KROHNE OPTISWIRL 4200 Wiring diagram

Vortex flowmeter
Category II 2G, EPL Gb
OPTISWIRL 4200
OPTISWIRL 4200OPTISWIRL 4200
OPTISWIRL 4200 Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
© KROHNE 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD R01 en

CONTENTS
2
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
OPTISWIRL 4200
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Security information......................................................................................................... 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 7
2.5 Equipment category / EPL................................................................................................ 7
2.6 Protection types................................................................................................................ 8
2.7 Ambient temperature / temperature classes.................................................................. 8
2.8 Electrical data................................................................................................................. 14
3 Installation 15
3.1 Installation...................................................................................................................... 15
3.2 Special conditions........................................................................................................... 16
4 Electrical connections 17
4.1 General notes ................................................................................................................. 17
4.2 Power supply .................................................................................................................. 17
4.3 Inputs / Outputs .............................................................................................................. 17
4.4 Grounding and equipotential bonding............................................................................ 18
4.5 Measuring sensor circuits (remote version only).......................................................... 19
5 Operation 21
5.1 Start-up........................................................................................................................... 21
5.2 Operation ........................................................................................................................ 21
5.3 Electrostatic charge .......................................................................................................21
6 Service 22
6.1 Maintenance ................................................................................................................... 22
6.2 Dismantling .................................................................................................................... 22

SAFETY INSTRUCTIONS 1
3
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
1.1 General notes
These additional instructions apply to explosion-protected versions of vortex flowmeters with
protection type intrinsic safety "i", equipment category II 2 G and EPL Gb. They complete the
installation and operating instructions for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to explosion
protection. The technical details given in the manual for the non-explosion protected versions
apply unchanged unless excluded or superseded by these instructions.
1.2 EC conformity
The manufacturer declares with the EC declaration of conformity on his own responsibility
conformity with the protection goals of directive 94/9/EC for use in hazardous areas with gas.
The EC declaration of conformity for the equipment category II 2 G is based on the EC type
examination certificate of the KIWA ExVision:
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 of the vortex flowmeter for use in hazardous areas with gas was tested in accordance
with the IECEx Certification Scheme for Explosive Atmospheres acc. to IEC 60079-0 and
IEC 60079-11. 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.
KIWA 14 ATEX 0017 X
KIWA 14 ATEX 0017 XKIWA 14 ATEX 0017 X
KIWA 14 ATEX 0017 X
IECEx KIWA 15.0003X
IECEx KIWA 15.0003XIECEx KIWA 15.0003X
IECEx KIWA 15.0003X

1 SAFETY INSTRUCTIONS
4
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
1.4 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation. This applies particularly for the
use of easy detachable process connections such as SMS or Clamp when measuring flammable
mediums.

DEVICE DESCRIPTION 2
5
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
2.1 Device description
Vortex flowmeters measure and display the flow of flammable and non-flammable gases and
liquids. The signal converter includes either a 4...20 mA signal output with optional HART
®
communication or a bus connection. There are bus connections available according to the FISCO
model for connecting to the Foundation Fieldbus or Profibus PA. Signal converters with signal
output have a separated binary output and current input.
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 F measuring sensor and the VFC 200 F
signal converter is called the OPTISWIRL 4200 F.
Compact device
1 Product description
2 Type series
3 Compact measuring device
4 Electrical signal output
Free - current output 4...20 mA with optional HART
®
communication or
FF - Foundation FIELDBUS bus connection or
PA - PROFIBUS PA bus connection
5 Intrinsically safe supply
6 Ex - Explosion-protected version
Signal converter remote version
1 Product description
2 Type series
3 Remote version
4 Electrical signal output
Free - current output 4...20 mA with optional HART
®
communication or
FF - Foundation FIELDBUS bus connection or
PA - PROFIBUS PA bus connection
5 Intrinsically safe supply
6 VFC020 sensor electronics
7 Ex - Explosion-protected version
Measuring sensor remote version
1 Product description
2 Type series sensor
3 Remote version

2 DEVICE DESCRIPTION
6
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
2.3 Marking
The marking of the devices in accordance with the description code is shown on the nameplates
below. 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 measuring
sensor.
Compact devices with two 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.
1 Device version OPTISWIRL 4200 C or VFC 200 F ... 020 / OPTISWIRL 4000 F
2 Production order number
3 Serial number
4 Year of manufacture
5 Ex data acc. to KIWA 14 ATEX 0017 X bzw. IECEx KIWA 15.0003X
6 Permissible ambient temperature range
7 Maximum values intrinsically safe circuits
8 Observe the safety instructions
9 Internet address of the manufacturer

DEVICE DESCRIPTION 2
7
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
2.4 Flammable products
Atmospheric conditions
An explosive atmosphere is defined as a mixture of air and flammable gases, vapours, mists or
dusts under atmospheric conditions with the values
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar.
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Operating conditions
Vortex flowmeters operate outside of atmospheric conditions, which means that explosion
protection according to Directive 94/9/EC (ATEX) –regardless of the zone assignment –is
fundamentally not applicable due to the lack of key safety data for the interior of the measuring
unit.
2.5 Equipment category / EPL
Vortex flowmeters are designed in category II 2 G and EPL Gb according to EN 60079-0 and EN
60079-11 for use in zone 1. The inside of the measuring unit is also permitted for zone 1.
Vortex flowmeters are designed according to the "IECEx-Scheme" acc. to "Equipment Protection
Level [EPL] Gb".
WARNING!
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
for ensuring that the flowmeter is operated safely as regards 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 1 acc. to EN 1127-1, Appendix B:An area in which an explosive atmosphere
may occasionally occur as a result of the mixture of flammable substances in the form of gas,
steam or mist with air under normal operation.

2 DEVICE DESCRIPTION
8
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
2.6 Protection types
2.7 Ambient temperature / temperature classes
Because of the influence of the temperature of the product, no fixed temperature class is
assigned to vortex flowmeters. The temperature class of these devices is rather a function of the
product temperature and ambient temperature that is present and the specific device version.
The classification is outlined in the following tables.
The tables take into account the following parameters:
•Ambient temperature T
amb
•Product temperature T
m
•Nominal size DN
•Heat resistance of the connecting cable
The marking acc. to
ATEX is: II 2 G Ex ia IIC T6...T2 Gb
II 2 G Ex ia IIC T6...T2 GbII 2 G Ex ia IIC T6...T2 Gb
II 2 G Ex ia IIC T6...T2 Gb
IECEx is: Ex ia IIC T6...T2 Gb
Ex ia IIC T6...T2 GbEx ia IIC T6...T2 Gb
Ex ia IIC T6...T2 Gb
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, level of protection "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T6...T2
T6...T2T6...T2
T6...T2 Temperature class range
Gb
GbGb
Gb EPL, suitable for zone 1
INFORMATION!
In principle, operation is possible in all ranges of the temperature classes T1...T6.

DEVICE DESCRIPTION 2
9
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
The permitted ambient temperature range is indicated on the nameplate; depending on the
device version it is T
amb
= -40...+65°C / -40...+149°F
The minimum product temperature is -40°C / -40°F.
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 manufacturer's
installation instructions.
• 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 signal converter
must be ensured.

2 DEVICE DESCRIPTION
10
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
Maximum permissible product and ambient temperatures with signal converter or connection
Maximum permissible product and ambient temperatures with signal converter or connectionMaximum permissible product and ambient temperatures with signal converter or connection
Maximum permissible product and ambient temperatures with signal converter or connection
box mounted above the measuring sensor
box mounted above the measuring sensorbox mounted above the measuring sensor
box mounted above the measuring sensor
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T6 T5 T4 T3 T2
T
amb
in °C40 60 60 65 40 60 65 40 60 65
Nominal size
DN15 …25 85 65 135 135
1
200 200 1 185 1 240 210 1 185 1
DN40 …50 75 65 135 135
1
200 195 1 165 1 240 195 1 165 1
DN80 …100 70 65 135
1
135
1
200 165 1 145 1 240 1 165 1 145 1
DN150 ... 300 80 65 135 135
1
200 200 1 170 1 240 200 1 170 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2
T
amb
in °F104 140 140 149 104 140 149 104 140 149
Nominal size
DN15 …25 185 149 275 275
1
392 392 1 365 1 464 410 1 365 1
DN40 …50 167 149 275 275
1
392 383 1 329 1 464 383 1 329 1
DN80 …100 158 149 275
1
275
1
392 329 1 293 1 464 1 329 1 293 1
DN150 ... 300 176 149 275 275
1
392 392 1 338 1 464 392 1 338 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

DEVICE DESCRIPTION 2
11
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
Maximum permissible product and ambient temperatures with signal converter or connection
Maximum permissible product and ambient temperatures with signal converter or connectionMaximum permissible product and ambient temperatures with signal converter or connection
Maximum permissible product and ambient temperatures with signal converter or connection
box mounted at side or underneath the measuring sensor
box mounted at side or underneath the measuring sensorbox mounted at side or underneath the measuring sensor
box mounted at side or underneath the measuring sensor
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T6 T5 T4 T3 T2
T
amb
in °C40 60 60 65 40 60 65 40 60 65
Nominal size
DN15 …25 85 65 135 135 200 200 200 1 240 240 240 1
DN40 …50 75 65 135 135 200 200 200 1 240 240 240 1
DN80 …100 70 65 135 135
1
200 200 1 200 1 240 240 1 240 1
DN150 ... 300 80 65 135 135 200 200 200 1 240 240 240 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2
T
amb
in °F104 140 140 149 104 140 149 104 140 149
Nominal size
DN15 …25 185 149 275 275 392 392 392 1 464 464 464 1
DN40 …50 167 149 275 275 392 392 392 1 464 464 464 1
DN80 …100 158 149 275 275
1
392 392 1 392 1 464 464 1 464 1
DN150 ... 300 176 149 275 275 392 392 392 1 464 464 464 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

2 DEVICE DESCRIPTION
12
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
Maximum permissible product and ambient temperatures for devices with painted measuring
Maximum permissible product and ambient temperatures for devices with painted measuringMaximum permissible product and ambient temperatures for devices with painted measuring
Maximum permissible product and ambient temperatures for devices with painted measuring
sensors / signal converters or connection box mounted above the measuring sensor
sensors / signal converters or connection box mounted above the measuring sensorsensors / signal converters or connection box mounted above the measuring sensor
sensors / signal converters or connection box mounted above the measuring sensor
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T6 T5 T4 T3 T2
T
amb
in °C40 60 60 65 40 60 65 40 60 65
Nominal size
DN15 …25 60 60 120
1
120
1
120 120 1 120 1 120 120 1 120 1
DN40 …50 55 60 120
1
115
1
120 120 1 115 1 120 120 1 115 1
DN80 …100 55 60 110
1
105
1
120 110 1 105 1 120 110 1 105 1
DN150 ... 300 60 60 120
1
115
1
120 120 1 115 1 120 120 1 115 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2
T
amb
in °F104 140 140 149 104 140 149 104 140 149
Nominal size
DN15 …25 140 140 248
1
248
1
248 248 1 248 1 248 248 1 248 1
DN40 …50 131 140 248
1
239
1
248 248 1 239 1 248 248 1 239 1
DN80 …100 131 140 230
1
221
1
248 230 1 221 1 248 230 1 221 1
DN150 ... 300 140 140 248
1
239
1
248 248 1 239 1 248 248 1 239 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

DEVICE DESCRIPTION 2
13
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
Maximum permissible product and ambient temperatures for devices with painted measuring
Maximum permissible product and ambient temperatures for devices with painted measuringMaximum permissible product and ambient temperatures for devices with painted measuring
Maximum permissible product and ambient temperatures for devices with painted measuring
sensors / signal converters or connection box mounted at side or underneath the measuring
sensors / signal converters or connection box mounted at side or underneath the measuringsensors / signal converters or connection box mounted at side or underneath the measuring
sensors / signal converters or connection box mounted at side or underneath the measuring
sensor
sensorsensor
sensor
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T6 T5 T4 T3 T2
T
amb
in °C40 60 60 65 40 60 65 40 60 65
Nominal size
DN15 …25 85 65 120 120
1
120 120 120 1 120 120 120 1
DN40 …50 70 65 120
1
120
1
120 120 1 120 1 120 120 1 120 1
DN80 …100 70 65 120
1
120
1
120 120 1 120 1 120 120 1 120 1
DN150 ... 300 75 65 120 120
1
120 120 120 1 120 120 120 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2
T
amb
in °F104 140 140 149 104 140 149 104 140 149
Nominal size
DN15 …25 185 149 248 248
1
248 248 248 1 248 248 248 1
DN40 …50 158 149 248
1
248
1
248 248 1 248 1 248 248 1 248 1
DN80 …100 158 149 248
1
248
1
248 248 1 248 1 248 248 1 248 1
DN150 ... 300 167 149 248 248
1
248 248 248 1 248 248 248 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

2 DEVICE DESCRIPTION
14
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
2.8 Electrical data
Signal circuits
Signal circuitsSignal circuits
Signal circuits
The vortex flowmeter signal circuits may only be connected to separate, certified, intrinsically
safe isolating amplifiers or zener barriers connected to separate, intrinsically safe circuits with
the following maximum values per circuit:
Measuring sensor circuits
Measuring sensor circuitsMeasuring sensor circuits
Measuring sensor circuits
With the compact device, the intrinsically safe measuring sensor circuits are designed as
internal circuits.
When it comes to the remote versions, the intrinsically safe measuring sensor circuits are led
through. The maximum permissible values of the measuring sensor circuits considered safe are
listed below:
Pressure sensor circuit (connector X2.1 .. X2.5)
Pressure sensor circuit (connector X2.1 .. X2.5)Pressure sensor circuit (connector X2.1 .. X2.5)
Pressure sensor circuit (connector X2.1 .. X2.5)
•U
o
=6,65V
•I
o
=35mA
•P
o
=58mW
•C
o
=2,5µF
•L
o
=0,5mH
Piezo / Temperature sensor circuit (connector X2.7 .. X2.12
Piezo / Temperature sensor circuit (connector X2.7 .. X2.12Piezo / Temperature sensor circuit (connector X2.7 .. X2.12
Piezo / Temperature sensor circuit (connector X2.7 .. X2.12
•U
o
=6,65V
•I
o
=21mA
•P
o
=35mW
•C
o
=2,6µF
•L
o
=0,5mH
Device version Maximum values
Circuit
Terminals
U
i
[V] Ii[mA] P
i
[W] C
i
[nF] L
i
[μH]
OPTISWIRL 4200 C i Ex
VFC 200 F i Ex
Current output 4-20 mA
C1, C2 30 130 110 ~ 0
Binary output
M1, M2, M3, M4 30 100 110 ~ 0
Current input
I1, I2 30 130 115 ~ 0
OPTISWIRL 4200 C FF i Ex
VFC 200 F FF i Ex Bus terminal D, D- 24 380 5.32 ~ 0 ~ 0
OPTISWIRL 4200 C PA i Ex
VFC 200 F PA i Ex Bus terminal D, D- 24 380 5.32 ~ 0 ~ 0

INSTALLATION 3
15
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
3.1 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
•no external forces are affecting the indication unit.
•the device is accessible for any necessary visual inspections and can be viewed from all sides.
•the nameplate is clearly visible.
•it can be operated from a location with secure footing.
Aligning the signal converter
The signal converter and the connection box of remote systems may be aligned on the base up to
a maximum of ±180°. For this reason, the M4 hexagon socket screw connecting the base, the
converter and connection box must be loosened. Once the signal converter and the connection
box has been turned, it must be screwed back on to the base again (tightening torque 2 Nm).
•De-energise the converter.
•Loosen the 1 hexagon socket screw.
•Turn the signal converter and connection box.
•Screw base to signal converter and the connection box once again.
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.
1Allen screws M4 on connection housing

3 INSTALLATION
16
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
3.2 Special conditions
Equipotential bonding
Vortex flowmeter converters and measuring sensors with optional pressure sensor (remote
system only) must be included in the equipotential bonding of the hazardous area.
INFORMATION!
Lock on electronics and terminal compartment
Lock on electronics and terminal compartmentLock on electronics and terminal compartment
Lock on electronics and terminal compartment
The electronics and terminal compartment may be opened in hazardous areas when measuring
and carrying out adjustments.

ELECTRICAL CONNECTIONS 4
17
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
4.1 General notes
The separate intrinsically safe signal circuits are electrically connected in the terminal
compartment of the signal converter. The circuits are designed in protection type "intrinsically
safe" and galvanically isolated from ground (test voltage ≥500 V
eff
).
The intrinsically safe measuring sensor circuits are connected in the connection boxes on the
wall bracket and measuring sensor.
The connecting cables must be selected according to prevailing installation standards (e.g.
EN 60079-14) and the maximum operating temperature.
The connecting cable between the measuring sensor and wall bracket with remote systems is
part of the supply.
•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)
•Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring sensor and the connecting cable.
•Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(protection category) IP66 / 67 according to EN 60529.
•Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
•Any existing cable shields should be connected to ground according to applicable installation
regulations (EN 60079-14). A terminal in the terminal compartment permits a short way
grounding of the cable shields.
•The outer diameter of the connecting cable must be within the sealing range of the cable
entry (6...12 mm / 0.24...0.47").
•Unused cable entries are to be closed.
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 for the built-in
electronics is provided via the 4...20mA current output or the bus connection.
4.3 Inputs / Outputs
The terminal assignment is described in the standard documentation. The signal circuits of the
vortex flowmeters may only be connected to certified intrinsically safe slave units or circuits. For
more information refer to chapter "Electrical data".
The current output, the current input and the binary output are designed for connection to a
certified, intrinsically safe circuit, protection type: intrinsic safety Ex ia IIC or Ex ib IIC.
The bus connections are designed for connection to a certified, intrinsically safe circuit,
protection type: intrinsic safety Ex ia IIC or Ex ib IIC according to the FISCO model.

4 ELECTRICAL CONNECTIONS
18
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
The current output, the current input and the binary output are reliably separated up to a peak
voltage of 60 V. All signal circuits are electrically isolated from the earth.
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 either to the internal or external PA terminal
must be provided to connect to the equipotential bonding.
For remote systems with pressure sensor, the connection of the measuring sensor can either be
made via the PA connection in the converter's terminal compartment or via the external PA
connection.
CAUTION!
Equipotential bonding
Equipotential bondingEquipotential bonding
Equipotential bonding
Vortex signal converters and measuring senors in the remote version with pressure sensor must
be included in on-site equipotential bonding system acc. to EN60079-14! They are connected to
the PA terminals.
Ground connection compact version
1 Electrical grounding connection on connection piece between measuring sensor and signal converter.
2 Electrical grounding terminal in the housing
Ground connection remote version
1 Electrical grounding connection on measuring sensor
2 Electrical grounding connection on signal converter housing

ELECTRICAL CONNECTIONS 4
19
OPTISWIRL 4200
www.krohne.com05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
4.5 Measuring sensor circuits (remote version only)
Observe the following points when connecting the measuring sensor to the signal converter:
•Use only the supplied connecting cable (max. length 50 m / 164 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 in the
wall bracket. Sensor-side, the shield must be carefully isolated from the earth (test voltage
500 V
eff
) and connected via the cable shoe to the corresponding connector on the terminal
block.
•The terminal compartments of the measuring sensor circuits are supplied with a bridge
between the internal PA connection and the terminal with the designation "gnye". This
connection must not be separated.

4 ELECTRICAL CONNECTIONS
20
OPTISWIRL 4200
www.krohne.com 05/2015 - 4004274301 - MA OPTISWIRL 4200-Exi-II2G-AD
The measuring sensor circuit is designed in protection type intrinsically safe Ex ia II C.
Figure 4-1: Connection of remote version
1 Terminal connection measuring sensor
2 Terminal connection signal converter
3 Terminal end pair shielding measuring sensor
4 Filler wire pair shielding (protected with heat shrink tubing)
5 Fork clamp pair shielding signal converter side
6 Heat shrink tubing