KROHNE OPTISWIRL 4070 Wiring diagram

Vortex flowmeter
Equipment category II3G
OPTISWIRL 4070
OPTISWIRL 4070OPTISWIRL 4070
OPTISWIRL 4070 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 05/2016 - 4001268803 - AD OPTISWIRL 4070C Ex-II3G R04 en

CONTENTS
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OPTISWIRL 4070
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 Safety instructions............................................................................................................ 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 5
2.4 Flammable products ........................................................................................................ 7
2.5 Equipment category .........................................................................................................7
2.6 Protection types................................................................................................................ 8
2.6.1 Protection types for the compact version .............................................................................. 8
2.6.2 Protection types for the remote version................................................................................. 8
2.7 Ambient temperature / temperature classes.................................................................. 9
2.8 Electrical data................................................................................................................. 12
3 Installation 13
3.1 Special conditions........................................................................................................... 13
3.2 Installation...................................................................................................................... 13
4 Electrical connections 14
4.1 General notes ................................................................................................................. 14
4.2 Power supply .................................................................................................................. 14
4.3 Inputs / outputs .............................................................................................................. 14
4.4 Grounding and equipotential bonding............................................................................ 15
4.5 Sensor circuits (remote version only)............................................................................ 16
5 Operation 17
5.1 Start-up........................................................................................................................... 17
5.2 Operation ........................................................................................................................ 17
5.3 Electrostatic charge .......................................................................................................17
6 Service 18
6.1 Maintenance ................................................................................................................... 18
6.2 Dismantling .................................................................................................................... 18

SAFETY INSTRUCTIONS 1
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1.1 General notes
These additional Ex instructions apply to explosion-protected versions of the vortex flowmeters
with the marking II 3 G. They complement the standard documentation for non-explosion
protected versions.
The information given in these Instructions contains only the data relevant to Category 3
explosion protection. The technical details given in the Installation and Operation Instructions 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
and dust.
The assessment was made according to Directive 2014/34/EU, Annex VIII (module "Internal
control of production") and is registered company-internal under KMT-TDZ-A091X. This
registration number is also provided on the nameplate.
1.3 Safety instructions
If these instructions are not followed, there is a risk of explosion.
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
Operating conditions and place of installation may require compliance with additional standards,
directives or laws. The responsibility for compliance rests solely with the operator or his agent.

2 DEVICE DESCRIPTION
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2.1 Device description
Vortex flowmeters measure and display the volume flow of flammable and non-flammable gases
and liquids. The display unit contains a 4...20 mA signal output with optional HART
®
communication and a separate pulse/status output.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
The remote version consisting of the OPTISWIRL 4000 flow sensor and the VFC 070 F signal
converter is called the OPTISWIRL 4070 F.
Compact device
1 Product designation
2 Type series
3 Compact measuring device
4 Marking without influence on the explosion safety protection
Signal converter remote version
1 Product designation
2 Type series
3 Remote version
4 Marking without influence on the explosion safety protection
Sensor remote version
1 Product designation
2 Type series sensor
3 Marking without influence on the explosion safety protection

DEVICE DESCRIPTION 2
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2.3 Marking
The marking key is used to mark the devices using the nameplates as illustrated here. On both
the compact devices and the remote versions, the main plate is located on the converter
housing. On the remote versions there is an additional marking on the flow sensor.
Compact devices with two signal converters for dual measurement (Dual Version) are each
marked with a nameplate, which is affixed to each of the converter housings. The details relevant
to explosion protection are identical on both nameplates.
Compact version
1 Product designation
2 Materials of flow sensor and sealing
3 Serial number
4 Year of manufacture
5 Ex data
6 PED data
7 Circuits
8 Observe operating instructions
9 Manufacturer's website

2 DEVICE DESCRIPTION
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Remote version
1 Product designation
2 Materials of flow sensor and sealing
3 Serial number
4 Year of manufacture
5 Ex data
6 PED data
7 Circuits
8 Observe operating instructions
9 Manufacturer's website

DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions.
It is defined by the following values T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar /
11.6...15.9 psi.
Outside of this range, for most mixtures no key figures are available for the ignition behaviour.
Operating conditions
Vortex flowmeters operate outside of atmospheric conditions, which means that explosion
protection according to the ATEX directive, regardless of the zone assignment, is fundamentally
not applicable due to the lack of key safety data for the interior of the measuring section.
2.5 Equipment category
The vortex flowmeters are designed in category II 3 G according to EN 60079-0, 60079-11 and
EN 60079-15 for use in zone 2.
For more information refer to chapter "Flammable products".
CAUTION!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
to ensure that the flowmeter is operated safely in terms of the temperature and pressure of the
products used.
In case of operation with flammable products the measuring units must be included in the
periodic pressure tests of the system.
INFORMATION!
Definition of zone 2 according to EN 1127-1, Appendix B:
An area in which an explosive atmosphere as a result of the mixture of flammable substances in
the form of gas, steam or mist with air is not expected to occur under normal operation. If,
however, such an atmosphere does occur it only lasts for a brief period of time.

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2.6 Protection types
2.6.1 Protection types for the compact version
The vortex flowmeter is designed in the "non-sparking" protection type in accordance with
EN 60079-15. Explosion protection is ensured in that there are no contacts or hot surfaces with a
sparking effect during operation.
2.6.2 Protection types for the remote version
The vortex signal converter is designed in the "non-sparking" protection type in accordance with
EN 60079-15. The vortex flow sensor and its connecting line are designed as "intrinsically safe
protection level ic". Explosion protection for the signal converter is ensured in that there are no
contacts or hot surfaces with a sparking effect during operation. With the flow sensor, the
limiting of current and voltage also ensures that no energy capable of ignition can occur.
The marking is: II 3G Ex nA II T4...T1 Gc
II 3G Ex nA II T4...T1 GcII 3G Ex nA II T4...T1 Gc
II 3G Ex nA II T4...T1 Gc
II
IIII
II Group II explosion protection
3
33
3Equipment category 3
G
GG
GGas explosion protection
nA
nAnA
nA Non-sparking equipment
II
IIII
II Gas groups IIA, IIB, IIC
T4...T1
T4...T1T4...T1
T4...T1 Temperature classes T4...T1
The marking on the signal converter acc. to ATEX is: II 3G Ex na [ic] IIC T4 Gc
II 3G Ex na [ic] IIC T4 GcII 3G Ex na [ic] IIC T4 Gc
II 3G Ex na [ic] IIC T4 Gc
II
IIII
II Group II explosion protection
3
33
3Equipment category 3
G
GG
GGas explosion protection
nA
nAnA
nA Non-sparking equipment
[ic]
[ic][ic]
[ic] Appropriate intrinsically safe sensor circuit
IIC
IICIIC
IIC Gas groups IIA, IIB, IIC
T4
T4T4
T4 Temperature classes T4...T1
The marking on the flow sensor acc. to ATEX is: II 3G Ex ic IIC T4...T1 Gc
II 3G Ex ic IIC T4...T1 GcII 3G Ex ic IIC T4...T1 Gc
II 3G Ex ic IIC T4...T1 Gc
II
IIII
II Group II explosion protection
3
33
3Equipment category 3
G
GG
GGas explosion protection
ic
icic
ic Intrinsically safe equipment, protection level ic
IIC
IICIIC
IIC Gas groups IIA, IIB, IIC
T4...T1
T4...T1T4...T1
T4...T1 Temperature classes T4...T1

DEVICE DESCRIPTION 2
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2.7 Ambient temperature / temperature classes
The permissible range of ambient temperatures for vortex flowmeters is noted on the nameplate
and is T
amb
=-40°C...+60°C/-40°F...+140°F
Because of the influence of the temperature of the product, no fixed temperature class is
assigned to vortex flowmeters. In fact, the temperature class of a device is a function of the
temperature of both the product and the environment, as well as the size of the measuring units.
The classification for the respective version is outlined in the following tables.
Regardless of the temperature class, the lower limit value for the product temperature is
T
M
=-40°C/-40°F for all versions.
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under the
following conditions:
• The measuring device is installed and operated in accordance with the installation
instructions in the standard documentation.
• It must be ensured that the flowmeter is not heated by the effects of additional heat radiation
(sunshine, neighbouring system components) and thus operated above the permissible
ambient temperature range.
• Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.

2 DEVICE DESCRIPTION
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Permissible product and ambient temperatures with signal converter or sensor connection box
Permissible product and ambient temperatures with signal converter or sensor connection boxPermissible product and ambient temperatures with signal converter or sensor connection box
Permissible product and ambient temperatures with signal converter or sensor connection box
installed above the measuring unit
installed above the measuring unitinstalled above the measuring unit
installed above the measuring unit
As shown in the figure below, the measuring device should be installed so that it is protected
from direct sunlight.
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T4 T3 T2…T1
T
amb
in °C50 60 40 50 60 40 50 60
Size
DN15…25 110 110 175 175 1 125 1 235 1 180 1 125 1
DN40 …50 110 110 175 165 115 215 165 115
DN65…100 110 110 175 155 110 200 155 110
DN150...300 110 110 175 175 130 1 240 1 190 1 130 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T4 T3 T2…T1
T
amb
in °F122 140 104 122 140 104 122 140
Size
DN15 …25 230 230 347 347 1 257 1 455 1 356 1 257 1
DN40…50 230 230 347 329 239 419 329 239
DN65…100 230 230 347 311 230 392 311 230
DN150...300 230 230 347 347 266 1 464 1 374 1 266 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

DEVICE DESCRIPTION 2
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Permissible product and ambient temperatures with signal converter / sensor
connection box installed laterally or below the measuring unit
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Maximum permissible product and ambient temperatures for devices with painted
measuring unit (all sizes)
Temperature class T4 T3 T2…T1
T
amb
in °C50 60 40 50 60 40 50 60
Size
DN15…25 110 110 175 175 1 145 1 240 1 205 1 145 1
DN40 …50 110 110 175 175 1 135 1 240 1 205 1 135 1
DN65…100 110 110 175 175 1 130 1 240 1 195 1 130 1
DN150...300 110 110 175 175 1 150 1 240 1 235 1 150 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T4 T3 T2…T1
T
amb
in °F122 140 104 122 140 104 122 140
Size
DN15…25 230 230 347 347 1 293 1 464 1 401 1 293 1
DN40…50 230 230 347 347 1 275 1 464 1 401 1 275 1
DN65…100 230 230 347 347 1 266 1 464 1 383 1 266 1
DN150...300 230 230 347 347 1 302 1 464 1 455 1 302 1
1Permanent service temperature of connecting cable and cable entry min. 176°F
Temp. class T4…T1
T
amb
in 60°C140°F
T
M
90°C194°F

2 DEVICE DESCRIPTION
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2.8 Electrical data
Signal circuits
Signal circuitsSignal circuits
Signal circuits
The vortex flowmeter signal circuits may only be connected to circuits with the following nominal
values:
A+/A
•U = 14...36 V
•I = 4...20 mA
B+/B
•U
max
=36V
•I
max
= 100 mA
Sensor circuits
Sensor circuitsSensor circuits
Sensor circuits
With the compact device, the sensor circuits are designed as internal circuits.
When it comes to the remote versions, the intrinsically safe sensor circuits are led through.

INSTALLATION 3
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3.1 Special conditions
Equipotential bonding
Vortex flowmeter converters must be included in the equipotential bonding of the hazardous
area.
3.2 Installation
Installation 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 manuals and the supplementary instructions must be observed at all times.
Vortex flowmeters must be installed in such a way that
•There are no external forces affecting the indicator part.
•The device is accessible for any visual inspections that are necessary, and can be viewed from
all sides.
•The nameplate is clearly visible.
•It can be operated from a location with secure footing.
Converter alignment
The converter may be aligned on the base in 90°increments up to a maximum of ±180°.
For this reason, the four M6 hexagon socket screws connecting the base and the converter must
be loosened. Once the converter has been turned, it must be screwed back on to the base again
(tightening torque 6 Nm).
•De-energise the converter.
•Loosen the 4 hexagon socket screws.
•Turn the converter.
•Screw base to converter once again.
1Screws used to assemble base and converter
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose. This applies in particular to hazards due to insufficient corrosion resistance
and suitability of the materials in contact with product.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
The separate signal circuits are electrically connected in the terminal compartment of the signal
converter. The separate sensor circuits are connected in the terminal compartments on the wall
bracket and flow sensors.
The connecting cables for signal circuits must be selected and connected according to prevailing
installation standards (e.g. EN 60079-14). The connecting cable for the sensor is included in
delivery.
•The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
•Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
•The outer diameter of the connecting cable must be within the sealing range of the cable
entry (10...14 mm / 0.4...0.55").
•Unused cable entries are to be closed (>IP67).
Ensure that the seals and cut seals are tight.
4.2 Power supply
Vortex flowmeters do not require a separate power supply. The required supply is provided via
the 4...20 mA current output.
4.3 Inputs / outputs
When connecting the vortex flowmeters, observe the following points:
•Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
•All cores and shields belonging to the connecting cables that are not securely fitted to the
equipotential bonding of the hazardous area are to be carefully isolated from each other and
from ground (test voltage 500 V
eff
).
•Any existing cable shields should be connected via the shortest way to the connection
terminal (PA) provided in the terminal compartment. In the case of shield earthing at both
ends (e.g. for reasons of electromagnetic compatibility), adequate equipotential bonding
between the two shield connectors is necessary to avoid excessive equalising current.
•Equipment may only be connected to the signal outputs when taking into account the
maximum permissible values. The signal outputs must be connected to separate circuits.
The current output is electrically isolated from the pulse/status output. Both circuits are
electrically isolated from the earth.

ELECTRICAL CONNECTIONS 4
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4.4 Grounding and equipotential bonding
In the case of compact meters and measuring units with flange connections, the sensor is
conductively connected to the pipeline. For compact measuring devices and "sandwich" type
measuring units, a separate conductor connected to the external PA terminal must be provided
to connect to the equipotential bonding.
Remote systems can either be included in the equipotential bonding via the PA connection in the
converter's terminal compartment or via the external PA connection on the wall bracket.
CAUTION!
Equipotential bonding
Equipotential bondingEquipotential bonding
Equipotential bonding
Vortex signal converters must be included in on-site equipotential bonding acc. to EN 60079-14!
They are connected to the PA terminals.
1 Terminal compartment closed
2 Terminal compartment open
3 Connection A: Current output 4...20 mA (-)
4 Connection A+: Current output 4...20 mA (+)
5 Connection B: pulse / status output (-)
6 Connection B+: pulse / status output (+)
7 PA connection inside
8 PA connection outside

4 ELECTRICAL CONNECTIONS
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4.5 Sensor circuits (remote version only)
Observe the following points when connecting the flow sensor to the signal converter:
•Use only the supplied connecting cable (max. length 15 m / 49 ft).
•Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
•Connect the connecting cable shield to the equipotential bonding of the hazardous area using
the stress resisting clamp in the wall bracket. Sensor-side, the shield must be carefully
isolated from the earth.
(test voltage 500 V
eff
).
•The pressure transmitter circuit (pressure, terminals 1-5) and the piezo / Pt1000 circuit
(piezo, terminals 1-3 and Pt1000, terminals 1-2) are to be electrically isolated from one
another and from the earth along the complete length up to the connections in the wall
bracket.
The separate sensor circuits are designed in protection type "intrinsically safe" Ex ic IIC.

OPERATION 5
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5.1 Start-up
Start-up may only commence when the vortex flowmeter:
•is correctly installed in the system 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.
If the device needs to be configured due to the existence of an explosive atmosphere, this can be
done using the supplied programming magnets. There is no need to open the housing as it can
be done through the glass window of the electronics compartment or digitally via the signal
output (HART
®
interface).
5.2 Operation
Vortex flowmeters must be operated in such a way that they remain within the maximum and
minimum permissible temperatures and pressures and the electrical limit values.
Vortex flowmeters may only be operated if the equipment parts necessary for safety are effective
in the long run, and are not rendered inoperable during operation.
When it comes to flammable products, the measuring sections must be included in the periodic
pressure tests of the system.
Terminal compartments may be opened even in an energised state in hazardous areas. Work on
electrical connections (e.g. configuration via the HART
®
interface) is also permitted in an
energised state. Terminal compartments must be closed immediately upon completion of the
work.
5.3 Electrostatic charge
In order to avoid ignition hazards due to electrostatic charge, vortex flowmeters may
not be used in areas with:
•processes that generate strong charges,
•mechanical friction and cutting processes,
•spraying of electrons (e.g. in the vicinity of electrostatic painting systems) or
•pneumatically conveyed dust is exposed.
CAUTION!
Electrostatic charging of the housing surface by friction must be avoided. The devices must not
be dry cleaned.

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:
•Checking the housing, the cable entries and the feed lines for corrosion and/or damage.
•Checking the measuring unit and the piping connections for leakage.
•Checking the measuring unit and the indicator for dust deposits.
6.2 Dismantling
General notes
The cover must be opened using a suitable tool (e.g. strap wrench) to avoid damage to the cover.
If at all possible, the meter should be electrically isolated before removing and replacing the
indicator. If that 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.
After opening the converter, grease the converter's cover threads including the cover seals if
necessary.
Display
The display can be rotated in 90°increments. It is connected to the connector pictured on the
next page.
Exchanging the converter insert
It is permitted to replace the entire VFC070 signal converter insert with a version identical in
construction.
CAUTION!
Converter inserts operated with non-intrinsically safe power supplies may not be installed in
equipment belonging to equipment category II 2 G.

SERVICE 6
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Take special note of the following figure and:
•ensure that the construction is the same by checking the nameplates.
•the connecting cable of the sensor circuits is to be laid in the cutout provided on the printed
circuit board. Avoid damage such as that caused by crushing.
•proper connection of the measuring sensor 3and the display connector 1
•tighten the mounting screws M4 5evenly
Exchanging the entire device
Removal and installation are the responsibility of the operator.
Before disconnecting the electric connecting cable of the device, make sure that all cables
leading to the indication unit are isolated from the ground of the hazardous area. This also
applies to functional earthing conductors (FE) and equipotential bonding conductors (PA).
1 Display connection
2 Version number, software
3 Sensor connection
4 Mounting bolts, display
5 Mounting screw device insert
6 Nameplate device insert
CAUTION!
• Pressurised pipes have to be depressurized before removing the measuring unit.
• In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
• New gaskets have to be used when re-installing the device in the piping.

KROHNE –Process instrumentation and measurement solutions
• Flow
• Level
• Temperature
• Pressure
• Process Analysis
• Services
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
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