Vega VEGAPULS 61 User manual

Operating Instructions
Radar sensor for continuous level
measurement of liquids
VEGAPULS 61
Foundation Fieldbus
Approval according to LPR radio standard
Document ID: 41716

2
Contents
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
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................................................................................................................... 6
2.6 NAMUR recommendations .............................................................................................. 6
2.7 Radio license for Europe .................................................................................................. 6
2.8 Installation and operation in the USA and Canada ........................................................... 7
2.9 Environmental instructions ............................................................................................... 7
3 Product description ................................................................................................................. 8
3.1 Conguration.................................................................................................................... 8
3.2 Principle of operation........................................................................................................ 9
3.3 Packaging, transport and storage..................................................................................... 9
3.4 Accessories and replacement parts ............................................................................... 10
4 Mounting................................................................................................................................. 12
4.1 General instructions ....................................................................................................... 12
4.2 Collaroradapterange.................................................................................................. 13
4.3 Mounting preparations, mounting strap.......................................................................... 13
4.4 Mounting instructions ..................................................................................................... 14
4.5 Measurement setup - Pipes ........................................................................................... 19
4.6 Measurement setup - Flow............................................................................................. 24
5 Connecting to the bus system.............................................................................................. 26
5.1 Preparing the connection ............................................................................................... 26
5.2 Connecting..................................................................................................................... 27
5.3 Wiring plan, single chamber housing.............................................................................. 28
5.4 Wiring plan, double chamber housing ............................................................................ 29
5.5 Wiring plan, Ex-d-ia double chamber housing................................................................ 30
5.6 Double chamber housing with VEGADIS-Adapter.......................................................... 31
5.7 Wiring plan - version IP 66/IP 68, 1 bar........................................................................... 32
5.8 Switch-on phase............................................................................................................. 32
6 Set up with the display and adjustment module ................................................................ 33
6.1 Insert display and adjustment module............................................................................ 33
6.2 Adjustment system......................................................................................................... 34
6.3 Measured value indication - Selection of national language........................................... 35
6.4 Parameter adjustment .................................................................................................... 36
6.5 Saving the parameterisation data................................................................................... 53
7 Setup with PACTware............................................................................................................. 54
7.1 Connect the PC.............................................................................................................. 54
7.2 Parameter adjustment .................................................................................................... 54
7.3 Saving the parameterisation data................................................................................... 55

3
Contents
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
8 Set up with other systems .................................................................................................... 56
8.1 DD adjustment programs ............................................................................................... 56
8.2 Field Communicator 375, 475 ........................................................................................ 56
9 Diagnosis, asset management and service ........................................................................ 57
9.1 Maintenance .................................................................................................................. 57
9.2 Measured value and event memory ............................................................................... 57
9.3 Asset Management function........................................................................................... 58
9.4 Rectify faults................................................................................................................... 61
9.5 Exchanging the electronics module................................................................................ 65
9.6 Software update ............................................................................................................. 65
9.7 How to proceed if a repair is necessary.......................................................................... 66
10 Dismount................................................................................................................................. 67
10.1 Dismounting steps.......................................................................................................... 67
10.2 Disposal ......................................................................................................................... 67
11 Supplement ............................................................................................................................ 68
11.1 Technical data ................................................................................................................ 68
11.2 Supplementary information Foundation Fieldbus ........................................................... 75
11.3 Radio astronomy stations............................................................................................... 82
11.4 Dimensions .................................................................................................................... 83
11.5 Industrial property rights................................................................................................. 92
11.6 Trademark ...................................................................................................................... 92
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: 2018-12-19

4
1 About this document
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
1 About this document
1.1 Function
This operating instructions provides all the information you need for
mounting, connection and setup as well as important instructions for
maintenance,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, tip, note
This symbol indicates helpful additional information.
Caution: If this warning is ignored, faults or malfunctions can result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.
Ex applications
This symbol indicates special instructions for Ex applications.
• List
The dot set in front indicates a list with no implied sequence.
→ Action
This arrow indicates a single action.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Battery disposal
This symbol indicates special information about the disposal of bat-
teries and accumulators.

5
2 For your safety
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
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
VEGAPULS 61 is a sensor for continuous 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.
During the entire duration of use, the user is obliged to determine the
compliance of the necessary occupational safety measures with the
current valid rules and regulations and also take note of new regula-
tions.
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 and their meaning read in this oper-
ating instructions manual.

6
2 For your safety
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Depending on the instrument version, the emitting frequencies are in
the C, K or W band range.The low emission power is far below the
internationally approved limit values.When used correctly, the device
poses no danger to health.
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.
YoucanndtheEUconformitydeclarationonourwebsiteunder
www.vega.com/downloads.
Electromagnetic compatibility
Instruments in four-wire or Ex-d-ia version are designed for use in an
industrial environment. Nevertheless, electromagnetic interference
from electrical conductors and radiated emissions must be taken into
account, as is usual with class A instruments according to EN 61326-
1.Iftheinstrumentisusedinadierentenvironment,theelectromag-
netic compatibility to other instruments must be ensured by suitable
measures.
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
• 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 Radio license for Europe
The instrument was tested according to the latest issue of the follow-
ingharmonizedstandards:
• EN 302372 - Tank Level Probing Radar
• EN 302729 - Level Probing Radar
It is hence approved for use inside and outside closed vessels in
countries of the EU.
Use is also approved in EFTA countries, provided the respective
standards have been implemented.
For operation inside of closed vessels, points a to f in annex E of
EN302372mustbefullled.
For operation outside of closed vessels, the following conditions must
befullled:
• Theinstallationmustbecarriedoutbytrainedqualiedpersonnel

7
2 For your safety
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
• The instrument must be stationary mounted and the antenna
directed vertically downward
• The mounting location must be at least 4 km away from radio
astronomy stations, unless special permission was granted by the
responsible national approval authority
• When installed within 4 to 40 km of a radio astronomy station,
the instrument must not be mounted higher than 15 m above the
ground.
Youcanndalistoftherespectiveradioastronomystationsinchap-
ter "Supplement".
2.8 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.
2.9 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"

8
3 Product description
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
3 Product description
3.1 Conguration
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
2
1
15
13
14
12
11
5
3
6
4
7
8
10
9
Fig. 1: Layout of the type label (example)
1 Instrument type
2 Product code
3 Approvals
4 Power supply and signal output, electronics
5 Protection rating
6 Measuring range
7 Process and ambient temperature, process pressure
8 Material wetted parts
9 Hardware and software version
10 Order number
11 Serial number of the instrument
12 Data matrix code for VEGA Tools app
13 Symbol of the device protection class
14 ID numbers, instrument documentation
15 Reminder to observe the instrument documentation
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)
• Order-specicsensordataforanelectronicsexchange(XML)
• Testcerticate(PDF)-optional
Go to "www.vega.com", "Search". Enter the serial number.
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 Data Matrix code on the type label of the instrument or
• Enter the serial number manually in the app
Type label
Serial number - Instru-
ment search

9
3 Product description
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
This operating instructions manual applies to the following instrument
versions:
• Hardware from 2.1.1
• Software from 4.5.2
The scope of delivery encompasses:
• Radar sensor
• Mountingstrapwithxingmaterial(optional)
• Documentation
– Quick setup guide VEGAPULS 61
– Instructions for optional instrument features
– Ex-specic"Safety instructions" (with Ex versions)
– Ifnecessary,furthercerticates
Information:
The optional instrument features are described in the operating
instructions manual.The respective scope of delivery results from the
orderspecication.
3.2 Principle of operation
The VEGAPULS 61 is a radar sensor for continuous level measure-
ment of liquids under simple process conditions.
The instrument is ideal also for all applications in the water and waste
water industry. It is particularly suitable for level measurement in water
treatment,inpumpstationsaswellasstormwateroverowtanks,for
owmeasurementinopenumesandforgaugemeasurement.
Approval according to LPR radio standard means:
• Use outside closed vessels acc. to section "Radio license for
Europe"
• Type label without FCC/IC ID
• Electronics acc. to EN 30279 (LPR)
• Antenna version, plastic horn antenna
The antenna of the radar sensor emits short radar pulses with a
durationofapprox.1ns.Thesepulsesarereectedbytheproduct
and received by the antenna as echoes. The transit time of the radar
pulses from emission to reception is proportional to the distance and
hence to the level.The determined level is converted into an appropri-
ate output signal and outputted as measured value.
3.3 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 of standard instruments consists of environment-
friendly, recyclable cardboard. For special versions, PE foam or PE
foil is also used. Dispose of the packaging material via specialised
recycling companies.
Scope of this operating
instructions
Scope of delivery
Application area
LPR radio standard
Functional principle
Packaging

10
3 Product description
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
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 humidity 20 … 85 %
With instrument weights of more than 18 kg (39.68 lbs) suitable and
approved equipment must be used for lifting and carrying.
3.4 Accessories and replacement parts
The display and adjustment module PLICSCOM is used for measured
value indication, adjustment and diagnosis. It can be inserted into the
sensor or the external display and adjustment unit and removed at
any time.
The integrated Bluetooth module (optional) enables wireless adjust-
ment via standard adjustment devices:
• Smartphone/tablet (iOS or Android operating system)
• PC/notebook with Bluetooth USB adapter (Windows operating
system)
Youcanndfurtherinformationintheoperatinginstructions"Display
and adjustment module PLICSCOM" (Document-ID 36433).
The interface adapter VEGACONNECT enables the connection of
communication-capable instruments to the USB interface of a PC. For
parameter adjustment of these instruments, the adjustment software
PACTware with VEGA-DTM is required.
Youcanndfurtherinformationintheoperatinginstructions"Interface
adapter VEGACONNECT" (Document-ID 32628).
The VEGADIS 81 is an external display and adjustment unit for VEGA
plics®sensors.
For sensors with double chamber housing the interface adapter
"VEGADIS adapter" is also required for VEGADIS 81.
Transport
Transport inspection
Storage
Storage and transport
temperature
Lifting and carrying
PLICSCOM
VEGACONNECT
VEGADIS 81

11
3 Product description
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Youcanndfurtherinformationintheoperatinginstructions
"VEGADIS 81" (Document-ID 43814).
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.
Youcanndfurtherinformationinthesupplementaryinstructions
"VEGADIS adapter" (Document-ID 45250).
The overvoltage arrester B81-35 is used in the single or double
chamber housing instead of the connection terminals. It reduces any
voltage surges that may reach the signal cables to a harmless level.
Youcanndfurtherinformationinthesupplementaryinstructions
"Overvoltage arrester B81-35" (Document-ID 50708).
The protective cover protects the sensor housing against soiling and
intense heat from solar radiation.
Youwillndadditionalinformationinthesupplementaryinstructions
manual "Protective cover" (Document-ID 34296).
Electronics module "VEGAPULS series 60" is a replacement part for
radarsensorsofVEGAPULSseries60.Adierentversionisavailable
for each type of signal output.
Youcanndfurtherinformationintheoperatinginstructions"Elec-
tronics module VEGAPULS series 60" (Document-ID 36801).
The supplementary electronics is a replacement part for sensors with
Foundation Fieldbus and double chamber housing.
Youcanndfurtherinformationintheoperatinginstructions"Supple-
mentary electronics for Foundation Fieldbus" (Document-ID 45111).
VEGADIS adapter
Overvoltage protection
Protective cover
Electronics module
Supplementary elec-
tronics for Foundation
Fieldbus

12
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
4 Mounting
4.1 General instructions
Ondeviceswithathreadedtting,thehexagonontheprocesstting
must be tightened with a suitable wrench.
See chapter "Dimensions"forwrenchsize.
Warning:
The housing or the electrical connection may not be used for screw-
ing in! Tightening can cause damage, e. g. to the rotation mechanism
of the housing.
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
• Whenmountinghorizontally,turnthehousingsothatthecable
gland or plug connector point downward
• 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.
To maintain the housing protection, make sure that the housing lid is
closed during operation and locked, if necessary.
Makesurethatthedegreeofcontaminationspeciedinchapter
"Technical data" meets the existing ambient conditions.
Make sure before mounting that all parts of the instrument exposed 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
Youcannddetailedinformationontheprocessconditionsinchapter
"Technical data" as well as on the type label.
The instrument is suitable for standard and extended ambient condi-
tions acc. to IEC/EN 61010-1.
Screwing in
Protection against mois-
ture
Suitability for the process
conditions
Suitability for the ambient
conditions

13
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
4.2 Collaroradapterange
Formountingtheinstrumentonasocket,acombicompressionange
forDN80(ASME3"orJIS80)isalsoavailableforretrotting.Option-
ally,theinstrumentcanbealsoequippedwithanadapterangefrom
DN 100 (ASME 4" or JIS 100).
With the housing versions plastic, aluminium single chamber and
stainlesssteel,thecollarangecanbeplaceddirectlyoverthehous-
ing. With the aluminium double chamber housing, retroactive mount-
inginthiswayisnotpossible-themountingtypemustbespecied
with the order.
Youcannddrawingsofthesemountingoptionsinchapter"Dimen-
sions".
Fig. 2: Flange mounting of the radar sensor
4.3 Mounting preparations, mounting strap
The mounting strap enables simple mounting on the vessel wall or
silo top. It is suitable for wall, ceiling or boom mounting. Especially in
openvesselsthisisaveryeasyandeectivewaytoalignthesensor
to the bulk solid surface.
The strap is supplied unassembled and must be screwed to the
sensor before setup with three hexagon socket screws M5 x 10 and
spring washers. Max. torque, see chapter "Technical data". Required
tools:Allenwrenchsize4.
There are two ways to screw the strap onto the sensor. Depending
on the selected version, the sensors can be swivelled in the strap as
follows:
• Single chamber housing
– Angleofinclination180°,innitelyvariable
– Angle of inclination in three steps 0°, 90° and 180°

14
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
• Double chamber housing
– Angleofinclination90°,innitelyvariable
– Angle of inclination in two steps 0° and 90°
Fig. 3: Adjustment of the angle of inclination
Fig. 4: Turning by fastening in the centre
4.4 Mounting instructions
For tight installation of the version with plastic horn antenna with com-
pressionoradapterange,thefollowingconditionsmustbefullled:
1. Usesuitableatseal,e.g.ofEPDMwithShorehardness25or50
2. Makesurethenumberofangescrewscorrespondstothenum-
berofangeholes
3. Tighten all screws with the torque stated in the technical data
The emitted radar impulses of the radar sensor are electromagnetic
waves.The polarisation is the direction of the electrical share.With
radarsensors,thepolarisationcanbeusedtoreducetheeectof
false echoes considerably by turning the instrument in the connection
angeormountingboss.
The position of the polarisation is marked on the instrument.
Tight installation of the
plastic horn antenna
Polarisation

15
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
1
Fig. 5: Position of the polarisation
1 Marking bar
When mounting the sensor, keep a distance of at least 200 mm
(7.874 in) to the vessel wall. If the sensor is installed in the center of
dished or round vessel tops, multiple echoes can arise. These can,
however, be suppressed by an appropriate adjustment (see chapter
"Setup").
If you cannot maintain this distance, you should carry out a false
signal suppression during setup.This applies particularly if buildup on
the vessel wall is expected. In such cases, we recommend repeating
the false signal suppression at a later date with existing buildup.
> 200 mm
(7.87
")
Fig. 6: Mounting of the radar sensor on round vessel tops
In vessels with conical bottom it can be advantageous to mount the
sensor in the centre of the vessel, as measurement is then possible
down to the bottom.
Installation position

16
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Fig. 7: Mounting of the radar sensor on vessels with conical bottom
Donotmounttheinstrumentsinorabovethellingstream.Makesure
thatyoudetecttheproductsurface,nottheinowingproduct.
Fig. 8: Mounting of the radar sensor with inowing medium
AcorrespondingcollarangeforDN80(ASME3"orJIS80)aswell
asasuitableadapterangeareavailableformountingVEGAPULS
61.
With the housing versions plastic, aluminium single chamber and
stainlesssteel,thecollarangecanbeplaceddirectlyoverthehous-
ing. With the aluminium double chamber housing, retroactive mount-
inginthiswayisnotpossible-themountingtypemustbespecied
with the order.
Inowingmedium
Socket with plastic horn
antenna

17
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Information:
The mounting socket should be as short as possible and its end
rounded.This reduces false echoes from the vessel mounting socket.
Fig. 9: Recommended socket mounting
Ifthemediumhasgoodreectiveproperties,VEGAPULS61can
also be mounted on a longer socket piece. Recommended values
forsocketheightsarespeciedinthefollowingillustration.Youmust
carry out a false echo storage afterwards.
d
h
The below charts specify the max. socket length h depending on the
diameter d.
Socket diameter d Socket length h
80 mm 3" ≤300mm ≤11.8in
100 mm 4" ≤400mm ≤15.8in
150 mm 6" ≤500mm ≤19.7in
Socket diameter d Socket length h
3" ≤11.8in
4" ≤15.8in
6" ≤19.7in
In liquids, direct the sensor as perpendicular as possible to the prod-
uct surface to achieve optimum measurement results.
Sensor orientation

18
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Fig. 11: Alignment in liquids
The mounting location of the radar sensor should be a place where no
otherequipmentorxturescrossthepathoftheradarsignals.
Vessel installations, such as e.g. ladders, limit switches, heating spi-
rals, struts, etc., can cause false echoes and impair the useful echo.
Make sure when planning your measuring point that the radar sensor
has a "clear view" to the measured product.
In case of existing vessel installations, a false signal suppression
should be carried out during setup.
If large vessel installations such as struts or supports cause false
echoes, these can be attenuated through supplementary measures.
Small,inclinedsheetmetalbaesabovetheinstallationsscatterthe
radarsignalsandpreventdirectinterferingreections.
Fig. 12: Cover at, large-area proles with deectors
If there are agitators in the vessel, a false signal suppression should
be carried out with the agitators in motion.This ensures that the
interferingreectionsfromtheagitatorsaresavedwiththebladesin
dierentpositions.
Vessel installations
Agitators

19
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
Fig. 13: Agitators
Throughtheactionoflling,stirringandotherprocessesinthevessel,
compact foam can form on the product surface, damping the emitted
signals considerably.
If foams are causing measurement errors, the biggest possible radar
antennas, the electronics with increased sensitivity or low frequency
radar sensors (C band) should be used.
As an alternative, sensors with guided microwave can be used. These
areunaectedbyfoamgenerationandarebestsuitedforsuchap-
plications.
4.5 Measurement setup - Pipes
Byusingasurgepipeinthevessel,theinuenceofvesselinstalla-
tions and turbulence can be excluded. Under these prerequisites, the
measurementofproductswithlowdielectricvalues(εrvalue≤1.6)is
possible.
Note the following illustrations and instructions for measurement in a
surge pipe.
Information:
Measurement in a surge pipe is not recommended for extremely
adhesive products.
Foam generation
Measurement in a surge
pipe

20
4 Mounting
VEGAPULS 61 • Foundation Fieldbus
41716-EN-181220
15°
45°
1
2
3
100%
4
5
7
6
0%
8
9
10
Fig. 14: Conguration surge pipe VEGAPULS 61
1 Radar sensor
2 Polarisation marking
3 Thread or ange on the instrument
4 Vent hole
5 Holes
6 Welding connection through U-prole
7 Ball valve with complete opening
8 Surge pipe end
9 Reector sheet
10 Fastening of the surge pipe
Congurationsurgepipe