KROHNE OPTIWAVE 500 Series Wiring diagram

OPTIWAVE 3500 C
OPTIWAVE 6500 C
OPTIWAVE 7500 C
Supplementary Instructions for ATEX applications
Supplementary Instructions for ATEX applicationsSupplementary Instructions for ATEX applications
Supplementary Instructions for ATEX applications
OPTIWAVE X500
OPTIWAVE X500OPTIWAVE X500
OPTIWAVE X500 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 10/2020 - 4005809803 - AD ATEX OPTIWAVE x500 R03 en

CONTENTS
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OPTIWAVE X500
1 General safety information 4
1.1 Scope of the document..................................................................................................... 4
1.2 Device description ............................................................................................................ 4
1.3 Standards and approvals.................................................................................................. 5
1.4 Device categories ............................................................................................................. 5
1.4.1 Ex ia-approved devices ........................................................................................................... 5
1.4.2 Ex db ia- and Ex ia tb-approved devices................................................................................. 7
1.4.3 Ex ic devices ............................................................................................................................ 8
1.5 ATEX nameplate ............................................................................................................... 9
2 Installation 10
2.1 Special conditions........................................................................................................... 10
2.2 Precautions..................................................................................................................... 10
2.2.1 General notes........................................................................................................................ 10
2.2.2 Electrostatic discharge......................................................................................................... 11
2.2.3 Optional purging system....................................................................................................... 12
2.3 Operating conditions ...................................................................................................... 13
2.3.1 Ambient and process connection temperatures.................................................................. 13
3 Electrical connections 17
3.1 General notes ................................................................................................................. 17
3.2 Terminal compartment .................................................................................................. 18
3.2.1 How to open the terminal compartment .............................................................................. 18
3.2.2 How to close the terminal compartment ............................................................................. 19
3.3 Terminal tightening capacity.......................................................................................... 20
3.4 Equipotential bonding system........................................................................................ 20
3.5 Ex ia and Ex ic equipment............................................................................................... 21
3.5.1 How to connect the electrical cables ................................................................................... 21
3.5.2 Maximum intrinsically safe values for the electrical circuit................................................ 21
3.5.3 Supply voltage ....................................................................................................................... 21
3.6 Ex db ia / Ex ia tb equipment .......................................................................................... 22
3.6.1 General notes........................................................................................................................ 22
3.6.2 How to connect the electrical cables ................................................................................... 22
3.6.3 Supply voltage ....................................................................................................................... 24
3.6.4 Maximum voltage for the electrical circuit .......................................................................... 24
4 Start-up 25
5 Service 26
5.1 Periodic maintenance..................................................................................................... 26
5.2 Keep the device clean..................................................................................................... 26
5.3 How to remove the device .............................................................................................. 27
5.4 Manufacturer.................................................................................................................. 27

CONTENTS
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OPTIWAVE X500
5.5 Returning the device to the manufacturer..................................................................... 28
5.5.1 General information.............................................................................................................. 28
5.5.2 Form (for copying) to accompany a returned device............................................................ 29
6 Notes 30

1 GENERAL SAFETY INFORMATION
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1.1 Scope of the document
These instructions are applicable only to the explosion-protection version of the radar level
transmitter. For all other data, use the Quick Start and Handbook. If you do not have these
documents, please contact the nearest office or download them from the manufacturer's
internet site.
1.2 Device description
OPTIWAVE x500 is a series of devices that includes the OPTIWAVE 3500, OPTIWAVE 6500 and
OPTIWAVE 7500. They are 2-wire level transmitters that use FMCW (Frequency-Modulated
Continuous Wave) radar technology.
The OPTIWAVE 3500 measures level, volume, distance to surface and reflectivity of liquids,
pastes and slurries. It is for installation on storage tanks and process tanks.
The OPTIWAVE 6500 measures level, volume, distance to surface, and reflectivity of solid
particles, granulates and powders. It is suitable for installation on storage tanks and silos.
The OPTIWAVE 7500 measures level, volume, distance to surface and reflectivity of liquids,
pastes and slurries. It is suitable for installation on storage tanks, process tanks and stilling
wells.
Measurements are displayed via a DTM (device type manager) for remote communication or on
an optional integrated display screen with wizard-driven setup.
The level transmitter is approved for use in potentially explosive atmospheres when equipped
with the appropriate options.
INFORMATION!
The information in these supplementary instructions only contains the data applicable to
explosion protection. The technical data for the non-Ex version in the Handbook shall be valid in
its current version, provided that it is not rendered invalid or replaced by these supplementary
instructions.
WARNING!
Installation, commissioning and maintenance may only be carried out by "Personnel trained in
explosion protection".

GENERAL SAFETY INFORMATION 1
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1.3 Standards and approvals
You can download the certificates from our internet site.
1.4 Device categories
1.4.1 Ex ia-approved devices
The Ex ia-approved device has the markings that follow for Gas Groups:
OPTIWAVE 3500, OPTIWAVE 6500 and OPTIWAVE 7500
All versions
•II 1/2 G Ex ia IIC T6...T3 Ga/Gb
The Ex ia-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Gas Groups IIA, IIB and IIC. It is certified for applications requiring
EPL Ga/Gb. The equipment is also applicable for applications that agree with EPL Gb or EPL Gc.
It agrees with temperature classes T6 thru T1 if the temperature limits are obeyed. For more
data, refer to
Ambient and process connection temperatures on page 13.
DANGER!
In compliance with European Directive 2014/34/EU (ATEX 114), the ATEX version of the device
described in these Supplementary Instructions conforms to European Standards
EN IEC 60079-0:2018, EN 60079-1:2014, EN 60079-11:2012, EN 60079-26:2015 and
EN 60079-31: 2014. The Ex ia, Ex db ia and Ex ia tb versions are certified for use in hazardous
areas by Kiwa ExVision B.V. under the EU-Type Examination Certificate KIWA 17ATEX0026 X. The
Ex ic version is certified for use in hazardous areas by Kiwa ExVision B.V. under the Type
Examination Certificate KIWA 17ATEX0027 X. For more data, refer to the manufacturer's
declaration. You can download the manufacturer's declaration from our internet site.
WARNING!
Carefully read the ATEX approval certificates. Obey the boundary conditions.
INFORMATION!
The equipment must have EPL Ga/Gb if it is installed in the boundary wall between zone 0 and
zone 1 (the antenna is in zone 0 and the signal converter is in zone 1).

1 GENERAL SAFETY INFORMATION
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The Ex ia-approved device has the markings that follow for Dust Groups:
OPTIWAVE 3500
All versions
•II 1/2 D Ex ia IIIC T85°C...T150°C Da/Db
OPTIWAVE 6500 and OPTIWAVE 7500
Without distance piece
•II 1/2 D Ex ia IIIC T85°C...T150°C Da/Db
OPTIWAVE 6500 and OPTIWAVE 7500
With distance piece
•II 1/2 D Ex ia IIIC T85°C...T200°C Da/Db
The Ex ia-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Dust Groups IIIA, IIIB and IIIC. It is certified for applications requiring
EPL Da/Db. The equipment is also applicable for applications that agree with EPL Db or EPL Dc.

GENERAL SAFETY INFORMATION 1
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1.4.2 Ex db ia- and Ex ia tb-approved devices
The Ex db ia-approved device has the markings that follow for Gas Groups:
OPTIWAVE 3500, OPTIWAVE 6500 and OPTIWAVE 7500
All versions
•II 1/2 G Ex db ia IIC T6...T3 Ga/Gb
The Ex db ia-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Gas Groups IIA, IIB and IIC. It is certified for applications requiring
EPL Ga/Gb. The equipment is also applicable for applications that agree with EPL Gb or EPL Gc.
It agrees with temperature classes T6 thru T1 if the temperature limits are obeyed. For more
data, refer to
Ambient and process connection temperatures on page 13.
The Ex ia tb-approved device has the markings that follow for Dust Groups:
All versions
•II 1/2 D Ex ia tb IIIC T85°C...T150°C Da/Db
OPTIWAVE 6500 and OPTIWAVE 7500
Without distance piece
•II 1/2 D Ex ia tb IIIC T85°C...T150°C Da/Db
OPTIWAVE 6500 and OPTIWAVE 7500
With distance piece
•II 1/2 D Ex ia tb IIIC T85°C...T200°C Da/Db
The Ex ia tb-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Dust Groups IIIA, IIIB and IIIC. It is certified for applications requiring
EPL Da/Db. The equipment is also applicable for applications that agree with EPL Db or EPL Dc.
INFORMATION!
The equipment must have EPL Ga/Gb if it is installed in the boundary wall between zone 0 and
zone 1 (the antenna is in zone 0 and the signal converter is in zone 1).

1 GENERAL SAFETY INFORMATION
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1.4.3 Ex ic devices
The Ex ic-approved device has the markings that follow for Gas Groups:
OPTIWAVE 3500, OPTIWAVE 6500 and OPTIWAVE 7500
All versions
•II 3 G Ex ic IIC T6...T3 Gc
The Ex ic-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Gas Groups IIA, IIB and IIC. It is certified for applications requiring
EPL Gc. It agrees with temperature classes T6 thru T1 if the temperature limits are obeyed. For
more data, refer to
Ambient and process connection temperatures on page 13.
The Ex ic-approved device has the markings that follow for Dust Groups:
OPTIWAVE 3500
All versions
•II 3 D Ex ic IIIC T85°C...T150°C Dc
OPTIWAVE 6500 and OPTIWAVE 7500
Without distance piece
•II 3 D Ex ic IIIC T85°C...T150°C Dc
OPTIWAVE 6500 and OPTIWAVE 7500
With distance piece
•II 3 D Ex ic IIIC T85°C...T200°C Dc
The Ex ic-approved device is suitable for use in potentially explosive atmospheres of all
flammable substances in Dust Groups IIIA, IIIB and IIIC. It is certified for applications requiring
EPL Dc.

GENERAL SAFETY INFORMATION 1
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1.5 ATEX nameplate
Figure 1-1: Nameplate on the signal converter housing
1 ATEX certification number
2 Equipment approval category (explosive atmosphere –gas and dust) and:
–Types of device protection including approved Gas Groups and temperature classes and equipment protection level
–Types of device protection including approved Dust Groups, maximum surface temperature and equipment protec-
tion level
3 Ex ia or Ex ic approvals:
Ex ia or Ex ic approvals:Ex ia or Ex ic approvals:
Ex ia or Ex ic approvals: Intrinsically safe circuit data. Refer to 7for the input voltage range.
Ex db ia or Ex ia tb approvals:
Ex db ia or Ex ia tb approvals:Ex db ia or Ex ia tb approvals:
Ex db ia or Ex ia tb approvals: Maximum voltage in accordance with EN 60079-11. Refer to 7for the input voltage
range.
4 WARNING: Potential electrostatic charging hazard –see instructions
For more data, refer to
Electrostatic discharge on page 11.
5 Cable entry type and size (M20×1.5, ½NPT)
6 Notified body number (production site). This number is applicable only to equipment with an EU-Type Examination Cer-
tificate.
7 Input voltage range and maximum current
8 Type code

2 INSTALLATION
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2.1 Special conditions
This device can be installed on the applicable auxiliary equipment: a bypass chamber, a stilling
well or a communicating pipe.
2.2 Precautions
2.2.1 General notes
Make sure that:
•you can get access to the device,
•there is sufficient space around the device for inspections,
•you can see the device nameplate, and
•there are no external forces applied on the device.
WARNING!
When you install the device, obey the conditions in the EU-Type Examination certificate or the
Type Examination certificate. These conditions include:
• The special conditions for safe use.
• The Essential Health and Safety Requirements.
You can download the certificates from our internet site.
DANGER!
This installation must agree with EN 60079-14: Explosive atmospheres
– Part 14: Electrical
installations design, selection and erection.
DANGER!
The device contains a PEEK boundary wall between the process and the signal converter. Do not
use the device if the PEEK part is not resistant to corrosion by the tank product.

INSTALLATION 2
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2.2.2 Electrostatic discharge
Do not install in a location where the electrostatic charge can increase. For example:
•locations near ventilation systems,
•locations where there is a risk of an increase in electrostatic charge caused by compressed
air and dust,
•locations near machines that use friction,
•locations near systems that apply electrons as a spray (e.g. near electrostatic painting
systems), and
•locations near other machines and systems that can have large electrostatic charges.
DANGER!
Risk of electrostatic discharge (ESD) from painted surfaces, the plastic sun cover, the Lens
antenna, the flange plate protection and the slanted flange.
DANGER!
Make sure that the device and adjacent objects do not rub together.
Make sure that all personnel and equipment are correctly grounded.
If dirt collects on the device, clean it with a damp cloth.
ESD warning
Figure 2-1: ESD warning (on the device nameplate)
1 Text: Warning! Potential electrostatic hazard –see instructions

2 INSTALLATION
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2.2.3 Optional purging system
This option is applicable to:
•OPTIWAVE 6500
OPTIWAVE 6500OPTIWAVE 6500
OPTIWAVE 6500: all Lens antenna sizes
•OPTIWAVE 7500
OPTIWAVE 7500OPTIWAVE 7500
OPTIWAVE 7500: devices that have a DN40 or DN70 Lens antenna
Figure 2-2: Risk of ESD
1 Sun cover
2 Lens antenna
3 OPTIWAVE 7500:
OPTIWAVE 7500:OPTIWAVE 7500:
OPTIWAVE 7500: Flange plate protection
4 OPTIWAVE 6500:
OPTIWAVE 6500:OPTIWAVE 6500:
OPTIWAVE 6500: Slanted flange
Figure 2-3: Purging system
1 ¼NPT or G ¼purging connection
INFORMATION!
If delivered with the device, the purging connection is plugged with a 1/4 NPTF or G 1/4 screw.
The 1/4 NPTF screw is engaged on a minimum of 3
½ threads.
CAUTION!
If the 1/4 NPTF or G 1/4 screw is removed from the purging connection, make sure that the
installation agrees with the Ex requirements for the purging system.

INSTALLATION 2
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Connection and operation of the purging connection are the responsibility of the user. The
operator is also responsible for selection of a suitable fluid to purge the device.
Devices installed in a gas atmosphere
•The purging fluid temperature must be less than the ignition temperature of the gas or
vapour atmosphere
Devices installed in a dust atmosphere
•Dust clouds:
Dust clouds:Dust clouds:
Dust clouds: The purging fluid temperature must be less than 2/3 of the ignition temperature
•Dust layers (thickness <5 mm / 0.2
Dust layers (thickness <5 mm / 0.2Dust layers (thickness <5 mm / 0.2
Dust layers (thickness <5 mm / 0.2¨):
):):
): The difference between the purging fluid temperature
and the ignition temperature must be more than +75°C
Devices installed in a gas or dust atmosphere
•The purging fluid temperature must be between the minimum and maximum limits for the
gasket (for more data, refer to the handbook) and the type of antenna (for more data, refer to
Ambient and process connection temperatures on page 13)
2.3 Operating conditions
The allowable ambient temperature and related process connection temperature range for the
device depends on the temperature classes and maximum surface temperature marked on the
nameplate.
2.3.1 Ambient and process connection temperatures
WARNING!
If the two conditions are applicable, then use the worst condition.
For data about dust layers thicker than 5 mm / 0.2
¨ , refer to regulations given in EN 60079-14:
Explosive atmospheres
– Part 14: Electrical installations design, selection and erection.
WARNING!
The gasket temperature must be in the approved limits. For more data, refer to "Pressure and
temperature ranges" in the Installation chapter of the handbook. The type of gasket and gasket
material must agree with the process.
WARNING!
The reference point for the process temperature is the flange facing (flanges), the thread stop
(threaded connections) or the facing (hygienic connections) of the device. In the tables that
follow, this reference point will be referred to as the "process connection temperature".
WARNING!
An explosive atmosphere is a mixture of air and flammable gases, vapour, mist or dust in
atmospheric conditions. If you do not use the device in these conditions (T
atm
= -20...+60 ° C and
p
atm
= 0.8...1.1 barg), do an analysis of the risk of ignition.
T
atm
= atmospheric temperature and p
atm
= atmospheric pressure.

2 INSTALLATION
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The tables that follow are applicable in these conditions:
•Device installation must agree with the instructions given in the handbook.
•Make sure that the device temperature does not increase because of other heat sources
(sunlight, adjacent system components etc.). The device must not be operated above the
maximum permitted ambient temperature.
•Do not put insulation around the signal converter. Make sure that the airflow around the
signal converter is sufficient. It is permitted to have insulation on the pipe or stilling well and
the process connection.
OPTIWAVE 3500
WARNING!
Make sure that the maximum process connection temperature and maximum ambient
temperature are not more than the values given in the tables.
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Maximum ambient temperature Maximum process
connection
temperature
(max. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
T6 T85°C+60 +60 +60
+48 +43 +85
T5 T100°C+75 +75 (+68) 1 +75
+63 +58 +100
T4 T135°C+64 +56 (+52) 1 +115
+55 +43 +135
T3 T150°C+49 +33 +150
1Values in parentheses are for Ex db ia- or Ex ia tb-approved devices
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Minimum ambient temperature Minimum process
connection
temperature
(min. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
All classes All surface
temperatures
-40 -40 -40

INSTALLATION 2
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OPTIWAVE 6500 and OPTIWAVE 7500
Without distance piece
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Maximum ambient temperature Maximum process
connection
temperature
(max. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
T6 T85°C+60 +60 +60
+48 +43 +85
T5 T100°C+75 +75 (+68) 1 +75
+63 +58 +100
T4 T135°C+64 +56 (+52) 1 +115
+55 +43 +135
T3 T150°C+49 +33 +150
1Values in parentheses are for Ex db ia- or Ex ia tb-approved devices
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Minimum ambient temperature Minimum process
connection
temperature
(min. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
All classes 1 All surface
temperatures 1
-40 -40 -40
-35 -33 -50
1Min. process connection temperature is -20°C, if a Kalrez®6375 gasket is used. Min. process connection temperature is -40°C, if an
FKM/FPM gasket is used.
INFORMATION!
If the device has the flange plate protection option, the permitted process connection
temperature range is -50...+150
° C.

2 INSTALLATION
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OPTIWAVE 6500 and OPTIWAVE 7500
With distance piece
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Maximum ambient temperature Maximum process
connection
temperature
(max. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
T6 T85°C+60 +60 +60
+53 +51 +85
T5 T100°C+75 +75 (+69) 1 +75
+68 +66 (+64) 1 +100
T4 T135°C+70 +68 (+61) 1 +115
+65 +61 (+58) 1 +135
T3 2 T200°C2 +61 +56 (+55) 1 +150
+53 +46 +180
+48 +40 +200
1Values in parentheses are for Ex db ia- or Ex ia tb-approved devices
2Max. process connection temperature is +150°C, if an EPDM gasket is used
Temperature
class for
EPL Ga/Gb,
EPLGborEPLGc
Maximumsurface
temperature for
EPL Da/Db,
EPL Db or EPL Dc
Minimum ambient temperature Minimum process
connection
temperature
(min. process
temperature)
Aluminium
housing
Stainless steel
housing
[°C]
All classes 1 All surface
temperatures 1
-40 -40 -40
-37 -36 -50
1Min. process connection temperature is -20°C, if a Kalrez®6375 gasket is used. Min. process connection temperature is -40°C, if an
FKM/FPM gasket is used.
INFORMATION!
If the device has the flange plate protection option, the permitted process connection
temperature range is -50...+200
° C.

ELECTRICAL CONNECTIONS 3
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3.1 General notes
WARNING!
• De-energize the circuit.
• Use the applicable cable glands for the cable entry openings in the housing (M20×1.5 or
½ NPT). For the cable entry size, refer to the device nameplate.
• Ex d-approved devices:
Ex d-approved devices:Ex d-approved devices:
Ex d-approved devices: Use heat-resistant cables and cable glands certified for continuous
operation above +90
° C.

3 ELECTRICAL CONNECTIONS
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3.2 Terminal compartment
3.2.1 How to open the terminal compartment
Equipment needed
•Wrench (supplied)
•3 mm Allen wrench (not supplied)
• Use the 3 mm Allen wrench to remove the cover stop.
• Use the wrench to remove the cover.
For more data about the procedure, refer to the handbook.
WARNING!
• Do not blow dust with compressed air if it collects on the housing. Clean the device with a
damp cloth before you remove the terminal compartment cover.
• Make sure that no dust goes into the electrical compartment after you open the cover.
Figure 3-1: How to open the terminal compartment cover

ELECTRICAL CONNECTIONS 3
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3.2.2 How to close the terminal compartment
Equipment needed
•Wrench (supplied)
•3 mm Allen wrench (not supplied)
• Attach the cover. Make sure that a slot on the top of the cover is correctly aligned with the hole
for the cover stop.
• Attach the cover stop (make sure that there is also a spring washer and a socket head screw).
Tighten the screw with a 3 mm Allen wrench.
DANGER!
Ex d applications
Ex d applicationsEx d applications
Ex d applications
Make sure that the terminal compartment is sealed and its cover is fully engaged. An explosion
can cause death or injury to personnel and/or damage to equipment. Obey the instructions that
follow:
Figure 3-2: How to close the terminal compartment cover

3 ELECTRICAL CONNECTIONS
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3.3 Terminal tightening capacity
The terminal tightening capacity of input/output terminals is:
3.4 Equipotential bonding system
Connect the device to the equipotential bonding system for the hazardous location.
You can use 2 terminals to connect the device to the equipotential bonding system:
•a ground connection in the terminal compartment and
•an external ground terminal adjacent to the cable entries
You can also use the process connection to connect the device to the equipotential bonding
system. Make sure that there is a good electrical connection to the process connection (flange,
thread etc.).
Ex ia- and Ex ic-approved devices
The device electronics are isolated with a rating of 500 V
RMS
.
Ex db ia- or Ex ia tb-approved devices
•4....20mA passive - HART version:
4....20mA passive - HART version:4....20mA passive - HART version:
4....20mA passive - HART version: The device does not agree with the 500 V
RMS
dielectric
strength requirement. Obey all the instructions given in the "Electrical connections" chapter.
•Fieldbus version:
Fieldbus version:Fieldbus version:
Fieldbus version: The device electronics are isolated with a rating of 500 V
RMS
.
Type of wire Terminal tightening capacity
[mm²][AWG]
Flexible or rigid 2.5 13
Figure 3-3: Examples of terminals for the equipotential bonding system
1 Internal terminal
2 External terminal (on the housing)