Vega VEGADIF 65 User manual

Operating Instructions
Differential pressure transmitter with
metallic measuring diaphragm
VEGADIF 65
4 … 20 mA
Document ID: 36236

2
Contents
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
Contents
1 About this document
1.1 Function ........................................................................................................................... 4
1.2 Target group ..................................................................................................................... 4
1.3 Symbols used................................................................................................................... 4
2 For your safety
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 Safety label on the instrument .......................................................................................... 6
2.6 EU conformity................................................................................................................... 6
2.7 FulllmentofNAMURrecommendations ......................................................................... 6
2.8 Installation and operation in the USA and Canada ........................................................... 6
2.9 Safety instructions for oxygen applications....................................................................... 6
2.10 Environmental instructions ............................................................................................... 7
3 Product description
3.1 Conguration.................................................................................................................... 8
3.2 Principle of operation........................................................................................................ 9
3.3 Adjustment..................................................................................................................... 12
3.4 Packaging, transport and storage................................................................................... 13
3.5 Accessories and replacement parts ............................................................................... 13
4 Mounting
4.1 General instructions for use of the instrument ................................................................ 16
4.2 Instructions for oxygen applications ............................................................................... 17
4.3 Mountingandconnectioninstructions............................................................................ 17
4.4 Measurementsetup-Flow............................................................................................. 21
4.5 Measurementsetuplevel ............................................................................................... 24
4.6 Measurementsetupdensityandinterface...................................................................... 28
4.7 Measurementsetupdierentialpressure ....................................................................... 30
4.8 Mountingexternalhousing ............................................................................................. 32
4.9 Installation control .......................................................................................................... 33
5 Connecting to power supply
5.1 Preparing the connection ............................................................................................... 34
5.2 Connection procedure.................................................................................................... 35
5.3 Single chamber housing................................................................................................. 36
5.4 Double chamber housing ............................................................................................... 37
5.5 Double chamber housing Ex d ia.................................................................................... 38
5.6 Version IP 66/IP 68, 1 bar............................................................................................... 39
5.7 External housing on IP 68 version .................................................................................. 40
5.8 Switch-onphase............................................................................................................. 41
6 Adjustment with the display and adjustment module PLICSCOM
6.1 Short description ............................................................................................................ 42
6.2 Insert display and adjustment module............................................................................ 42
6.3 Adjustment system......................................................................................................... 43
6.4 Set parameters............................................................................................................... 44
6.5 Menuschematic............................................................................................................. 53
6.12 Saving the parameterisation data................................................................................... 56

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Contents
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
7 Setup
7.1 General instructions ....................................................................................................... 57
7.2 Flowmeasurement......................................................................................................... 57
7.3 Level measurement........................................................................................................ 59
7.4 Density and interface measurement............................................................................... 61
7.5 Dierentialpressuremeasurement ................................................................................ 61
8 Maintenanceandfaultrectication
8.1 Maintenance .................................................................................................................. 62
8.2 Rectifyfaults................................................................................................................... 62
8.3 Exchanging the electronics module................................................................................ 63
8.4 Softwareupdate ............................................................................................................. 63
8.5 Howtoproceedifarepairisnecessary.......................................................................... 64
9 Dismount
9.1 Dismounting steps.......................................................................................................... 65
9.2 Disposal ......................................................................................................................... 65
10 Supplement
10.1 Technical data ................................................................................................................ 66
10.2 Dimensions, versions process component..................................................................... 77
10.3 Industrial property rights................................................................................................. 83
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manual.
Editing status: 2017-08-21

4
1 About this document
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
1 About this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup of the instrument. Further-
morethereareimportantinstructionsformaintenance,faultrectica-
tion, 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 specialist
personnel.The contents of this manual should be made available to
these personnel and put into practice by them.
1.3 Symbols used
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.
SIL applications
Thissymbolindicatesinstructionsforfunctionalsafetywhichmustbe
taken into account particularly for safety-relevant 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.

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2 For your safety
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
2 For your safety
2.1 Authorised personnel
All operations described in this operating instructions manual must
be carried out only by trained specialist 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
VEGADIF65isadierentialpressuretransmitterformeasurementof
ow,level,dierentialpressure,densityandinterface.
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.
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.
2.3 Warning about incorrect use
Inappropriate or incorrect use of the instrument can give rise to
application-specichazards,e.g.vesseloverllordamagetosystem
components through incorrect mounting or adjustment.Thus dam-
age to property, to persons or environmental contamination can be
caused. Also the protective characteristics of the instrument can be
inuenced.
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-

6
2 For your safety
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
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 looked up in this
operating instructions manual.
2.5 Safety label on the instrument
The safety approval markings and safety tips on the device must be
observed.
2.6 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.
2.7 Fulllmentof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 43 – Signal level for fault information from measuring transduc-
ers
• NE53–Compatibilityofelddevicesanddisplay/adjustment
components
For further information see www.namur.de.
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 Safety instructions for oxygen applications
For instruments in oxygen applications the special instructions in
chapters "Storage and transport", "Mounting"aswellas"Technical
data" under "Process conditions"must be noted. Furthermore the valid
national regulations, implementation instructions and memorandums
of the professional assocations must be noted.

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2 For your safety
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
2.10 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"

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3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
3 Product description
3.1 Conguration
The scope of delivery encompasses:
• VEGADIF65dierentialpressuretransmitter
• Dependingontheversion,ventilationvalvesand/orscrewplugs
(details see chapter "Dimensions")
• Optional accessory
• Documentation
– This operating instructions manual
– Operating instructions "Display and adjustment module"
(optional)
– Supplementary instructions manual "Heating for display and
adjustment module" (optional)
– Operating instructions "Chemical seal CSB" (optional)
– Operating instructions "Chemical seal CSS" (optional)
– Supplementary instructions manual "Plug connector for con-
tinuously measuring sensors" (optional)
– Ex-specic"Safety instructions"(withExversions)
– Certicate"For oxygen application"(withrespectiveversions)
– Ifnecessary,furthercerticates
ThefollowingillustrationshowsthecomponentsofVEGADIF65:
+ –
1
2
3
Fig. 1: VEGADIF 65 in basic version
1 Housing cover, optionally with integrated display and adjustment module
2 Housing with electronics
3 Process component with measuring cell
Thecomponentsareavailableindierentversions.
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
Scope of delivery
Constituent parts

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3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
2
1
12
11
5
3
6
4
7
8
9
10
Fig. 2: Layout of the type label (example)
1 Instrument type
2 Product code
3 Approvals
4 Electronics
5 Protection rating
6 Measuring range
7 Process temperature, process pressure
8 Material, wetted parts
9 Hardware and software version
10 Order number
11 Serial number of the instrument
12 ID numbers, instrument documentation
With the serial number, you can access the delivery data of the instru-
ment via "www.vega.com", "VEGA Tools" and "serial number search".
Youcanndtheserialnumberontheinsideoftheinstrumentaswell
as on the type label on the outside.
3.2 Principle of operation
VEGADIF65isadierentialpressuretransmitterformeasurement
ofow,level,dierentialpressure,densityandinterface.Measured
productsaregases,vapoursandliquids.
Application area

10
3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
Flow measurement
QQ
p1p1
p2p2
Q~ ∆p Q~ ∆p
++ ––
1 2
Fig. 3: Flow measurement with VEGADIF 65 and DP ow element, Q = ow, Δp
= dierential pressure, Δp = p1- p2
1 Orice
2 Pitot tube
Level measurement
123
h= ∆p
ρg
+
+
–
–
h
+ –
Fig. 4: Level measurement with VEGADIF 65. Δp = dierential pressure, ρ =
density of the medium, g = acceleration of gravity
1 Basic version with eective pressure lines
2 Version with ange chemical seal
3 Version with capillaries and cell chemical seals

11
3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
Dierentialpressuremeasurement
+

2
1
Fig. 5: Dierential pressure measurement with VEGADIF 65
1 Filter
2 VEGADIF 65
Density measurement
=∆p
hg
+
–
h
1
Fig. 6: Density measurement with VEGADIF 65, h = dened mounting distance,
Δp = dierential pressure, ρ = density of the medium, g = acceleration of gravity
1 VEGADIF 65
Interface measurement
1
+
–
h
2
3
Fig. 7: Interface measurement with VEGADIF 65
1 VEGADIF 65
2 Liquid with higher density
3 Liquid with lower density

12
3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
A metallic measuring cell is used as sensor element.The process
pressuresaretransmittedviatheseparatingdiaphragmsandlling
oilstoapiezoresistivemeasuringelement(resistancemeasuring
bridge in semi-conductor technology).
Thedierencebetweentheactingpressureschangesthebridgevolt-
age.This change is measured, further processed and converted into
a corresponding output signal.
1
p2 p
12
3
4
Fig. 8: Conguration metallic measuring cell
1 Measuring element
2 Overload diaphragm/Middle diaphragm
3 Filling oil
4 Separating diaphragms
p1, p2Process pressures
The markings "+" and "-" on the process component in chapter
"Mounting and connection instructions"mustthereforebenotedwhen
connecting to the process. The pressure acting on "+" goes positive,
the pressure acting on "-" goes negative into the calculation of the
pressuredierence.
4…20mAtwo-wireelectronicsforvoltagesupplyandmeasured
value transmission on the same cable.
Thesupplyvoltagerangecandierdependingontheinstrumentver-
sion.The exact range is stated in chapter "Technical data".
Thebacklightofthedisplayandadjustmentmoduleispoweredby
thesensor.Theprerequisiteforthisisasupplyvoltageatacertain
level.Theexactvoltagespecicationsarestatedinchapter"Technical
data".
Theoptionalheatingrequiresitsownoperatingvoltage.Youcannd
further details in the supplementary instructions manual "Heating for
display and adjustment module".
This function is generally not available for approved instruments.
3.3 Adjustment
Theinstrumentcanbeadjustedwiththefollowingadjustmentmedia:
• With the display and adjustment module
• withthesuitableVEGADTMinconjunctionwithanadjustment
softwareaccordingtotheFDT/DTMstandard,e.g.PACTwareand
PC
Functional principle
Voltage supply

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3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
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 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.
Caution:
Instruments for oxygen applications are sealed in PE foil and provided
withalabel"Oxygen!UsenoOil".Removethisfoiljustbeforemount-
ingtheinstrument!Seeinstructionunder"Mounting".
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aninstrumentweightofmorethan18kg(39.68lbs)suitableand
approvedequipmentmustbeusedforliftingandcarrying.
3.5 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 and removed at any time.
Youcanndfurtherinformationintheoperatinginstructions"Display
and adjustment module PLICSCOM" (Document-ID 27835).
The interface adapter VEGACONNECT enables the connection of
communication-capable instruments to the USB interface of a PC. For
parameteradjustmentoftheseinstruments,anadjustmentsoftware
suchasPACTwarewithVEGADTMisrequired.
Packaging
Transport
Transport inspection
Storage
Storage and transport
temperature
Lifting and carrying
PLICSCOM
VEGACONNECT

14
3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
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
"DISADAPT"isalsorequiredforVEGADIS81.
Youcanndfurtherinformationintheoperatinginstructions
"VEGADIS 81" (Document-ID 43814).
The VEGADIS 82 is suitable for measured value indication of
4 … 20 mA sensors. It is looped into the signal cable.
Youcanndfurtherinformationintheoperatinginstructions
"VEGADIS 82" (Document-ID 46591).
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).
Theovalangeadapterenablestheconnectionofa½NPTtubetoa
VEGADIF 65 or a valve block. By selecting the suitable materials, the
ovalangeadaptercanbeadaptedtoallprocesses.
Youcanndadditionalinformationinthesupplementaryinstructions
"Mounting accessories, pressure" (Document-ID 43478).
Valveblocksenablesimpleinstallationandsetupofadierential
pressuretransmitter.Whentheprocessvalvesareclosed,theequali-
zationvalveenablesapressurecompensationforthemeasuring
chambers.Thisallowsthezeropointofthepressuretransmittertobe
adjusted.
Youcanndadditionalinformationinthesupplementaryinstructions
"Mounting accessories, pressure" (Document-ID 43478).
ThemountingbracketisusedforwallortubemountingofVEGADIF
65.Itissuppliedwithstrapfortubemountingandfaxingscrews
7/16UNF,M10forVEGADIF65.Thematerialusedis316L.
Youcanndadditionalinformationinthesupplementaryinstructions
"Mounting accessories, pressure" (Document-ID 43478).
By connecting chemical seals CSS and CSB, the application range
canbeextended.Forexample,itisalsopossibletorealizeinterface
anddensitymeasurementswithconnectedchemicalsealsCSB.
Byinstallingchemicalseals,applicationswithcorrosive,highlyvis-
cousandhotproductscanbealsoberealized.
Youcanndadditionalinformationintheoperatinginstructions
"Chemical seal CSS or CSB" (Document-ID 36133 or 36134).
The electronics module is a replacement part for pressure transmitter
VEGABAR.Oneversionisavailableforeachtypeofsignaloutput.
VEGADIS 81
VEGADIS 82
Protective cover
Ovalangeadapter
Valve blocks
Mounting bracket
Chemical seal
Electronics module

15
3 Product description
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
Youndfurtherinformationintheoperatinginstructions"Electronics
module VEGABAR series 50 and 60 " (Document-ID 30175).

16
4Mounting
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
4 Mounting
4.1 General instructions for use of the instrument
Makesurethatallpartsoftheinstrumentcomingindirectcontact
withtheprocess,especiallythesensorelement,processsealand
processtting,aresuitablefortheexistingprocessconditions,such
asprocesspressure,processtemperatureaswellasthechemical
properties of the medium.
Youcanndthespecicationsorreferencesinchapters"Techni-
cal data", "Dimensions, versions process component" and on the
nameplate.
The instrument is suitable for standard and extended ambient condi-
tions acc. to DIN/EN/IEC/ANSI/ISA/UL/CSA 61010-1.
Use the recommended cables (see chapter "Connecting to power
supply") and tighten the cable gland.
You can give your instrument additional protection against moisture
penetrationbyleadingtheconnectioncabledownwardinfrontofthe
cableentry.Rainandcondensationwatercanthusdraino.Thisap-
pliesmainlytooutdoormountingaswellasinstallationinareaswhere
high humidity is expected (e.g. through cleaning processes) or 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.
Theventilationfortheelectronicshousingisrealisedviaalterele-
ment in the vicinity of the cable glands.
2
1
2
1
2
1
1
2
Fig. 9: Position of the lter element with single and double chamber housing
1 Filter element for ventilation of the electronics housing
2 Blind plug
Information:
Makesurethatthelterelementisalwaysfreeofbuildupduringop-
eration. A high-pressure cleaner may not be used for cleaning.
Suitability for the process
conditions
Suitability for the ambient
conditions
Moisture
Ventilation

17
4Mounting
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
DPowelementsarecalculatedforcertainpipelineandoperating
data.Therefore, check the pipeline data before installation at the
measuring point and compare the measurement loop number.
DetailedinstructionsformountingtheDPowelementarestatedin
DINENISO5167aswellasintheinstrumentdocumentationfromthe
respective manufacturer.
Whenwiringtheeectivepressurelinesoutdoors,makesurethat
youuseasuitableantifreeze,e.g.byusingaheattracing.Wirethe
eectivepressurelineswithamonotonousgradientofatleast10%.
Eectivepressurelinesforgasesmustremaindry,condensatemust
beavoided.Eectivepressurelinesforliquidsmustbecompletely
lledandventilated.
Generalrecommendationsforwiringofeectivepressurelinesare
stated in the corresponding national and international standards.
In case of strong vibrations at the application position, the instrument
versionwithexternalelectronicsshouldbeused.
Higher process temperatures often mean also higher ambient tem-
peraturesforelectronicsandconnectioncable.Makesurethatthe
upper temperature limits stated in chapter "Technical data" for the
environment of the electronics housing and connection cable are not
exceeded.
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:
• All components of the plant, such as e.g. measuring instru-
mentsmustbecleanedaccordingtotherequirementsofBAM
(DIN 19247)
• 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 Mounting and connection instructions
When connecting the VEGADIF 65 to the measurement loop, take
note of the plus/minus side of the process component.The plus side
ismarkedwitha"+",theminussidewitha"-" on the process compo-
nentnexttotheovalanges.
DPowelement
Eectivepressurelines
Vibrations
Temperature limits
Oxygen applications
Connection plus/minus
side

18
4Mounting
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
+ –
2
1
Fig. 10: Marking for plus/minus side on the process component
1 Plus side
2 Minus side
Thefollowingillustrationshowstheelementsforatubemountingand
anexampleforamountingarrangementwithvalveblock.
23 4
6
7
8
9
10
1
5
Fig. 11: Mounting arrangement with tube mounting
1 Strap for tube mounting
2 Mounting bracket
3 Ventilation valve
4 Fixing screws
5 VEGADIF 65
6 PTFE seal
7 Valve block
8 Oval ange adapter
9 Fixing screws
10 Eective pressure line
Valveblocksenablethesimpleinstallationandsetupofthedierential
pressure transmitter.They separate the pressure transmitter from the
process side and enable also a check of the measurement loop.They
Mounting arrangement
Valve blocks

19
4Mounting
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
areavailableas3-foldand5-foldversion.Theintegratedequalization
valveenablesapressurecompensationbetweenplusandminusside
during the setup.Thanks to the valve block it is possible to dismount
theVEGADIF65withoutinterruptingtheprocess.Thismeanshigher
plant availability and simpler setup or maintenance.
The3-foldvalveblockwithangingonbothsidesenablesamechani-
callystableconnectionbetweentheVEGADIF65ande.g.thetapping
pointsortheangeplateofapitottube.Withtheve-foldvalveblock,
twoadditionalvalvesallowblowingouttheprocesslinesorchecking
the VEGADIF 65 in installed condition.
Thefollowingillustrationshowstheconnectionofthe3-foldvalve
block.
A:
A
1 23 45
2 2
1
3 45
Fig. 12: Connection of a 3-fold valve block
1 Process tting
2 Process tting
3 Inlet valve
4 Inlet valve
5 Breather valve
3-fold valve block

20
4Mounting
VEGADIF 65 • 4 … 20 mA
36236-EN-170823
Thefollowingillustrationshowstheconnectionofthe3-foldvalve
block,angingonbothsides.
A:
A
1 23 45
2 2
13 45
Fig. 13: Connection of a 3-fold valve block, anging on both sides
1 Process tting
2 Process tting
3 Inlet valve
4 Inlet valve
5 Breather valve
Thefollowingillustrationshowstheconnectionofthe5-foldvalve
block.
3-foldvalveblock,ang-
ing on both sides
5-fold valve block