Vega VEGABAR 81 User manual

Operating Instructions
Pressure transmitter with chemical seal
VEGABAR 81
4 … 20 mA
Document ID: 45025

2
Contents
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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 CE conformity................................................................................................................... 5
2.6 Permissible process pressure .......................................................................................... 6
2.7 NAMUR recommendations .............................................................................................. 6
2.8 Environmental instructions ............................................................................................... 6
3 Product description
3.1 Conguration.................................................................................................................... 7
3.2 Principle of operation........................................................................................................ 8
3.3 Supplementary cleaning procedures.............................................................................. 10
3.4 Packaging, transport and storage................................................................................... 11
3.5 Accessories and replacement parts ............................................................................... 11
4 Mounting
4.1 General instructions ....................................................................................................... 13
4.2 Ventilation and pressure compensation.......................................................................... 14
4.3 Process pressure measurement..................................................................................... 16
4.4 Level measurement........................................................................................................ 18
4.5 External housing ............................................................................................................ 19
5 Connecting to power supply
5.1 Preparing the connection ............................................................................................... 20
5.2 Connecting..................................................................................................................... 21
5.3 Single chamber housing................................................................................................. 22
5.4 Housing IP 66/IP 68 (1 bar) ............................................................................................ 23
5.5 External housing with version IP 68 (25 bar)................................................................... 24
5.6 Overvoltage protection module ...................................................................................... 26
5.7 Switch-on phase............................................................................................................. 26
6 Set up with the display and adjustment module
6.1 Insert display and adjustment module............................................................................ 27
6.2 Adjustment system......................................................................................................... 28
6.3 Measured value indication.............................................................................................. 29
6.4 Parameter adjustment - Quick setup .............................................................................. 29
6.5 Parameter adjustment - Extended adjustment................................................................ 30
6.6 Saving the parameter adjustment data........................................................................... 43
7 Setup with PACTware
7.1 Connect the PC.............................................................................................................. 44
7.2 Parameter adjustment .................................................................................................... 44
7.3 Saving the parameter adjustment data........................................................................... 45
8 Set up with other systems

3
Contents
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
8.1 DD adjustment programs ............................................................................................... 46
8.2 Field Communicator 375, 475 ........................................................................................ 46
9 Diagnostics and servicing
9.1 Maintenance .................................................................................................................. 47
9.2 Rectify faults................................................................................................................... 47
9.3 Exchanging the electronics module................................................................................ 48
9.4 Exchange process assembly with version IP 68 (25 bar)................................................ 48
9.5 Software update ............................................................................................................. 49
9.6 How to proceed if a repair is necessary.......................................................................... 50
10 Dismount
10.1 Dismounting steps.......................................................................................................... 51
10.2 Disposal ......................................................................................................................... 51
11 Supplement
11.1 Technical data ................................................................................................................ 52
11.2 Chemical seal with vacuum applications........................................................................ 62
11.3 Dimensions .................................................................................................................... 66
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: 2016-01-20

4
1 About this document
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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andfaultrectication.Pleasereadthisinforma-
tion 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.
• 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 • 4 … 20 mA
45025-EN-160128
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 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. Also the pro-
tectivecharacteristicsoftheinstrumentcanbeinuenced.
2.4 General safety instructions
This is a high-tech instrument requiring the strict observance of stand-
ard regulations and guidelines. The user must take note of the safety
instructionsinthisoperatinginstructionsmanual,thecountry-specic
installation standards as well as all prevailing safety regulations and
accident prevention rules.
Theinstrumentmustonlybeoperatedinatechnicallyawlessand
reliable condition.The operator is responsible for trouble-free opera-
tion of the instrument.
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.
2.5 CE conformity
ThedevicefulllsthelegalrequirementsoftheapplicableECguide-
lines.ByaxingtheCEmarking,weconrmsuccessfultestingofthe
product.
YoucanndtheCECerticateofConformityinthedownloadsection
of our homepage.

6
2 For your safety
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
2.6 Permissible process pressure
Thepermissibleprocesspressureisspeciedonthetypelabelwith
"Process pressure", see chapter "Conguration". For safety reasons,
this range may not be exceeded. 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.
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llstherequirementsofthefollowingNAMURrecom-
mendations:
• NE 21 – Electromagnetic compatibility of equipment
• NE 43 – Signal level for malfunction information from measuring
transducers
• 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 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llthisobligationbyobservingtheenvironmental
instructions in this manual:
• Chapter "Packaging, transport and storage"
• Chapter "Disposal"

7
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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 Data-Matrix-Code for smartphone app
12 Symbol of the device protection class
13 ID numbers, 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 "VEGA Tools" and "Instrument search". 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

8
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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 "Software", included therein
– PACTware/DTM Collection
– Driver software
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

9
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
In combination with a slave sensor, VEGABAR 81 is also suitable for
electronicdierentialpressuremeasurement.
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
1
2
3
4
Fig. 3: 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.
Electronicdierential
pressure
Application area
Measured products
Chemical seal
Measuring system

10
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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. 4: Conguration of a measuring system with piezoresistive sensor element
1 Sensor element
2 Base element
3 Transmission liquid
4 Diaphragm
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 of VEGABAR series 80
are available in the special version "Oil and grease-free for oxygen
applications".
Pressure types
Seal concept

11
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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 %
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, the adjustment software
PACTware with VEGA-DTM is required.
Youcanndfurtherinformationintheoperatinginstructions"Interface
adapter VEGACONNECT" (Document-ID 32628).
VEGADIS 82 is suitable for measured value indication and adjustment
of sensors with HART protocol. It is looped into the 4 … 20 mA/HART
signal cable.
Packaging
Transport
Transport inspection
Storage
Storage and transport
temperature
PLICSCOM
VEGACONNECT
VEGADIS 82

12
3 Product description
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
Youcanndfurtherinformationintheoperatinginstructions"VE-
GADIS 82" (Document-ID 45300).
The overvoltage protection module is an accessory part for
4 … 20 mA and 4 … 20 mA/HART sensors.
Youcanndfurtherinformationintheoperatinginstructions"Over-
voltage protection module" (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.
Youcanndfurtherinformationintheoperatinginstructions"Elec-
tronics module VEGABAR series 80" (Document-ID 45054).
Overvoltage protection
module
Protective cap
Flanges
Welding socket
Electronics module

13
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
4 Mounting
4.1 General instructions
Make sure 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 are particularly:
• 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.
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 humidity is
expected (e.g. through cleaning processes) and on cooled or heated
vessels.
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.
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".
Suitability for the process
conditions
Protection against mois-
ture
Cable glands
Screwing in

14
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
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".
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. 5: Temperature ranges
1 Process temperature
2 Ambient temperature
4.2 Ventilation and pressure compensation
Ventilation and pressure compensation are carried out with VE-
GABAR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.
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)
Vibrations
Temperature limits
Filter elements
Instruments in non-Ex
and Ex-ia version

15
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
→ Turnthehousingsothatthelterelementpointsdownwardafter
the instrument is installed.This provides better protection against
buildup.
1 2 3
4 4 4
Fig. 6: Position of the lter element - non-Ex, Ex-ia version
1 Housing plastic, stainless steel precision casting
2 Housing aluminium
3 Housing stainless steel, electropolished
4 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)
→ 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. 7: Position of the lter element - Ex-d version
1 Single chamber housing, aluminium, stainless steel precision casting
2 Double chamber housing, aluminium, stainless steel precision casting
3 Rotatable metal ring
4 Filter element
Instruments in Ex-d ver-
sion

16
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
Instruments with absolute pressure have a blind plug mounted
insteadofthelterelement.
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. 8: 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.
1
2
3
Fig. 9: Measurement setup for process pressure measurement of gases in
pipelines
1 VEGABAR 81
2 Blocking valve
3 Pipeline
Keep the following in mind when setting up the measuring system:
Instruments in IP 69K
version
Measurement setup in
gases
Measurement setup in
vapours

17
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
• Connect via a siphon
• Do not insulate the siphon
• Fill the siphon with water before setup
1
4
3
2
1
2
3
4
Fig. 10: Measurement setup with process pressure measurement of gases in
pipelines
1 VEGABAR 81
2 Blocking valve
3 Siphon in U or circular form
4 Pipeline
A protective accumulation of water is formed through condensation
in the pipe bends. Even in applications with hot steam, a medium
temperature < 100 °C on the transmitter is ensured.
Keep the following in mind when setting up the measuring system:
• Mount the instrument below the measuring point
Theeectivepressurelineisalwayslledwithliquidandgasbubbles
can bubble up to the process line.
Measurement setup in
liquids

18
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
3
1
2
Fig. 11: Measurement setup for process pressure measurement of liquids in
pipelines
1 VEGABAR 81
2 Blocking valve
3 Pipeline
4.4 Level measurement
Keep the following in mind when setting up the measuring system:
• Mount the instrument below the min. level
• Donotmounttheinstrumentclosetothellingstreamoremptying
area
• Mount the instrument so that it is protected against pressure
shocks from the stirrer
Fig. 12: Measurement setup for level measurement
Measurement setup

19
4 Mounting
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
4.5 External housing
1
2
3
4
5
Fig. 13: Setup process assembly, external housing
1 Pipeline
2 Process assembly
3 Connection cable process assembly - External housing
4 External housing
5 Signal cable
1. Mark the holes according to the following drilling template
2. Fasten wall mounting plate with 4 screws
90 mm
(3.54")
R 3,5 mm
(0.14")
3mm
(0.12")
70 mm
(2.76")
8 mm
(0.32")
93 mm
(3.66")
110 mm
(4.33")
Fig. 14: Drilling template - wall mounting plate
Conguration
Mounting

20
5 Connecting to power supply
VEGABAR 81 • 4 … 20 mA
45025-EN-160128
5 Connecting to power supply
5.1 Preparing the connection
Always keep in mind the following safety instructions:
Warning:
Connect only in the complete absence of line voltage.
• The electrical connection must only be carried out by trained
personnel authorised by the plant operator.
• If overvoltage surges are expected, overvoltage arresters should
be installed.
Power supply and current signal are carried on the same two-wire
cable.Theoperatingvoltagecandierdependingontheinstrument
version.
Thedataforpowersupplyarespeciedinchapter"Technical data".
Provide a reliable separation between the supply circuit and the
mains circuits according to DIN EN 61140 VDE 0140-1.
Keepinmindthefollowingadditionalfactorsthatinuencetheoperat-
ing voltage:
• Lower output voltage of the power supply unit under nominal load
(e.g. with a sensor current of 20.5 mA or 22 mA in case of fault)
• Inuenceofadditionalinstrumentsinthecircuit(seeloadvaluesin
chapter "Technical data")
The instrument is connected with standard two-wire cable without
screen. If electromagnetic interference is expected which is above the
test values of EN 61326-1 for industrial areas, screened cable should
be used.
Use cable with round cross section for instruments with housing and
cablegland.Toensurethesealeectofthecablegland(IPprotection
rating),ndoutwhichcableouterdiameterthecableglandissuitable
for.
Useacableglandttingthecablediameter.
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.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
Safety instructions
Voltage supply
Connection cable
Cable glands