsic Safety (Ex ia).
Up to a maximum of 4 intrinsically safe (Ex ia) in-/outputs are possible. All intrinsically safe
circuits are galvanically isolated with respect to earth and each other. To avoid summation of
voltages and current, the wiring of these “Ex ia”-circuits must be sufficiently separated, e.g. in
accordance with the requirements of standard EN/IEC 60079-14.
The “Ex ia”in-/outputs may only be connected to other “Ex ia”or “Ex ib”approved devices (e.g.
intrinsically safe isolation amplifiers), even if such devices are installed in a non-hazardous
location!
Connection to non-“Ex ia”devices cancels the “Ex ia”properties of the flowmeter.
Terminals L and N (or L+ and L-) for connection of the mains supply are not available with type of
protection “intrinsic safety”. To achieve the necessary separation distances according to EN/IEC
60079-11 between the non-”Ex ia”and “Ex ia”circuits, the mains terminals are provided with a
semi-circular protection cover with a “snap-in”lock. This cover MUST be closed before
establishing the power supply to the converter.
I/O PCB
I/O PCBI/O PCB
I/O PCB I/O functions
I/O functionsI/O functions
I/O functions
Ex ia -IO Current output + HART
communication
pulse / status output
current output, active + HART
communication
Ex ia IIC
U
i
= 30 V, I
i
= 100 mA, P
i
= 10 W
C
i
= 10 nF, L
i
= negligibly low
Ex ia IIC
U
o
= 21 V, I
o
= 90 mA, P
o
= 05 W
Linear characteristics
C
o
= 90 nF, L
o
= 20 mH
C
o
= 110 nF, L
o
= 05 mH
Ex ia -Option Current output
Pulse / status output / Control
Input
Furrent output, active
Ex ia IIC
U
i
= 30 V, I
i
= 100 mA, P
i
= 10 W
C
i
= 10 nF, L
i
= negligibly low
Ex ia IIC
U
o
= 21 V, I
o
= 90 mA, P
o
= 05 W
LineDr characteristics
C
o
= 90 nF, L
o
= 20 mH
C
o
= 110 nF, L
o
= 0 mH

ELECTRICAL CONNECTIONS 4
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INFORMATION!
For converters with an
“ Ex eb ” terminal compartment, the compartment can be opened in an
energized state for short periods of time, to access the intrinsically safe terminals for possible
checks. However, the semi-circular insulation cover over the non-intrinsically safe mains supply
terminals L and N (or L+ and L-) MUST be kept closed.
Overview of possible "Ex ia" in-/outputs, defined by characters XYZ of the CG37 numbers
Overview of possible "Ex ia" in-/outputs, defined by characters XYZ of the CG37 numbersOverview of possible "Ex ia" in-/outputs, defined by characters XYZ of the CG37 numbers
Overview of possible "Ex ia" in-/outputs, defined by characters XYZ of the CG37 numbers
Characters XYZ
Characters XYZCharacters XYZ
Characters XYZ Name of I/O
Name of I/OName of I/O
Name of I/O
circuits
circuitscircuits
circuits Terminals
TerminalsTerminals
Terminals
A, A-, A+
A, A-, A+A, A-, A+
A, A-, A+ Terminals
TerminalsTerminals
Terminals
B, B-
B, B-B, B-
B, B- Terminals
TerminalsTerminals
Terminals
C, C-
C, C-C, C-
C, C- Terminals
TerminalsTerminals
Terminals
D, D-
D, D-D, D-
D, D-
200 Ex ia -IO n.c. n.c. CO(a) PO/SO
300 n.c. n.c. CO PO/SO
210 Ex ia -IO with
Ex ia -Option CO(a) PO/SO/CI CO(a) PO/SO
220 CO PO/SO/CI CO(a) PO/SO
310 CO(a) PO/SO/CI CO PO/SO
320 CO PO/SO/CI CO PO/SO
Used abbreviations for in-/output functions: CO = Current Output, PO = Pulse Output, SO = Status Output,
CI = Control Input, n.c. = not connected
All in-outputs are passive unless otherwise noted as active with extension (a).

5MAINTENANCE
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5.1 Maintenance
The flowmeters are maintenance free with respect to the flowmetering properties. Within the
scope of periodic inspections required for electrical equipment installed in hazardous areas it is
recommended to check the flameproof converter housing and covers for signs of damage or
corrosion.
For information about the flameproof joints please contact your KROHNE representative.
The four M6 bolts to screw the MH300-Ex housing have a strength of 700 MPa
5.2 Before and after opening
Before opening:
•Make absolutely sure that there is no explosion hazard (gas-free certificate!).
•Make sure that all connecting cables are safely isolated from all external sources!
•Allow the electronics to de-energize before opening the electronics compartment of the
converter housing. Wait at least 35 minutes for T6 and 10 minutes for T5 before opening.
When the instructions above are strictly followed, the display cover (includes glass window) of
the electronics compartment may be removed. First unscrew the head screw with internal
hexagon socket set (size M4) of the interlocking device by a No. 3 Allen key, until the cover can
rotate freely.
After opening:
•Before the cover is screwed back onto the housing, the screw-thread must be clean and well-
greased with an acid and resin-free grease, e.g. PTFE grease.
•Screw the cover as tight as possible onto the housing by hand, until it cannot be opened by
hand anymore. Fixate the screw of the interlocking device tight with the No. 3 Allen key.
WARNING!
the following instructions must always be carefully followed, if the housing of the signal
converter has to be opened respectively closed again.

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5.3 Replacement of mains fuse
• Pull the display unit of the mounting frame and turn display unit carefully aside.
• Unscrew the two screws size M4 that hold the mounting frame with the electronics unit.
• Carefully pull the mounting frame with electronics unit out of the housing, until the MCX -
connectors are accessible and can be disconnected from the sensor driver PC-board. Now
carefully remove the unit from the housing, while keeping the coaxial cables down, and close
to the housing wall.
• The mains fuse is located in a fuse holder at the back-end of the electronics unit on the top
printed circuit board (power supply PCB). The specifications must be as follows:
• Reassemble the unit in reverse order.
WARNING!
Before commencing the work, refer to Before and after opening on page 16
, then continue as
follows:
Fuse type: 5 x 20 mm (H) / GDC 2A according to IEC 60127-2/V
Fuse type: 5 x 20 mm (H) / GDC 2A according to IEC 60127-2/VFuse type: 5 x 20 mm (H) / GDC 2A according to IEC 60127-2/V
Fuse type: 5 x 20 mm (H) / GDC 2A according to IEC 60127-2/V
Power supply
Power supplyPower supply
Power supply Electrical data
Electrical dataElectrical data
Electrical data KROHNE part number
KROHNE part numberKROHNE part number
KROHNE part number
12...24 V DC 250 V / 2 A T 5060200000
24 V AC/DC 250 V / 2 A T 5060200000
100...230 V AC 250 V / 08 A 5080850000
WARNING!
Before reassembling the unit, refer to Before and after opening on page 16
, then:

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5.4 Exchange of electronics unit
Before opening the converter housing:
Before opening the converter housing:Before opening the converter housing:
Before opening the converter housing:
• Select yes
i - if in the screen appears “load sensor data
load sensor dataload sensor data
load sensor data”, the electronics units were not fully
compatible. You can proceed by selecting yes. Note that all settings need to be checked and
changed. Only the sensor calibration data are loaded.
- if in the screen appears “load no data
load no dataload no data
load no data”, all data have been lost. Contact your local
representative.
WARNING!
Before commencing the work, refer to Before and after opening on page 16
, then continue as
follows:
DANGER!
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
WARNING!
Observe without fail the local occupational health and safety regulations. Any work done on the
electrical components of the measuring device may only be carried out by properly trained
specialists.
INFORMATION!
Make notes of important specific data, before exchanging the electronics.
Menu settings are stored on the circuit board (or backplane), that is fixed to the housing. After
exchange of electronics unit and power-up, the following start up screen appears:
Load all data?
Load all data?Load all data?
Load all data?

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5.4.1 Field version
Perform the following procedures:
• Unscrew the display cover of the electronics compartment by hand, by turning it counter
clockwise 1.
• Remove the display by using two screwdrivers 2.
• Unscrew the two M4 screws 3at the electronics unit 4.
• Pull the two metal pullers 5at the left and right of the display, using a screwdriver or similar
tool and partially pull out the electronics unit.
DANGER!
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
Figure 5-1: Unscrew the cover and remove the display
Figure 5-2: Pull out printed circuit board
CAUTION!
Please pay attention that the same amount of force is applied on both pullers, otherwise the
connector at the backside can be damaged.

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• Remove the MCX -connectors 6from the electronics unit 4.
• Check compatibility between the removed and new electronics unit 4, by checking the power
voltage.
• Slide the new electronics unit 4partially back into the housing.
• Mount the MCX -connectors back onto the electronics unit 4.
• Push the metal pullers 5back to their original position.
Don't use excessive force, otherwise the connector at the backside can be damaged!
• Screw the electronics unit back to the housing.
• Re-install the display and make sure not to kink the display's flat ribbon cable.
• Replace cover and tighten by hand.
• Connect power.
DANGER!
Electrostatic discharge (ESD) can damage electronic parts. Make sure to discharge yourself by
wearing a wrist strap. If no wrist strap is available, ground yourself by touching a metal surface
that is grounded.