Vega VEGABAR 83 User manual

Operating Instructions
Pressure transmitter with metallic
measuring cell
VEGABAR 83
Modbus and Levelmaster protocol
Document ID: 46295

2
Contents
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
Contents
1 About this document ............................................................................................................... 4
1.1 Function ........................................................................................................................... 4
1.2 Target group ..................................................................................................................... 4
1.3 Symbols used................................................................................................................... 4
2 For your safety ......................................................................................................................... 5
2.1 Authorised personnel ....................................................................................................... 5
2.2 Appropriate use................................................................................................................ 5
2.3 Warning about incorrect use............................................................................................. 5
2.4 General safety instructions............................................................................................... 5
2.5 EU conformity................................................................................................................... 5
2.6 NAMUR recommendations .............................................................................................. 6
2.7 Installation and operation in the USA and Canada ........................................................... 6
2.8 Environmental instructions ............................................................................................... 6
3 Product description ................................................................................................................. 7
3.1 Conguration.................................................................................................................... 7
3.2 Principle of operation........................................................................................................ 8
3.3 Supplementary cleaning procedures.............................................................................. 11
3.4 Packaging, transport and storage................................................................................... 11
3.5 Accessories.................................................................................................................... 12
4 Mounting................................................................................................................................. 14
4.1 General instructions ....................................................................................................... 14
4.2 Instructions for oxygen applications ............................................................................... 15
4.3 Ventilation and pressure compensation.......................................................................... 16
4.4 Process pressure measurement..................................................................................... 17
4.5 Level measurement........................................................................................................ 19
4.6 External housing ............................................................................................................ 19
5 Connecting to power supply and bus system .................................................................... 20
5.1 Preparing the connection ............................................................................................... 20
5.2 Connecting..................................................................................................................... 21
5.3 Wiring plan ..................................................................................................................... 23
5.4 External housing with version IP68 (25 bar) ................................................................... 24
5.5 Switch-on phase............................................................................................................. 26
6 Set up the sensor with the display and adjustment module............................................. 27
6.1 Insert display and adjustment module............................................................................ 27
6.2 Adjustment system......................................................................................................... 28
6.3 Measured value indication.............................................................................................. 29
6.4 Parameter adjustment - Quick setup .............................................................................. 30
6.5 Parameter adjustment - Extended adjustment................................................................ 30
6.6 Menu overview ............................................................................................................... 41
6.7 Save parameter adjustment data.................................................................................... 42
7 Setting up sensor and Modbus interface with PACTware.................................................. 43
7.1 Connect the PC.............................................................................................................. 43
7.2 Parameterization ............................................................................................................ 44
7.3 Set instrument address .................................................................................................. 45
7.4 Save parameter adjustment data.................................................................................... 46

3
Contents
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
8 Diagnosis, asset management and service ........................................................................ 47
8.1 Maintenance .................................................................................................................. 47
8.2 Diagnosis memory ......................................................................................................... 47
8.3 Asset Management function........................................................................................... 48
8.4 Rectify faults................................................................................................................... 50
8.5 Exchange process module on version IP68 (25 bar) ...................................................... 51
8.6 Exchanging the electronics module................................................................................ 52
8.7 Software update ............................................................................................................. 52
8.8 How to proceed if a repair is necessary.......................................................................... 53
9 Dismount................................................................................................................................. 54
9.1 Dismounting steps.......................................................................................................... 54
9.2 Disposal ......................................................................................................................... 54
10 Supplement ............................................................................................................................ 55
10.1 Technical data ................................................................................................................ 55
10.2 Device communication Modbus ..................................................................................... 69
10.3 Modbus register ............................................................................................................. 70
10.4 Modbus RTU commands ............................................................................................... 73
10.5 Levelmaster commands ................................................................................................. 75
10.6 CongurationoftypicalModbushosts ........................................................................... 78
10.7 Calculation of the total deviation..................................................................................... 79
10.8 Calculation of the total deviation - Practical example...................................................... 79
10.9 Dimensions .................................................................................................................... 81
10.10 Industrial property rights................................................................................................. 90
10.11 Trademark ...................................................................................................................... 90
Safety instructions for Ex areas:
TakenoteoftheExspecicsafetyinstructionsforExapplications.
These instructions are attached as documents to each instrument
with Ex approval and are part of the operating instructions.
Editing status: 2022-04-20

4
1 About this document
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
1 About this document
1.1 Function
This instruction provides all the information you need for mounting,
connection and setup as well as important instructions for mainte-
nance,faultrectication,theexchangeofpartsandthesafetyofthe
user. Please read this information before putting the instrument into
operation and keep this manual accessible in the immediate vicinity
of the device.
1.2 Target group
This operating instructions manual is directed to trained personnel.
Thecontentsofthismanualmustbemadeavailabletothequalied
personnel and implemented.
1.3 Symbols used
Document ID
This symbol on the front page of this instruction refers to the Docu-
ment ID. By entering the Document ID on www.vega.com you will
reach the document download.
Information, note, tip: This symbol indicates helpful additional infor-
mation and tips for successful work.
Note: This symbol indicates notes to prevent failures, malfunctions,
damage to devices or plants.
Caution: Non-observance of the information marked with this symbol
may result in personal injury.
Warning: Non-observance of the information marked with this symbol
may result in serious or fatal personal injury.
Danger: Non-observance of the information marked with this symbol
results in serious or fatal personal injury.
Ex applications
This symbol indicates special instructions for Ex applications.
• List
The dot set in front indicates a list with no implied sequence.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Disposal
This symbol indicates special instructions for disposal.

5
2 For your safety
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
2 For your safety
2.1 Authorised personnel
All operations described in this documentation must be carried out
onlybytrained,qualiedpersonnelauthorisedbytheplantoperator.
During work on and with the device, the required personal protective
equipment must always be worn.
2.2 Appropriate use
The VEGABAR 83 is a pressure transmitter for process pressure and
hydrostatic level measurement.
Youcannddetailedinformationabouttheareaofapplicationin
chapter " Product description".
Operational reliability is ensured only if the instrument is properly
usedaccordingtothespecicationsintheoperatinginstructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of this product can give rise to applica-
tion-specichazards,e.g.vesseloverllthroughincorrectmounting
or adjustment. Damage to property and persons or environmental
contamination can result. Also, the protective characteristics of the
instrument can be impaired.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and directives.The instrument must only be operated in a
technicallyawlessandreliablecondition.Theoperatorisresponsi-
ble for the trouble-free operation of the instrument.When measuring
aggressive or corrosive media that can cause a dangerous situation
if the instrument malfunctions, the operator has to implement suitable
measures to make sure the instrument is functioning properly.
The safety instructions in this operating instructions manual, the na-
tional installation standards as well as the valid safety regulations and
accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbi-
traryconversionsormodicationsareexplicitlyforbidden.Forsafety
reasons,onlytheaccessoryspeciedbythemanufacturermustbe
used.
To avoid any danger, the safety approval markings and safety tips on
the device must also be observed.
2.5 EU conformity
ThedevicefullsthelegalrequirementsoftheapplicableEUdirec-
tives.ByaxingtheCEmarking,weconrmtheconformityofthe
instrument with these directives.

6
2 For your safety
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
The EU conformity declaration can be found on our homepage.
Duetothedesignofitsprocessttings,thedevicedoesnotsubject
of EU pressure device directive if it is operated at process pressures
≤200bar.1)
2.6 NAMUR recommendations
NAMUR is the automation technology user association in the process
industry in Germany. The published NAMUR recommendations are
acceptedasthestandardineldinstrumentation.
ThedevicefullstherequirementsofthefollowingNAMURrecom-
mendations:
• NE 21 – Electromagnetic compatibility of equipment 2)
• NE53–Compatibilityofelddevicesanddisplay/adjustment
components
• NE107–Self-monitoringanddiagnosisofelddevices
For further information see www.namur.de.
2.7 Installation and operation in the USA and
Canada
This information is only valid for USA and Canada. Hence the follow-
ing text is only available in the English language.
Installations in the US shall comply with the relevant requirements of
theNationalElectricalCode(ANSI/NFPA70).
Installations in Canada shall comply with the relevant requirements of
the Canadian Electrical Code.
2.8 Environmental instructions
Protection of the environment is one of our most important duties.
That is why we have introduced an environment management system
with the goal of continuously improving company environmental pro-
tection.Theenvironmentmanagementsystemiscertiedaccording
to DIN EN ISO 14001.
Pleasehelpusfullthisobligationbyobservingtheenvironmental
instructions in this manual:
• Chapter " Packaging, transport and storage"
• Chapter " Disposal"
1) Exception:Versions with measuring ranges from 250 bar. These are subject
of the EU Pressure Device Directive.
2) Notfullledwhenconnectingtoanexternaldisplayandadjustmentunit.

7
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
3 Product description
3.1 Conguration
The scope of delivery encompasses:
• VEGABAR 83 pressure transmitter
The further scope of delivery encompasses:
• Documentation
– Quick setup guide VEGABAR 83
– Testcerticateforpressuretransmitters
– Instructions for optional instrument features
– Ex-specic"Safety instructions" (with Ex versions)
– Ifnecessary,furthercerticates
Information:
Optional instrument features are also described in this operating
instructions manual.The respective scope of delivery results from the
orderspecication.
This operating instructions manual applies to the following instrument
versions:
• Hardware from 1.0.0
• Software from 1.3.6
Note:
Youcanndthehardwareandsoftwareversionoftheinstrumentas
follows:
• On the type plate of the electronics module
• In the adjustment menu under " Info"
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
7
6
4
5
2
3
1
Fig. 1: Layout of the type label (example)
1 Product code
2 Field for approvals
3 Technical data
4 Serial number of the instrument
5 QR code
6 Symbol of the device protection class
7 ID numbers, instrument documentation
Scope of delivery
Scope of this operating
instructions
Type label

8
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
The type label contains the serial number of the instrument. With it
youcanndthefollowinginstrumentdataonourhomepage:
• Product code (HTML)
• Delivery date (HTML)
• Order-specicinstrumentfeatures(HTML)
• Operating instructions and quick setup guide at the time of ship-
ment (PDF)
• Testcerticate(PDF)-optional
Move to " www.vega.com"andenterinthesearcheldtheserial
number of your instrument.
Alternatively, you can access the data via your smartphone:
• Download the VEGA Tools app from the " Apple App Store" or the
" Google Play Store"
• Scan the QR-code on the type label of the device or
• Enter the serial number manually in the app
Theinstrumentcontainstwodierentelectronicsinitshousingcham-
bers:
• The Modbus electronics for power supply and communication with
the Modbus-RTU
• The sensor electronics for the actual measuring tasks
2
1
Fig. 2: Position of Modbus and sensor electronics
1 Modbus electronics
2 Sensor electronics
3.2 Principle of operation
VEGABAR 83 is suitable for applications in virtually all industries. It is
used for the measurement of the following pressure types.
• Gauge pressure
• Absolute pressure
• Vacuum
Measured products are gases, vapours and liquids.
The device is especially suitable for applications with higher tempera-
tures and high pressures.
The VEGABAR 83 is suitable for the measurement of the following
process variables:
• Process pressure
Serial number - Instru-
ment search
Electronics design
Application area
Measured products
Measured variables

9
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
• Level
Fig. 3: Process pressure measurement VEGABAR 83
The process pressure acts on the sensor element via the process dia-
phragm.The process pressure causes a resistance change which is
converted into a corresponding output signal and output as measured
value.
Piezoresistive sensor element
Measuring ranges up to 40 bar: piezoresistive sensor element with
internal isolating liquid is used.
4
1
3
2
Fig. 4: Conguration of the measuring system with piezoresistive sensor ele-
ment
1 Diaphragm
2 Isolating liquid
3 Base element
4 Sensor element
Strain gauge (DMS) sensor element
For measuring ranges above 100 bar, a strain gauge (DMS) sensor
element (dry system) is used.
Measuring system pres-
sure

10
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
3
2
1
Fig. 5: Conguration of the measuring system with strain gauge (DMS) sensor
element
1 Pressure cylinder
2 Process diaphragm
3 Sensor element
A temperature sensor on the respective sensor element for pressure
records the current process temperature.The temperature value is
output via:
• The display and adjustment module
• The current output or the additional current output
• The digital signal output
Ceramic/metallic measuring cell
Withsmallmeasuringrangesorhighertemperatures,theceramic/
metallic METEC®measuring cell is the measuring unit. It consists
of the ceramic-capacitive CERTEC®measuring cell and a special,
temperature-compensated chemical seal system.
4
3
2
1
Fig. 6: Conguration of the METEC®measuring cell
1 Process diaphragm
2 Isolating liquid
3 FeNi adapter
4 CERTEC®measuring cell
Measuring system tem-
perature

11
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
Temperature sensors in the ceramic diaphragm and the ceramic base
of the CERTEC®measuring cell detect the actual process tempera-
ture.The temperature value is output via:
• The display and adjustment module
• The current output or the additional current output
• The digital signal output
The measuring cell design depends on the selected pressure type.
Relative pressure: the measuring cell is open to the atmosphere.
The ambient pressure is detected in the measuring cell and compen-
sated.Itthushasnoinuenceonthemeasuredvalue.
Absolute pressure: the measuring cell contains vacuum and is
encapsulated. The ambient pressure is not compensated and does
henceinuencethemeasuredvalue.
Relative pressure, climate-compensated: the measuring cell is
evacuated and encapsulated. The ambient pressure is detected
through a reference sensor in the electronics and compensated. It
thushasnoinuenceonthemeasuredvalue.
The measuring system is completely welded and thus sealed against
the process.
Theprocessttingissealedagainsttheprocessbyasuitableseal.It
mustbeprovidedbythecustomer,dependingontheprocesstting
also included in the scope of delivery, see chapter " Technical data", "
Materials and weights".
3.3 Supplementary cleaning procedures
The VEGABAR 83 is also available in the version " Oil, grease and
silicone-free".These instruments have passed through a special
cleaning procedure to remove oil, grease and paint-wetting impair-
ment substances (PWIS).
The cleaning is carried out on all wetted parts as well as on surfaces
accessible from outside.To keep the purity level, the instruments are
immediately packed in plastic foil after the cleaning process. The
purity level remains as long as the instrument is kept in the closed
original packaging.
Caution:
The VEGABAR 83 in this version may not be used in oxygen ap-
plications. For this purpose, instruments are available in the special
version " Oil, grease and silicone-free for oxygen applications".
3.4 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging consists of environment-friendly, recyclable card-
board. For special versions, PE foam or PE foil is also used. Dispose
of the packaging material via specialised recycling companies.
Measuring system tem-
perature
Pressure types
Seal concept
Packaging

12
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
Transport must be carried out in due consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
• Not in the open
• Dry and dust free
• Not exposed to corrosive media
• Protected against solar radiation
• Avoiding mechanical shock and vibration
• Storage and transport temperature see chapter " Supplement -
Technical data - Ambient conditions"
• Relative moisture 20 … 85 %
With instrument weights of more than 18 kg (39.68 lbs) suitable and
approved equipment must be used for lifting and carrying.
3.5 Accessories
The instructions for the listed accessories can be found in the down-
load area on our homepage.
The display and adjustment module is used for measured value indi-
cation, adjustment and diagnosis.
The integrated Bluetooth module (optional) enables wireless adjust-
ment via standard adjustment devices.
The interface adapter VEGACONNECT enables the connection of
communication-capable instruments to the USB interface of a PC.
Secondary sensors of VEGABAR series 80 enable in conjunction with
VEGABAR83anelectronicdierentialpressuremeasurement.
The VEGADIS 81 is an external display and adjustment unit for VEGA
plics®sensors.
The VEGADIS adapter is an accessory part for sensors with double
chamber housings. It enables the connection of VEGADIS 81 to the
sensor housing via an M12 x 1 plug.
The protective cover protects the sensor housing against soiling and
intense heat from solar radiation.
Transport
Transport inspection
Storage
Storage and transport
temperature
Lifting and carrying
Display and adjustment
module
VEGACONNECT
Secondary sensors
VEGADIS 81
VEGADIS adapter
Protective cover

13
3 Product description
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
Screwedangesareavailableindierentversionsaccordingtothe
following standards: DIN 2501, EN 1092-1, BS 10, ASME B 16.5,
JIS B 2210-1984, GOST 12821-80.
Welded sockets are used to connect the devices to the process.
Threaded and hygienic adapters enable simple adaptation of devices
withstandardthreadedttingstoprocess-sidehygieneconnections.
Flanges
Welded socket, threaded
and hygienic adapter

14
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
4 Mounting
4.1 General instructions
Note:
For safety reasons, the instrument must only be operated within the
permissibleprocessconditions.Youcannddetailedinformationon
the process conditions in chapter " Technical data" of the operating
instructions or on the type label.
Hence make sure before mounting that all parts of the instrument ex-
posed to the process are suitable for the existing process conditions.
These are mainly:
• Active measuring component
• Processtting
• Process seal
Process conditions in particular are:
• Process pressure
• Process temperature
• Chemical properties of the medium
• Abrasionandmechanicalinuences
Protect your instrument against moisture ingress through the following
measures:
• Use a suitable connection cable (see chapter " Connecting to
power supply")
• Tighten the cable gland or plug connector
• Lead the connection cable downward in front of the cable entry or
plug connector
This applies mainly to outdoor installations, in areas where high
humidity is expected (e.g. through cleaning processes) and on cooled
or heated vessels.
Note:
Make sure that during installation or maintenance no moisture or dirt
can get inside the instrument.
To maintain the housing protection, make sure that the housing lid is
closed during operation and locked, if necessary.
Deviceswiththreadedttingarescrewedintotheprocessttingwith
a suitable wrench via the hexagon.
See chapter " Dimensions" for wrench size.
Warning:
The housing or the electrical connection may not be used for screw-
ing in! Depending on the device version, tightening can cause dam-
age, e. g. to the rotation mechanism of the housing.
Avoid damages on the device by lateral forces, for example by vibra-
tions.Itisthusrecommendedtoxthedeviceswithprocesstting
Process conditions
Protection against mois-
ture
Screwing in
Vibrations

15
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
thread G½ of plastic at the installation site via a suitable measuring
instrument holder.
If there is strong vibration at the mounting location, the instrument
version with external housing should be used. See chapter " External
housing".
Thepermissibleprocesspressurerangeisspeciedby"MWP"(Maxi-
mum Working Pressure) on the type label, see chapter " Structure".
The MWP takes the element of the measuring cell and processing
ttingcombinationwiththeweakestpressureintoconsiderationand
mayappliedpermanently.Thespecicationreferstoareference
temperature of +20 °C (+68 °F). It also applies when a measuring cell
with a higher measuring range than the permissible pressure range of
theprocessttingisinstalledorder-related.
In order to prevent damage to the device, a test pressure may only
exceedthespeciedMWPbrieyby1.5timesatreferencetempera-
ture.Thepressurestageoftheprocessttingaswellastheoverload
resistance of the measuring cell are taken into consideration here
(see chapter " Technical Data").
Inaddition,atemperaturederatingoftheprocesstting,e.g.with
anges,canlimitthepermissibleprocesspressurerangeaccording
to the respective standard.
The permissible process pressure range is stated on the type label.
The instrument should only be operated with these pressures if the
mountingaccessoryusedalsofullsthesevalues.Thisshouldbeen-
suredbysuitableanges,weldedsockets,tensionringswithClamp
connections, sealings, etc.
Higher process temperatures often mean also higher ambient
temperatures. Make sure that the upper temperature limits stated in
chapter " Technical data" for the environment of the electronics hous-
ing and connection cable are not exceeded.
1
2
Fig. 7: Temperature ranges
1 Process temperature
2 Ambient temperature
4.2 Instructions for oxygen applications
Oxygen and other gases can be explosive when brought into contact
with oils, grease and plastics, so the following measures must also be
taken:
Permissible process
pressure (MWP) - Device
Permissible process
pressure (MWP) - Mount-
ing accessory
Temperature limits
Oxygen applications

16
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
• All components of the system, e.g. measuring instruments, must
be cleaned in accordance with the requirements of recognized
regulations or standards
• Depending on the seal material, certain temperatures and pres-
sures must not be exceeded in oxygen applications, see chapter "
Technical data"
Danger:
Instruments for oxygen applications must be unpacked just before
mounting.Afterremovingtheprotectivecoveroftheprocesstting,
the label "O2"willbevisibleontheprocesstting.Penetrationofoil,
grease and dirt should be avoided. Danger of explosion!
4.3 Ventilation and pressure compensation
Thelterelementintheelectronicshousinghasthefollowingfunc-
tions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
Caution:
Thelterelementcausesatime-delayedpressurecompensation.
Whenquicklyopening/closingthehousingcover,themeasuredvalue
can change for approx. 5 s by up to 15 mbar.
Foraneectiveventilation,thelterelementmustbealwaysfreefrom
buildup. In case of horizontal mounting, turn the housing so that the
lterelementpointsdownwardaftertheinstrumentisinstalled.This
provides better protection against buildup.
Caution:
Donotuseahigh-pressurecleaner.Thelterelementcouldbedam-
aged, which would allow moisture into the housing.
Thefollowingparagraphsdescribehowthelterelementisarranged
inthedierentinstrumentversions.
3
3
2
1
Fig. 8: Position of the lter element
1 Plastic double chamber housing
2 Aluminium, stainless steel (precision casting) double chamber
3 Filter element
Filter element - Function
Filter element - Position

17
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
4.4 Process pressure measurement
Keep the following in mind when setting up the measuring system:
• Mount the instrument above the measuring point
Possiblecondensationcanthendrainointotheprocessline.
1
2
3
Fig. 9: Measurement setup for process pressure measurement of gases in
pipelines
1 VEGABAR 83
2 Blocking valve
3 Pipeline
Keep the following in mind when setting up the measuring system:
• Connect via a siphon
• Do not insulate the siphon
• Fill the siphon with water before setup
Measurement setup in
gases
Measurement setup in
vapours

18
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
1
4
3
2
1
2
3
4
Fig. 10: Measurement setup for the process pressure measurement of gases in
pipelines
1 VEGABAR 83
2 Blocking valve
3 Siphon in U or circular form
4 Pipeline
A protective accumulation of water is formed through condensation
in the pipe bends. Even in applications with hot steam, a medium
temperature < 100 °C on the transmitter is ensured.
Keep the following in mind when setting up the measuring system:
• Mount the instrument below the measuring point
Theeectivepressurelineisalwayslledwithliquidandgasbubbles
can bubble up to the process line.
3
1
2
Fig. 11: Measurement setup for the process pressure measurement of liquids in
pipelines
1 VEGABAR 83
2 Blocking valve
3 Pipeline
Measurement setup in
liquids

19
4 Mounting
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
4.5 Level measurement
Keep the following in mind when setting up the measuring system:
• Mount the instrument below the min. level
• Donotmounttheinstrumentclosetothellingstreamoremptying
area
• Mount the instrument so that it is protected against pressure
shocks from the stirrer
Fig. 12: Measurement setup for the level measurement
4.6 External housing
1
2
3
4
5
Fig. 13: Conguration, process module, external housing
1 Pipeline
2 Process module
3 Connection cable process assembly - External housing
4 External housing
5 Signal cable
Measurement setup
Conguration

20
5 Connecting to power supply and bus system
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-220624
5 Connecting to power supply and bus
system
5.1 Preparing the connection
Always keep in mind the following safety instructions:
• Carryoutelectricalconnectionbytrained,qualiedpersonnel
authorised by the plant operator
• If overvoltage surges are expected, overvoltage arresters should
be installed
Warning:
Only connect or disconnect in de-energized state.
The operating voltage and the digital bus signal are routed via sepa-
rate two-wire connection cables.
Thedataforpowersupplyarespeciedinchapter"Technical data".
Note:
Power the instrument via an energy-limited circuit (power max. 100 W)
acc. to IEC 61010-1, e.g.
• Class 2 power supply unit (acc. to UL1310)
• SELV power supply unit (safety extra-low voltage) with suitable
internal or external limitation of the output current
The instrument is connected with standard two-wire, twisted cable
suitable for RS 485. If electromagnetic interference is expected which
is above the test values of EN 61326 for industrial areas, shielded
cable should be used.
Use cable with round cross section for instruments with housing and
cable gland. Use a cable gland suitable for the cable diameter to
ensurethesealeectofthecablegland(IPprotectionrating).
Make sure that the entire installation is carried out according to the
Fieldbusspecication.Inparticular,makesurethatthebusistermi-
nated with suitable terminating resistors.
Make sure that the cable screen and grounding are carried out ac-
cordingtoFieldbusspecication.Werecommendtoconnectthe
cable screening to ground potential on both ends.
In systems with potential equalisation, connect the cable screening
directly to ground potential at the power supply unit and the sensor.
The cable screening in the sensor must be connected directly to the
internal ground terminal.The ground terminal outside on the housing
must be connected to the potential equalisation (low impedance).
Metric threads:
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory. They are sealed with plastic
plugs as transport protection.
Safety instructions
Voltage supply
Connection cable
Cable screening and
grounding
Cable glands