Vega VEGABAR 81 User manual

Operating Instructions
Pressure transmitter with chemical seal
VEGABAR 81
Probus PA
Document ID: 45020

2
Contents
VEGABAR 81 • Probus PA
45020-EN-170522
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 EU conformity................................................................................................................... 6
2.6 Permissible process pressure .......................................................................................... 6
2.7 NAMUR recommendations .............................................................................................. 6
2.8 Installation and operation in the USA and Canada ........................................................... 6
2.9 Environmental instructions ............................................................................................... 6
3 Product description
3.1 Conguration.................................................................................................................... 8
3.2 Principle of operation........................................................................................................ 9
3.3 Supplementary cleaning procedures.............................................................................. 12
3.4 Packaging, transport and storage................................................................................... 13
3.5 Accessories and replacement parts ............................................................................... 13
4 Mounting
4.1 General instructions ....................................................................................................... 16
4.2 Ventilation and pressure compensation.......................................................................... 17
4.3 Process pressure measurement..................................................................................... 20
4.4 Level measurement........................................................................................................ 23
4.5 External housing ............................................................................................................ 24
5 Connecting to the bus system
5.1 Preparing the connection ............................................................................................... 25
5.2 Connecting..................................................................................................................... 26
5.3 Single chamber housing................................................................................................. 28
5.4 Double chamber housing ............................................................................................... 28
5.5 Ex-d double chamber housing........................................................................................ 29
5.6 Double chamber housing with VEGADIS-Adapter.......................................................... 30
5.7 Housing IP 66/IP 68 (1 bar) ............................................................................................ 31
5.8 External housing with version IP 68 (25 bar)................................................................... 32
5.9 Switch-on phase............................................................................................................. 33
6 Set up with the display and adjustment module
6.1 Insert display and adjustment module............................................................................ 35
6.2 Adjustment system......................................................................................................... 36
6.3 Measured value indication.............................................................................................. 38
6.4 Parameter adjustment - Quick setup .............................................................................. 38
6.5 Parameter adjustment - Extended adjustment................................................................ 39
6.6 Saving the parameterisation data................................................................................... 52
7 Setup with PACTware
7.1 Connect the PC.............................................................................................................. 53
7.2 Parameter adjustment .................................................................................................... 53

3
Contents
VEGABAR 81 • Probus PA
45020-EN-170522
7.3 Saving the parameterisation data................................................................................... 54
8 Set up with other systems
8.1 DD adjustment programs ............................................................................................... 55
9 Diagnosis, asset management and service
9.1 Maintenance .................................................................................................................. 56
9.2 Diagnosis memory ......................................................................................................... 56
9.3 Asset Management function........................................................................................... 57
9.4 Rectify faults................................................................................................................... 60
9.5 Exchanging the electronics module................................................................................ 60
9.6 Exchange process assembly with version IP 68 (25 bar)................................................ 60
9.7 Software update ............................................................................................................. 62
9.8 How to proceed if a repair is necessary.......................................................................... 62
10 Dismount
10.1 Dismounting steps.......................................................................................................... 63
10.2 Disposal ......................................................................................................................... 63
11 Supplement
11.1 Technical data ................................................................................................................ 64
11.2 Chemical seal with vacuum applications........................................................................ 74
11.3 Communication Probus PA........................................................................................... 79
11.4 Dimensions .................................................................................................................... 82
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 manual.
Editing status: 2017-05-17

4
1 About this document
VEGABAR 81 • Probus PA
45020-EN-170522
1 About this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important instruc-
tions 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 im-
mediate 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.
• 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
VEGABAR 81 • Probus PA
45020-EN-170522
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
The VEGABAR 81 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. Thus damage 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 where a malfunction of the instrument
can cause a danger, the operator has to convince himself on the cor-
rect function of the instrument by taking suitable measures.
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.

6
2 For your safety
VEGABAR 81 • Probus PA
45020-EN-170522
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 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.
2.6 Permissible process pressure
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" as well as on the
type label.
The permissible process pressure range is specied on the type label
with "Process pressure", see chapter "Conguration". This applies
even if a measuring cell with a measuring range (order-related) higher
than the permissible pressure range of the process tting is installed.
A temperature derating, e.g. with anges, can limit the permissible
process pressure range.
2.7 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.
2.8 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

7
2 For your safety
VEGABAR 81 • Probus PA
45020-EN-170522
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
VEGABAR 81 • Probus PA
45020-EN-170522
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
13
14
12
10
11
5
3
6
4
7
8
9
Fig. 1: Layout of the type label (example)
1 Instrument type
2 Product code
3 Field for approvals
4 Power supply and signal output, electronics
5 Protection rating
6 Measuring range
7 Permissible process pressure
8 Material, wetted parts
9 Order number
10 Serial number of the instrument
11 QR code
12 Symbol of the device protection class
13 ID number, instrument documentation
14 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", "Instrument search (serial number)". Enter
the serial number.
Alternatively, you can access the data via your smartphone:
• Download the smartphone app "VEGA Tools" 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
VEGABAR 81 • Probus PA
45020-EN-170522
This operating instructions manual applies to the following instrument
versions:
• Hardware from 1.0.0
• Software version from 1.2.0
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 scope of delivery encompasses:
• Pressure transmitter
• Documentation
– Quick setup guide VEGABAR 81
– Characteristics test certicate
– Instructions for optional instrument features
– Ex-specic "Safety instructions" (with Ex versions)
– If necessary, further certicates
• DVD "DTM Collection", included therein
– PACTwa re
– DTM Collection
– Instrument master les (GSD) for Probus PA
– FDT certicates
Note:
Optional instrument features are also described in this operating
instructions manual. The respective scope of delivery results from the
order specication.
3.2 Principle of operation
The VEGABAR 81 is suitable for the measurement of the following
process variables:
• Process pressure
• Level
Fig. 2: Process pressure measurement VEGABAR 81
Scope of this operating
instructions manual
Scope of delivery
Measured variables

10
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
Depending on the version, the VEGABAR 81 is also suitable for
electronic dierential pressure measurement. For this, the instrument
is combined with a slave sensor.
Fig. 3: Electronic dierential pressure measurement through Master/Slave
combination
You can nd detailed information in the operating instructions of the
respective slave sensor.
VEGABAR 81 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 chemical seal systems of VEGABAR 81, which are optimally
adapted to the process, also allow measurement of highly corrosive
and hot products.
The VEGABAR 81 is equipped with a chemical seal. It consists of a
stainless steel diaphragm and a transmission liquid.
A chemical seal has two tasks:
• Separation of the sensor element from the medium
• Transmission of the process pressure to the sensor element
Electronicdierential
pressure
Application area
Measured products
Chemical seal

11
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
1
2
3
4
Fig. 4: Conguration of a chemical seal
1 Sensor element
2 Sealed screw
3 Transmission liquid
4 Stainless steel diaphragm
The chemical seal is available in dierent versions, see chapter
"Dimensions".
The process pressure acts on the sensor element via the isolating
diaphragm. The process pressure causes a resistance change which
is converted into a corresponding output signal and outputted as
measured value.
Measuring ranges up to 40 bar: piezoresistive sensor element with
a transmission liquid, measuring ranges from 100 bar: a dry strain
gauge (DMS) sensor element.
1
3 4
2
Fig. 5: Conguration of a measuring system with piezoresistive sensor element
1 Sensor element
2 Base element
3 Transmission liquid
4 Diaphragm
Measuring system

12
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
1
2
3
Fig. 6: Conguration of a measuring system with strain gauge (DMS) sensor
element
1 Sensor element
2 Process diaphragm
3 Pressure cylinder
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 is evacuated and encapsu-
lated. The ambient pressure is not compensated and does hence
inuence the measured value.
The measuring system is completely welded and hence sealed
against the process. The sealing of the process tting against the
process is carried out by a seal provided on site.
3.3 Supplementary cleaning procedures
The VEGABAR 81 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 81 in this version may not be used in oxygen ap-
plications. For this purpose, instruments are available in the special
version "Oil and grease-free for oxygen applications".
Pressure types
Seal concept

13
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
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.
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.
The integrated Bluetooth module (optional) enables wireless adjust-
ment via standard adjustment devices:1)
• 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 27835).
Packaging
T
ransport
Transport inspection
Storage
Storage and transport
temperature
Lifting and carrying
PLICSCOM
1) Bluetooth function with VEGADIS 82 can only be used at a later date.

14
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
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).
Slave sensors of VEGABAR series 80 enable in conjunction with
VEGABAR 81 an electronic dierential pressure measurement.
You can nd further information in the operating instructions of the
respective slave sensor.
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.
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).
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.
You can nd additional information in the supplementary instructions
manual "Flanges according to DIN-EN-ASME-JIS".
Welded sockets are used to connect the sensors to the process.
You can nd further information in the supplementary instructions
"Welded socket VEGABAR series 80" (Document-ID 48094).
The electronics module VEGABAR series 80 is a replacement part
for pressure transmitters of VEGABAR series 80. There is a dierent
version available for each type of signal output.
VEGACONNECT
Slave sensors
VEGADIS 81
VEGADIS adapter
Overvoltage protection
Protective cover
Flanges
Welded socket
Electronics module

15
3 Product description
VEGABAR 81 • Probus PA
45020-EN-170522
You can nd further information in the operating instructions "Elec-
tronics module VEGABAR series 80" (Document-ID 45054).
The supplementary electronics is a replacement part for sensors with
Probus PA and double chamber housing.
You can nd further information in the operating instructions "Supple-
mentary electronics for Probus PA" (Document-ID 42767).
Supplementary electron-
icsforProbusPA

16
4 Mounting
VEGABAR 81 • Probus PA
45020-EN-170522
4 Mounting
4.1 General instructions
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 DIN/EN/IEC/ANSI/ISA/UL/CSA 61010-1.
Protect your instrument against moisture ingress through the following
measures:
• Use the recommended cable (see chapter "Connecting to power
supply")
• Tighten the cable gland
• When mounting horizontally, turn the housing so that the cable
gland points downward
• Loop the connection cable downward in front of the cable gland
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.
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.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection. The dust protection caps do
not provide sucient protection against moisture.
Suitability for the process
conditions
Suitability for the ambient
conditions
Protection against mois-
ture
Cable glands

17
4 Mounting
VEGABAR 81 • Probus PA
45020-EN-170522
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
On instruments with threaded process tting, the hexagon must be
tightened with a suitable wrench. For the proper wrench size see
chapter "Dimensions".
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
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 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 Ventilation and pressure compensation
Ventilation and pressure compensation are carried out with
VEGABAR 81 via a lter element. It is air permeable and moisture-
blocking.
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 eective ventilation, the lter element must always be free of
buildup.
Screwing in
Vibrations
Process pressure range -
Mounting accessory
Temperature limits
Filter elements

18
4 Mounting
VEGABAR 81 • Probus PA
45020-EN-170522
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.
The lter element is mounted into the electronics housing. It has the
following functions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
→ 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.
1 2 3
6
6
6 6
6
5
4
Fig. 8: Position of the lter element - non-Ex, Ex-ia and Ex-d-ia version
1 Plastic, stainless steel single chamber (precision casting)
2 Aluminium - single chamber
3 Stainless steel single chamber (electropolished)
4 Plastic double chamber
5 Aluminium, stainless steel double chamber housing (precision casting)
6 Filter element
With the following instruments a blind plug is installed instead of the
lter element:
• Instruments in protection IP 66/IP 68 (1 bar) - ventilation via capil-
laries in non-detachable cable
• Instruments with absolute pressure
The lter element is integrated in the process assembly. It is located in
a rotatable metal ring and has the following function:
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
Instruments in non-Ex,
Ex-ia and Ex-d-ia version
Instruments in Ex-d ver-
sion

19
4 Mounting
VEGABAR 81 • Probus PA
45020-EN-170522
→ Turn the metal ring in such a way that the lter element points
downward after installation of the instrument. This provides better
protection against buildup.
21
3
4
3
4
Fig. 9: Position of the lter element - Ex-d version
1 Aluminium, stainless steel single chamber housing (precision casting)
2 Aluminium, stainless steel double chamber housing (precision casting)
3 Rotatable metal ring
4 Filter element
Instruments with absolute pressure have a blind plug mounted
instead of the lter element.
The Second Line of Defense (SLOD) is a second level of the process
separation in form of a gas-tight leadthrough in the housing neck,
preventing products from penetrating into the housing.
With these instruments, the process assembly is completely en-
capsulated. An absolute pressure measuring cell is used so that no
ventilation is required.
With relative pressure measuring ranges, the ambient pressure is
detected and compensated by a reference sensor in the electronics.
The lter element is mounted into the electronics housing. It has the
following functions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
→ Turn the housing so that the lter element points downward after
the instrument is installed. This provides better protection against
buildup.
Instruments with Second
Line of Defense

20
4 Mounting
VEGABAR 81 • Probus PA
45020-EN-170522
1
2
1
2
Fig. 10: Position of the lter element - gastight leadthrough
1 Filter element
2 Gas-tight leadthrough
The lter element is mounted into the electronics housing. It has the
following functions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
→ Turn the housing so that the lter element points downward after
the instrument is installed. This provides better protection against
buildup.
1
Fig. 11: Position of the lter element - IP 69K version
1 Filter element
Instruments with absolute pressure have a blind plug mounted
instead of the lter element.
4.3 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.
Instruments in IP 69K
version
Measurement setup in
gases