Operating Instructions
VEGABAR 74
4 … 20 mA/HART
Process pressure/
Hydrostatic
p
Contents
1 About this document
1.1 Function . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
5
1.2 Target group . . . . . . . . . . . . . . . . . . . . . . . . . .
5
1.3 Symbolism used . . . . . . . . . . . . . . . . . . . . . . .
5
2 For your safety
2.1 Authorised personnel. . . . . . . . . . . . . . . . . . . .
6
2.2 Appropriate use. . . . . . . . . . . . . . . . . . . . . . . .
6
2.3 Warning about misuse . . . . . . . . . . . . . . . . . . .
6
2.4 General safety instructions . . . . . . . . . . . . . . . .
6
2.5 Safety approval markings and safety tips . . . . .
7
2.6 CE conformity . . . . . . . . . . . . . . . . . . . . . . . . .
7
2.7 Fulfilling NAMUR recommendations . . . . . . . . .
7
2.8 Safety instructions for Ex areas . . . . . . . . . . . .
8
2.9 Environmental instructions . . . . . . . . . . . . . . . .
8
3 Product description
3.1 Configuration. . . . . . . . . . . . . . . . . . . . . . . . . .
9
3.2 Principle of operation . . . . . . . . . . . . . . . . . . . .
10
3.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
3.4 Packaging, transport and storage . . . . . . . . . . .
11
4 Mounting
4.1 General instructions. . . . . . . . . . . . . . . . . . . . .
12
4.2 Mounting steps . . . . . . . . . . . . . . . . . . . . . . . .
13
5 Connecting to power supply
5.1 Preparing the connection . . . . . . . . . . . . . . . . .
14
5.2 Connection procedure . . . . . . . . . . . . . . . . . . .
16
5.3 Wiring plan . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
6 Set up
6.1 Setup steps without VEGADIS 12 . . . . . . . . . . .
19
6.2 Setup steps with VEGADIS 12 . . . . . . . . . . . . .
19
7 Setup with PACTware™
7.1 Connect the PC with VEGACONNECT 3 . . . . .
22
7.2 Connect the PC with VEGACONNECT 4 . . . . .
23
7.3 Parameter adjustment with PACTware™. . . . . .
24
7.4 Parameter adjustment with AMS™ and PDM . .
24
7.5 Saving the parameter adjustment data . . . . . . .
24
2 VEGABAR 74 - 4 … 20 mA/HART
Contents
28432-EN-070718
8 Maintenance and fault rectification
8.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .
25
8.2 Fault clearance . . . . . . . . . . . . . . . . . . . . . . . .
25
8.3 Instrument repair . . . . . . . . . . . . . . . . . . . . . . .
26
9 Dismounting
9.1 Dismounting steps. . . . . . . . . . . . . . . . . . . . . .
27
9.2 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
10 Supplement
10.1 Technical data. . . . . . . . . . . . . . . . . . . . . . . . .
28
10.2 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . .
35
10.3 Industrial property rights. . . . . . . . . . . . . . . . . .
41
10.4 Trademark . . . . . . . . . . . . . . . . . . . . . . . . . . .
41
Supplementary documentation
Information:
Depending on the ordered version, supplementary documentation belongs to the scope of delivery. You find this
documentation in chapter "Product description".
Instructions manuals for accessories and replacement
parts
Tip:
To ensure reliable setup and operation of your VEGABAR 74,
we offer accessories and replacement parts. The associated
documents are:
l Supplementary instructions manual 3203
6 "Welded socket
and seals"
l Operating instructions manual 32798 "Breather housing
VEGABOX 02"
l Operatin
g instructions manual 20591 "External indicating
and adjustment unit VEGADIS 12"
VEGABAR 74 - 4 … 20 mA/HART 3
Contents
28432-EN-070718
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 instructions for maintenance and fault rectification.
Please read this information before putting the instrument into
operation and keep this manual accessible in the immediate
vicinity of the device.
1.2 Target group
This operating instructions manual is directed to trained
personnel. The contents of this manual should be made
available to these personnel and put into practice by them.
1.3 Symbolism used
Information, tip, note
This symbol indicates helpful additional information.
Caution: If this warning is ignored, faults or malfunc-
tions 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.
l List
The dot set in
front indicates a list with no implied sequence.
à Action
This arrow indicates a
single action.
1 Sequence
Numbers set in front indicate successive steps in a procedure.
4 VEGABAR 74 - 4 … 20 mA/HART
About this document
28432-EN-070718
2 For your safety
2.1 Authorised personnel
All operations descr
ibed in this operating instructions manual
must be carried out only by trained specialist personnel
authorised by the operator.
During work on and with the device the required personal
protection equipment must always be worn.
2.2 Appropriate use
VEGABAR 74 is a pressure transmitter for measurement of
gauge pressure, absolute pressure and vacuum.
You can find detailed information on the application range in
chapter "Product description".
Operational reliability is ensured only if the instrument is
properly used according to the specifications in the operating
instructions manual as well as possible supplementary
instructions.
Due to 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. Arbitrary conversions or modifications are
explicitly forbidden.
2.3 Warning about misuse
Inappropriate or incorrect use of the instrument can give rise to
application-specific hazards, e.g. vessel overfill or damage to
system components through incorrect mounting or adjustment.
2.4 General safety instructions
This is a high-tech instrument requiring the strict observance of
standard regulations and guidelines. The user must take note
of the safety instructions in this operating instructions manual,
the country-specific installation standards as well as all
prevailing safety regulations and accident prevention rules.
The instrument must only be operated in a technically flawless
and reliable condition. The operator is responsible for troublefree operation of the instrument.
VEGABAR 74 - 4 … 20 mA/HART 5
For your safety
28432-EN-070718
During the entire duration of use, the user is obliged to
determine the compliance of the required occupational safety
measures with the current valid rules and regulations and also
take note of new regulations.
2.5 Safety approval markings and safety tips
The safety approval markings and safety tips on the device
must be observed.
2.6 CE conformity
VEGABAR 74 is in CE conformity with EMC (89/336/EWG),
fulfils NAMUR recommendation NE 21 and is in CE conformity
with LVD (73/23/EWG).
Conformity has been judged according to the following
standards:
l EMC:
- Emission EN 61326: 2004 (class B)
- Susceptibil
ity EN 6132
6: 2004 including
supplement A
l LVD: EN 61010-1: 2001
VEGABAR 74 is not subject to the pressure device guideline.
1)
2.7 Fulfilling NAMUR recom
mendations
VEGABAR 74 fulfills the following NAMUR recommendations:
l NE 21 (interference resistane and emitted interference)
l NE 43 (signal level for failure
information)
l NE 53 (compatibility sensor and indicating/adjustment
components)
VEGA instruments are generally upward and downward
compatible:
l Sensor
software to DTM VEGABAR 74 HART
l DTM
VEGABAR 74 for adjustment software PACTware™
The parameter adjustment of the basic sensor functions is
independent of the software version. The range of available
functions depends on the respective software version of the
individual components.
The software version of VEGABAR 74 HART can be read out
via PACTware™.
1)
Due to the flush diaphragm, no own pressure compartment is formed.
6 VEGABAR 74 - 4 … 20 mA/HART
For your safety
28432-EN-070718
You can view all software histories on our website www.vega.
com. Make use of this advantage and get registered for update
information via e-mail.
2.8 Safety instructions for Ex areas
Please note the Ex-specific safety information for installation
and operation in Ex areas. These safety instructions are part of
the operating instructions manual and come with the Exapproved instruments.
2.9 Environmental instructions
Protection of the environment is one of our most important
duties. That is why we have introduced an environment
management system with the goal of continuously improving
company environmental protection. The environment management system is certified according to DIN EN ISO 14001.
Please help us fulfil this obligation by observing the environmental instructions in this manual:
l Chapter "Packaging, transport
and
storage"
l Chapter "D isposal"
VEGABAR 74 - 4 … 20 mA/HART 7
For your safety
28432-EN-070718
3 Product description
3.1 Configuration
The scope
of delivery encompasses:
l VEGABAR 74 pressure transmitter
l Documentation
- this
operating instructions manual
- Test certificate for pressure transmitters
- Ex-specific "Safety instructions" (with Ex-versions)
- if necessary, further certificates
VEGABAR 74 consists of the following components:
l Process fitting
with measuring cell
l Housing
with electronics
l Connection cable (direct cable outlet)
The
components are available in different versions.
1
2
3
Fig. 1: Example of a VEGABAR 74 with process fitting G1½ A
1 Connection cable
2 Housing with electronics
3 Process fitting with measuring cell
Scope of delivery
Components
8 VEGABAR 74 - 4 … 20 mA/HART
Product description
28432-EN-070718
3.2 Principle of operation
VEGABAR 74 is a pressure transmitter for use in the paper,
food processing and pharmaceutical industry. Thanks to the
high protection class IP 68/IP 69K it is particularly suitable for
use in humid environment. Depending on the version, it is used
for level, gauge pressure, absolute pressure or vacuum
measurements. Measured products are gases, vapours and
liquids, also with abrasive contents.
The sensor element is the CERTEC
®
measuring cell with
flush, abrasion resistant ceramic diaphragm. The hydrostatic
pressure of the medium or the process pressure causes a
capacitance change in the measuring cell via the diaphragm.
This change is converted into an appropriate output signal and
outputted as measured value.
The CERTEC
®
measuring cell is also equipped with a
temperature sensor. The temperature value can be processed
via the signal output.
Two-wire electronics 4 … 20 mA/HART for power supply and
measured value transmission over the same cable.
The supply voltage range can differ depending on the
instrument version.
The data for power supply are stated in chapter "Technical
data" in the "Supplement".
3.3 Operation
VEGABAR 74 4 … 20 mA/HART can be adjusted with different
adjustment media:
l with external adjustment/indication VEGADIS 12
l an adjustment software according to FDT/DTM stan
dard,
e.g. PACTware™ and PC
l with
a HART handheld
The kind
of adjustment and the adjustment options depend on
the selected adjustment component. The entered parameters
are generally saved in the respecitive sensor, when adjusting
with PACTware™ and PC optionally also in the PC.
Area of application
Functional principle
Supply
VEGABAR 74 - 4 … 20 mA/HART 9
Product description
28432-EN-070718
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 according to DIN EN 24180.
The packaging of standard instruments consists of environ-
ment-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 under 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 concealed 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:
l Not
in the open
l Dry and dust free
l Not exposed to corrosive media
l Protected against solar
radiation
l Avoiding mechanical shock and vibration
l Storage and transport temperature see "Supplement -
Technical data - Ambient condi
tions"
l Relative humidity 20 … 85 %
Packaging
Transp
ort
Transport inspection
Storage
Storage and transport tem-
perature
10 VEGABAR 74 - 4 … 20 mA/HART
Product description
28432-EN-070718
4 Mounting
4.1 General instructions
Make sure that
the wetted parts of VEGABAR 74, especially
the seal and process fitting, are suitable for the existing
process conditions such as pressure, temperature etc. as well
as the chemical properties of the medium.
You can find the specifications in chapter "Technical data" in
the "Supplement".
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 housing and connection cable are not exceeded.
1
2
Fig. 2: Temperature ranges
1 Process temperature
2 Ambient temperature
l The connection cable has a capillary for atmospheric
pressure compensation
à Lead the cable end into a dry space or into a suitable
terminal housing.
Information:
VEGA recommends the breather housing VEGABOX 02 or the
indication/adjustment VEGADIS 12. Both contain terminals
and a ventilation filter for pressure compensation. For
mounting outdoors, a suitable protective cover is available.
Materials, wetted parts
Temperature limits
Connection
VEGABAR 74 - 4 … 20 mA/HART 11
Mounting
28432-EN-070718
4.2 Mounting steps
Seal the thread with teflon, hemp or a similar resistant seal
material on the process fitting thread 1½ NPT.
à Screw VEGABAR 74 into the welded socket. Tighten the
hexagon on the process fitting with a suitable wrench.
Wrench size, see chapter "Dimensions".
Seal the flange connections according to DIN/ANSI with a
suitable, resistant seal and mount VEGABAR 74 with suitable
screws.
Use the seal suitable for the respective process fitting. You can
find the components in the line of VEGA accessories in the
supplementary instructions manual "Welded socket and
seals".
Sealing/Screwing in threaded
versions
Sealing/Screwing in flange
versions
Sealing/Screwing in hygienic
fittings
12 VEGABAR 74 - 4 … 20 mA/HART
Mounting
28432-EN-070718
5 Connecting to power supply
5.1 Preparing the
connection
Always keep in mind the following safety instructions:
l Connect only in the complete absence of line voltage
l If overvoltage surges are expected, versions with inte-
grated
overvoltage arresters should be used or external
overvoltage arresters should be installed
Tip:
We recommend the version of VEGABAR 74 with integrated
overvoltage arrester or VEGA type ÜSB62-36G.X as external
overvoltage arreaster.
In hazardous areas you should take note of the appropriate
regulations, conformity and type approval certificates of the
sensors and power supply units.
Power supply and current signal are carried on the same twowire cable. The voltage supply range can differ depending on
the instrument version.
The data for power supply are stated in chapter "Technical
data" in the "Supplement".
Provide a reliable separation of the supply circuit from the
mains circuits according to DIN VDE 0106 part 101.
VEGA power supply units VEGATRENN 149AEx, VEGASTAB
690, VEGADIS 371 as well as all VEGAMETs meet this
requirement. When using one of these instruments, protection
class III is ensured for VEGABAR 74.
Bear in mind the following factors regarding supply voltage:
l Outpu
t voltage of the power supply unit can be lower under
nominal
load (with a sensor current of 20.5 mA or 22 mA in
case of fault message)
l Influence
of additional instruments in the circuit (see load
values in chapter "Technical data")
VEGABAR 74 is connected with standard two-wire cable
without screen. An outer cable diameter of 5 … 9 mm ensures
the seal effect of the cable gland when connecting via
VEGABOX 02 or VEGADIS 12. If electromagnetic interference
is expected which is above the test values of EN 61326 for
Note safety instructions
Take note of safety
instructions for Ex
applications
Select power supply
Selecting connection cable
VEGABAR 74 - 4 … 20 mA/HART 13
Connecting to power supply
28432-EN-070718
industrial areas, screened cable should be used. For HART
multidrop operation we recommend as standard practice the
use of screened cable.
1
2
Fig. 3: Connection of VEGABAR 74
1 Direct connection
2 Connection via VEGABOX 02 or VEGADIS 12
If screened cable is necessary, connect the cable screen on
both ends to ground potential. In the VEGABOX 02 or
VEGADIS 12, the screen must be connected directly to the
internal ground terminal. The ground terminal on the outside of
the housing must be connected to the potential equalisation
(low impedance).
If potential equalisation currents are expected, the connection
on the processing side must be made via a ceramic capacitor
(e.g. 1 nF, 1500 V). The low frequency potential equalisation
currents are thus suppressed, but the protective effect against
high frequency interference signals remains.
Take note of the corresponding installation regulations for Ex
applications. In particular, make sure that no potential equalisation currents flow over the cable screen. In case of
grounding on both sides this can be achieved by the use of a
capacitor or a separate potential equalisation.
Cable screening and grounding
Select connection
cable for Ex applications
14 VEGABAR 74 - 4 … 20 mA/HART
Connecting to power supply
28432-EN-070718