Operating Instructions
VEGAPULS 41 (Profibus PA)
PROF I
PROCESS FIELD BUS
BUS
Contents
Safety information ........................................................................ 3
Note Ex area ................................................................................ 3
1 Product description .................................................................. 4
1.1 Function................................................................................. 4
1.2 Application features ............................................................. 6
1.3 Profibus output signal .......................................................... 7
1.4 Adjustment ............................................................................ 8
1.5 Type survey ........................................................................ 12
1.6 Antennas............................................................................. 12
2 Mounting and installation ..................................................... 13
2.1 General installation instructions ........................................ 13
2.2 Measurement of liquids ..................................................... 16
2.3 Measurement in standpipe (surge or bypass tube) ...... 17
2.4 False echoes ...................................................................... 22
2.5 Common installation mistakes ........................................... 24
Contents
3 Electrical connection .............................................................. 26
3.1 Connection – Connection cable – Screening ................... 26
3.2 Sensor address ................................................................. 29
3.3 Connecting the sensor ...................................................... 31
3.4 Connecting the external indicating instrument ................ 32
3.5 Bus configuration ............................................................... 33
2 VEGAPULS 41 – Profibus PA
27292-EN-041227
Contents
4 Set-up ........................................................................................ 38
4.1 Adjustment media .............................................................. 38
4.2 Adjusting the sensor with the adjustment module
MINICOM ............................................................................ 38
6 Diagnostics............................................................................... 44
6.1 Simulation ............................................................................ 44
6.2 Error codes ........................................................................ 44
7 Technical data .......................................................................... 45
7.1 Technical data ..................................................................... 45
7.2 Approvals ........................................................................... 49
7.3 Data format of the output signal ........................................ 50
7.4 Dimensions ......................................................................... 51
7.5 CE conformity declaration ................................................. 53
Safety information
Please read this manual carefully, and also take
note of country-specific installation standards
(e.g. the VDE regulations in Germany) as well
as all prevailing safety regulations and accident prevention rules.
For safety and warranty reasons, any internal
work on the instruments, apart from that involved in normal installation and electrical connection, must be carried out only by qualified
VEGA personnel.
27292-EN-041227
VEGAPULS 41 – Profibus PA 3
Note Ex area
Please note the attached safety instructions
containing important information on installation
and operation in Ex areas.
These safety instructions are part of the operating instructions manual and come with the Ex
approved instruments.
1 Product description
Product description
Radar sensors usually come with horn or rod
antennas. PTFE rod antennas are suitable for
many applications with chemically aggressive products, but are unsuitable for small
vessels due to their size. Also the reception
efficiency of the rod antenna is lower than that
of the (less resistant) horn antenna. The two
new radar sensors, VEGAPULS 43 with DN
50 and DN 80 process fittings and the described VEGAPULS 41 with 1½“ process
fitting, perfectly round out the instrument
series. Horn and rod antennas that protrude
into the vessel belong to the past. The antenna of VEGAPULS 41 consists of a small
40 mm TFM-PTFE cone that is suitable for
chemically aggressive environments.
Fluorothermoplasts and perfluoroelastomers
(PTFE) have been known as the „Mercedes“
of plastic materials for many years. They are
resistant to virtually all chemical media, such
as e.g. amines, ketones, esters, acids (sulphuric acid, phosphoric acid, hydrochloric
acid, nitric acid), alkalis (caustic soda), oxidants, fuels and oils. These plastics do not
become brittle or age and are suitable for
temperatures up to 150°C. The only limits to
these materials are applications with fluorine
under high pressure or with liquid alkali metals (sodium or potassium), where adverse
reactions may occur. The cone acts like a
lens that focuses short (0.15 mW) radar
pulses into a beam and sends them towards
the product. During the pulse breaks, the
cones operate like a unidirectional microphone with optimum reception efficiency. The
intelligent, extremely fast electronics converts
the radar echo into a precise image of the
environment and level, which is outputted as
a 4 … 20 mA or Profibus signal.
Due to their small housing dimensions and
process fittings, the compact sensors are
unobtrusive and, above all, cost-effective
monitors of your product levels. With their
integrated display, they enable highprecision level measurements and can be
used for applications in which the
advantages of non-contact measurement
could never before be realized.
VEGAPULS radar sensors are perfectly
adapted to two-wire technology. The supply
voltage and the output signal are transmitted
via one two-wire cable. The instruments
produce an analogue 4 … 20 mA signal as
output, i.e. measuring signal.
1.1 Function
Radio detecting and ranging: Radar.
VEGAPULS radar sensors are used for noncontact, continuous distance measurement.
The measured distance corresponds to a
filling height and is outputted as level.
Measuring principle:
emission – reflection – reception
Extremely small 26 GHz radar signals are
emitted from the antenna of the radar sensor
as short pulses. The radar pulses reflected
by the sensor environment and the product
are received by the antenna as radar echoes. The running period of the radar pulses
from emission to reception is proportional to
the distance and hence to the level.
4 VEGAPULS 41 – Profibus PA
27292-EN-041227
Product description
Meas.
distance
emission - reflection - reception
The radar pulses are emitted by the antenna
system as pulse packages with a pulse
duration of 1 ns and pulse intervals of
278 ns; this corresponds to a pulse package
frequency of 3.6 MHz. In the pulse intervals,
the antenna system operates as a receiver.
Signal running periods of less than one billionth of a second must be processed and
the echo image evaluated in a fraction of a
second.
1 ns
278 ns
Hence, it is possible for the radar sensors to
process the slow-motion pictures of the sensor environment precisely and in detail in
cycles of 0.5 to 1 second without using timeconsuming frequency analysis (e.g. FMCW,
required by other radar techniques).
Nearly all products can be measured
Radar signals display physical properties
similar to those of visible light. According to
the quantum theory, they propagate through
empty space. Hence, they are not dependent on a conductive medium (air), and they
spread out like light at the speed of light.
Radar signals react to two basic electrical
properties:
- the electrical conductivity of a substance
- the dielectric constant of a substance.
All products which are electrically conductive
reflect radar signals very well. Even slightly
conductive products provide a sufficiently
strong reflection for a reliable measurement.
All products with a dielectric constant ε
greater than 2.0 reflect radar pulses sufficiently (note: air has a dielectric constant εr of
1). Signal reflectivity grows stronger with
increasing conductivity or increasing dielectric constant of the product. Hence, nearly all
substances can be measured.
r
Pulse sequence
VEGAPULS radar sensors can achieve this
through a special time transformation procedure which spreads out the more than 3.6
million echo images per second into a quasi
slow-motion picture, then freezes and processes them.
%
50
40
30
20
10
5 %
5
0
2
0
25 %
4 6 8 12 14 16 18
10
40 %
20
ε
Reflected radar power dependent on the dielectric
constant of the measured product
tt
Time transformation
27292-EN-041227
VEGAPULS 41 – Profibus PA 5
r
Product description
With standard flanges of DN 50 to DN 150,
ANSI 2“ to ANSI 6“ or G 1½ A and 1½“ NPT,
the sensor antenna systems can be adapted
to various products and measuring environments.
The high-quality materials can also withstand
extreme chemical and physical conditions.
The sensors deliver stable, reproducible
analogue or digital level signals with reliability
and precision.
Continuous and reliable
Unaffected by temperature, pressure and
individual atmosphere content, VEGAPULS
radar sensors are used for quick and reliable
continuous level measurement of widely varying products.
%
0,03
0,02
0,01
0
100 500 1000 1300 ˚C
0
0,018 %
Temperature influence: Temperature error absolutely
zero (e.g. at 500°C 0.018 %)
%
10
5
0,29 %
0
10
0
1,44 %
20 30 40 60
50
Pressure influence: Error with pressure increase very
low (e.g. at 50 bar 1.44 %)
0,023 %
2,8 %
70 80 90 110 120 130 140
100
3,89 %
bar
1.2 Application features
Applications
• level measurement of any liquid
• measurement also in vacuum
• all slightly conductive materials and all
substances with a dielectric constant > 2.0
can be measured
• measuring range 0 … 10 m.
Two-wire technology
• power supply and output signal on one
two-wire cable (loop powered)
• Profibus PA (Profile 3).
Rugged and abrasionproof
• non-contact
• high-resistance materials
Exact and reliable
• accuracy 0.05 %.
• resolution 1 mm
• unaffected by noise, vapours, dusts, gas
compositions and inert gas stratification
• unaffected by varying density and temperature of the medium
• measurement in pressures up to 3 bar and
product temperatures up to 150°C.
Communicative
• integrated measured value display
• optional display module separate from
sensor
• adjustment with detachable adjustment
module, pluggable in the sensor or in the
external display
• adjustment with HART
• adjustment with the PC.
®
handheld
Approvals
• CENELEC, ATEX, PTB, FM, CSA, ABS,
LRS, GL, LR, FCC.
6 VEGAPULS 41 – Profibus PA
27292-EN-041227
Product description
1.3 Profibus output signal
PROPRO
PROcess
PROPRO
sult of a joint project of thirteen companies
and five universities. The companies Bosch,
Klöckner-Möller and Siemens played a decisive role. The specifications of the bus are
described in the protocol layers 1, 2 and 7 of
the ISO/OSI reference model and are available from the PNO (Profibus user organisation). Since layers 3 … 5 have not yet been
developed as a standard, Profibus still has a
lot of far-reaching potential.
Today approx. 600 companies make use of
Profibus technology and belong to the PNO.
Profibus
Specification, Profibus
Periphery and Profibus
mation.
As a process automation bus, Profibus PA
also enables power supply over the bus. Up
to 32 sensors can be operated on a shielded
two-wire cable that carries both power supply and measurement signal. In Ex areas, up
to ten sensors can be connected from the PA
level to one two-wire cable (EEx ia).
Bus structure
The Profibus DP and PA network consists of
up to 126 master and slave participants.
Data are always exchanged from point to
point, with the data traffic being exclusively
controlled and checked by master devices.
Communication is carried out acc. to the
Token-Passing procedure. This means that
the master holding the Token can contact the
slaves, give instructions, enquire data and
cause the slaves to receive and transmit
data. After the work is done or after a predetermined time interval, the Token is passed
on by the master to the next master.
FIFI
BUSBUS
FIeld
BUS (PROFIBUS) is the re-
FIFI
BUSBUS
FMSFMS
FMS stands for Fieldbus Messaging
FMSFMS
DPDP
DP for Decentralised
DPDP
PP
AA
P
A for Process Auto-
PP
AA
Master-Class 1
is the actual automation system, i.e. the process control computer or the PLC that enquires and processes all measured values.
Master-Class 2
One or several Master-Class 2 can operate in
a Profibus network. As a rule, Master-Class 2
devices are engineering, adjustment or visualisation stations. The VEGA adjustment software VVO (VEGA Visual Operating) operates
as Master-Class 2 participant on the DP bus
and can work on an engineering PC, on an
adjustment PC or on the process control
computer and can access any VEGA sensor
on the PA level.
Instrument master file
A so-called GSD file is delivered with every
VEGAPULS Profibus sensor. This file is required to integrate the sensor into the bus
system. The GSD (instrument master file)
contains, beside the sensor name and the
manufacturer, the sensor-specific communication parameters which are necessary for a
stable integration of the sensor in the bus.
Load the GSD file belonging to the sensor
into your bus configuration program. If the
GSD file is not available, it can be
downloaded from the VEGA homepage: http:/
/www.vega.com.
Do not confuse the GSD file with the EDD
(Electronic Device Description), a file which is
necessary for the PDM environment (this can
be also found on the VEGA homepage).
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VEGAPULS 41 – Profibus PA 7
Product description
1.4 Adjustment
Every measurement set-up is unique. For
that reason, every radar sensor needs, beside the adjustment, some basic information
on the application and the environment, e.g.
which level means "empty“ and which level
"full“. Beside this "empty and full adjustment“,
many other settings and adjustments are
possible with VEGAPULS radar sensors. The
output of echo curves and the calculation of
vessel linearisation curves by means of vessel dimensions are only two examples.
Profibus adjustment structure
In the Profibus environment, there are different adjustment concepts and adjustment
tools which often differ considerably from
manufacturer to manufacturer. From the user’s point of view, the ideal solution would be
a manufacturer-independent adjustment
program which could be operated directly on
the Profibus DP/PA, on the sensor, as well as
at any system node (e.g. an engineering
station or the process control center).
In the past, only the program „SIMATIC
PDM“, based on the HART
structure, could fulfil this wish (though with
the limitations common to HART
®
HART
, the availability of an instrument-specific database for a comprehensive adjustment with PDM (Process Device Managing)
is a requirement. Otherwise, only the basic
instrument functions, such as adjustment, are
available. In the PDM environment, this instrument-specific database is called EDD (Electronic Device Description), in perfect analogy
to the HART
®
environment which also requires, except with VEGA HART
ments, a DD (Device Description) for each
sensor.
®
adjustment
®
). As with
®
instru-
The disadvantages of the HART
®
environment
are well known: for each sensor/participant,
an individual DD must be loaded, which in
addition, must always be the latest and most
up-to-date DD. Special adjustment options
such as e.g. the output of an echo curve, are
available neither with HART
®
nor with PDM.
User-friendly adjustment is out of the question. With VEGA’s adjustment software VVO,
those restrictions belong to the past.
The legitimate wish of many Profibus users
for a manufacturer-independent adjustment
tool without EDD has been realised in the
form of PACTware
number of process technology companies
developed PACTware
CC
tion
Configuration
CC
TM
. An association of a
TM
PP
: a
Process
TT
Tool that can run different
TT
PP
AA
Automa-
AA
manufacturer software tools under a standardized user interface and adjustment structure. Specialists call this technology Field
Device Transcription (FDT). Just as different
Windows printer drivers enable operation of
completely different printers under a single
user interface, PACTware
TM
enables operation
of all field instruments under a single user
interface. Instrument-specific databases
(EDD), like those for SIMATIC PDM, are not
required.
As a result of this development, four adjustment media are available for VEGA Profibus
sensors:
- adjustment with the PC and the adjustment
program VVO (VEGA Visual Operating) as
stand-alone tool, on the segment coupler
or directly on the sensor
- adjustment with the detachable adjustment
module MINICOM in the sensor
- adjustment with the SIMATIC PDM adjust-
ment program (requires EDD instrument
databases) from process control
- adjustment with the manufacturer-inde-
pendent user interface PACTware
TM
on the
sensor, from process control or on the
segment coupler.
8 VEGAPULS 41 – Profibus PA
27292-EN-041227
Product description
Adjustment with the PC
Generally, the set-up and adjustment of radar
sensors is most conveniently carried out on
the PC with the adjustment program
PAC Twa re
leads quickly through adjustment and parameter setting by means of pictures, graphics and process visualisations.
The adjustment software PACT
the FDT concept (Field Device Tool) operates
as an independent adjustment program on
any PC, engineering station or process control computer.
The adjustment program requires for communication with Profibus sensors either a
Profibus-Master-Class2 interface card or the
interface adapter VEGACONNECT 3. The PC
with the Profibus interface card can be connected directly to any point on the DP bus
with the standard RS 485 Profibus cable. In
conjunction with the adapter
VEGACONNECT, the PC can be connected
directly to the sensor. VEGACONNECT communicates via a small plug directly with the
individual sensor.
The adjustment and parameter data can be
saved at any time on the PC with the adjustment software and can be protected by
passwords. If necessary, the adjustments
can be transferred quickly to other sensors.
In practice, the adjustment software
PAC T
engineering station or an operating station.
As a Master-Class 2 operating via the
Profibus interface card (e.g. from Softing), it
accesses VEGA sensors directly over the
bus, from the DP level to the PA via the segment coupler.
TM
under Windows®. The program
TM
ware
is often installed as a tool on an
ware
TM
acc. to
Beside the instrument master file (GSD), with
which a sensor is logged into the Profibus
system, most Profibus sensors require, in
addition, a so-called EDD (Electronic Device
Description) for each individual sensor, to
enable access and adjustment from the bus
level.
27292-EN-041227
VEGAPULS 41 – Profibus PA 9
PACTware
SPS
Adr. 10
Master-Class 1
Adr. 1
Profibus DP interface card as
Master-Class 2 (e.g. Softing)
3
Product description
Adr. 60
Adr. 59
Adr. 21
Adr. 22
3
Adr. 23
DP-Bus
Adr. 24
Adr. 57
Adr. 58
Segment coupler
Adr. 25
Adr. 25 … 56
PA-
Bus
Adr. 26
2
Adr. 27
(max. 32 participants)
Adr. 28
Adr. 29
Adjustment of the VEGAPULS radar sensors from process control via a Profibus interface card in the process
control computer or in an additional PC. The adjustment software VEGA Visual Operating (VVO) accesses the
sensors bidirectionally via the interface (interface card).
27292-EN-041227
10 VEGAPULS 41 – Profibus PA
Product description
Adjustment with the adjustment module
MINICOM
The small (3.2 cm x 6.7 cm) 6-key adjustment
module with display allows the adjustment to
be carried out in clear text dialogue. The
adjustment module can be plugged into the
radar sensor or into the optional, external
indicating instrument.
Tank 1
m (d)
12.345
Detachable adjustment module MINICOM
Unauthorised sensor adjustments can be
prevented by removing the adjustment module.
ESC
+
-
OK
Adjustment with SIMA TIC PDM adjustment program
To adjust all essential functions of the VEGA
sensor with the adjustment station SIMATIC
PDM from Siemens, a so-called EDD is required. Without this EDD, only the basic functions such as min./max. wet adjustment or
integration time can be adjusted with the
PDM adjustment program. Further important
adjustment functions, such as the input of the
meas. environment or a false echo storage
are not available without EDD. After integration of the EDD files in the Simatic PDM adjustment software, all important adjustment
functions are accessible. If it is not at hand,
the obligatory GSD (instrument master file)
as well as the EDD (Electronic Device Description) necessary for PDM can be
downloaded from the VEGA homepage
(www.vega.com).
ESC
+
-
Tank 1
m (d)
OK
12.345
2
-
Tank 1
m (d)
12.345
PA- Bus
ESC
+
OK
4
max. 25 m
Adjustment with detachable adjustment module. The
adjustment module can be plugged into the radar
sensor or into the external indicating instrument
VEGADIS 50.
27292-EN-041227
VEGAPULS 41 – Profibus PA 11
Types and versions
1.5 T ype survey
VEGAPULS 41 sensors are manufactured
with process connection G 1½ A or 1½“ NPT.
Features
• Application preferably for liquids in storage
tanks and process vessels with increased
accuracy requirements and in corrosive
environments.
• Measuring range 0 … 10 m
• Ex approved in Zone 1 (IEC) or Zone 1
(ATEX) classification mark
EEx ia [ia] IIC T6.
• Integrated measured value display.
1.6 Antennas
The antenna is the eye of the radar sensor.
The shape of the antenna, however, doesn’t
give a casual observer the lightest clue on
how carefully the antenna geometry must be
adapted to the physical properties of electromagnetic waves. VEGAPULS 41 radar sensors are equipped with a completely
encapsulated antenna.
PTFE is commonly found in hygienic applications. The small plastic cone of the
VEGAPULS 41 radar sensor, operating as
antenna, consists of a TFM-PTFE material.
This is a fluorothermoplast, which has additional distinct advantages compared to PTFE,
such as, e.g., reduced load deformation,
denser polymer structure as well as a
smoother surface (Ra < 0.8 µm). The other
known advantages of PTFE, such as, e.g.,
high temperature resistance (up to 150°C),
high chemical resistance as well as resistance to brittleness and ageing are still
present or have even been enhanced.
Perfluorelastomers and fluorothermoplasts
are resistant to virtually all chemical media
such as, e.g., amines, ketones, esters, acids
(sulphuric acid, phosphoric acid, hydrochloric acid, nitric acid), alkalis (caustic soda),
oxidants, fuels and oils. Beside their use in
the chemical industry, these materials are
being applied more and more in sterilisation
and pharmaceutical technologies. The only
limits to these materials are in applications
with fluorine under high pressure or with
liquid alkali metals (sodium or potassium),
where explosive reactions may occur.
12 VEGAPULS 41 – Profibus PA
27292-EN-041227
Mounting and installation
2 Mounting and installation
2.1 General installation instructions
Measuring range
The reference plane for the
measuring range of the sensor
is the lower edge of the flange.
Keep in mind that in measuring
environments where the medium can reach the sensor
flange, buildup can form on the
antenna, possibly causing
measurement errors.
Note: Series 40 sensors are
suitable for measurement of
solids only under certain conditions.
empty
full
Measuring range (operating range) and max. measuring distance
Note: Use of the sensors for applications with solids is limited.
max.
Meas. range
Reference plan
max.
min.
False echoes
Flat obstructions and struts cause strong
false echoes. They reflect the radar signal
with high energy density.
Interfering surfaces with rounded profiles
scatter the radar signals into the surrounding
space more diffusely and thus generate false
If flat obstructions in the range of the radar
signals cannot be avoided, we recommend
diverting the interfering signals with a deflector. The deflector prevents the interfering
signals from being directly received by the
radar sensor. The signals are then so lowenergy and diffuse that they can be filtered
out by the sensor.
echoes with a lower energy density. Hence,
those reflections are less critical than those
from a flat surface.
Round profiles diffuse radar signals
Profile with smooth interfering surfaces cause large
false signals
Cover smooth, flat surface with deflectors
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VEGAPULS 41 – Profibus PA 13
Mounting and installation
Emission cone and false echoes
The radar signals are focused by the antenna system. The signals leave the antenna
in a conical path similar to the beam pattern
of a spotlight. This emission cone depends
on the antenna used. Any object in this beam
cone will reflect the radar signals. Within the
first few meters of the beam cone, tubes,
struts or other installations can interfere with
the measurement. At a distance of 6 m, the
false echo of a strut has an amplitude nine
times greater than at a distance of 18 m.
At greater distances, the energy of the radar
signal distributes itself over a larger area,
thus causing weaker echoes from obstructing surfaces. The interfering signals are
therefore less critical than those at close
range.
If possible, orient the sensor axis perpendicularly to the product surface and keep
vessel installations (e.g. pipes and struts) out
of the emission cone.
The illustrations of the emission cones are
simplified and represent only the main beam
- a number of weaker beams also exist. Un-
der difficult measuring conditions, the antenna location and alignment must be chosen
with the objective of reducing false echoes.
Only giving attention to the size of the useful
echo is not adequate when measuring conditions are unfavourable.
In a difficult measuring environment, searching for a mounting location with the lowest
possible false echo intensity will bring the
best results. In most cases, the useful echo
will then be present with sufficient strength.
With the adjustment software PACT
ware
TM
on
the PC, you can have a look at the echo image and optimise the mounting location.
If possible, provide a "clear view“ to the
product inside the emission cone and avoid
vessel installations in the first third of the
emission cone.
Optimum measuring conditions exist when
the emission cone reaches the measured
product perpendicularly and when the emission cone is free from obstructions.
Examples of vessel echoes
The following vessel images show a typical
echo pattern in a vessel. This is the example
of a process vessel with a slow doublebladed stirrer. In the lower par t, the vessel is
equipped with heating spirals. A thin, angled
inlet tube ends in the vessel centre between
the stirrer blades.
14 VEGAPULS 41 – Profibus PA
27292-EN-041227
Mounting and installation
Empty vessel ¼ filling
When the vessel is empty, you see the echoes of the vessel installations around the
emission cone. Beside the large bottom echo,
you see a number of additional false echoes.
The false echoes of the vessel installations
are saved during a false echo recording. For
this reason, the false echo recording must be
carried out when the vessel is empty.
False echoes from the top down:
- first inlet tube fastening
- upper stirrer blade
- second inlet tube fastening
- angled inlet tube
- upper heating tubes
- lower stirrer blade
- remaining heating tubes
- vessel bottom
After filling, the bottom echo is replaced by
the product echo.
½ filling
The product echo moves to the centre of the
meas. range. At the end of the meas. range,
you now see an echo at a position where the
bottom echo previously was in the empty
vessel. This echo is a multiple echo of the
product echo and is located at twice the
distance of the product echo.
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VEGAPULS 41 – Profibus PA 15
Mounting and installation
Filled vessel
In a completely filled vessel, you see additional multiple echoes at two, three or four
times the distance of the product surface
echo.
2.2 Measurement of liquids
Radar sensors are usually mounted on short
DIN socket pieces. The lower side of the
instrument flange is the reference plane for
the measuring range. - The socket piece
should be as short as possible, max. 70 mm.
When mounting on dished vessel tops, the
antenna length should correspond at least to
the length of the sockets.
In vessels with dished or rounded tops,
please do not mount the instrument in the
centre or close to the vessel wall.
Dished tank tops can act as paraboloidal
reflectors. If the radar sensor is placed in the
focal point of the parabolic tank, the radar
sensor receives amplified false echoes. The
radar sensor should be mounted outside the
focal point. Parabolically amplified echoes are
thereby avoided.
Antenna directly on the vessel top
If the stability of the vessel will allow it (sensor
weight), flat mounting directly on the vessel
top is a good and cost-effective solution. The
top side of the vessel is the reference plane.
Screwed antennas, especially when used on
small vessels, are mounted in sockets. The
antenna fits into even the smallest vessel
connection openings with 1½“ socket. The
socket must not be longer than 70 mm.
Reference plane
< 70 mm
Screwed antenna on 1½“ mounting boss
16 VEGAPULS 41 – Profibus PA
27292-EN-041227
Mounting and installation
2.3 Measurement in standpipe (surge or bypass tube)
General instructions
Pipe antennas are preferred in vessels which
contain many installations, e.g. heating tubes,
heat exchangers or fast-running stirrers.
Measurement is then possible where the
product surface is very turbulent, and vessel
installations can cause no false echoes.
Due to the concentration of the radar signals
within the measuring tube, even products
with small dielectric constants (ε
3) can be reliably measured in surge or by-
pass tubes.
Surge pipes which are open at the bottom
must extend over the full measuring range
(i.e. down to 0% level), as measurement is
only possible within the tube. The tube inner
diameter should be max. 100 mm or correspond to the size of the antenna horn.
Make sure the required upper vent hole in
the surge pipe is aligned with the sensor
type label.
As an alternative to a surge pipe in the vessel, a pipe antenna system outside the vessel in a bypass tube is also possible.
The surge and bypass tubes must generally
be made of metal. For plastic tubes, a
closed, conductive jacket is always required.
When using a metal tube with plastic inner
coating, make sure that the thickness of the
coating is minimal (approx. 2 … 4 mm).
Align the sensor so that the type label lies on
the same axis as the tube holes or the tube
connection openings. The polarisation of the
radar signals enables a considerably stabler
measurement with this alignment.
= 1.6 up to
r
When mounting a VEGAPULS 41 sensor on a
bypass tube (e.g. on a previous floating or
displacer unit), the radar sensor should be
placed approx. 300 mm or more from the
max. level.
For products with small dielectric constants
(< 4), a much longer bypass tube than would
otherwise be required by the lower tube
connection should be used. Products with
small dielectric constants are partly penetrated by the radar signals, allowing the
tube bottom to produce a stronger echo than
the product (when the bypass tube is nearly
empty). By extending the tube downward,
some liquid remains at the bottom even when
the vessel is completely empty.
Type label
> 300 mm
100 %
0 %
Tube flange system as bypass tube
300 ... 800 mm
If enough liquid (300 … 800 mm) remains in
the blind lower end of the tube, the portion of
the signal that penetrates the liquid and reflects from the tube bottom is sufficiently
damped - the sensor can then easily distinguish it from the echo of the liquid surface. A
deflection plate located at the bottom of a
vertical pipe has a similar function. It deflects
signals that reach the tube bottom into the
standard connection opening.
27292-EN-041227
VEGAPULS 41 – Profibus PA 17
Connections to the bypass tube
The connections to the bypass tubes must
be fashioned in such a way that only minimal
reflections are caused by the walls of the
connecting tubes. This is especially important
for the breather connection in the upper part
of the tube. Observe the following points:
• Use small openings for the connection.
• The diameter of the connecting tubes
should not exceed 1/3 of the bypass diameter.
• The tube connections must not protrude
into the bypass tube.
• Large welding beads in the tubes should
be avoided.
• Additional connections to the bypass tube
are more suitable if they lie on the same
plane as the upper and lower vessel connection (above each other or displaced by
180°).
Optimum connection to the bypass tube
Mounting and installation
Tube connection protrudes
Additional connection in the bypass tube in one plane
Use of guide tubes
In case of very rough inner surfaces in existing bypass tubes (e.g. due to corrosion),
large connecting tube openings as well as
bypass tubes with more than 100 mm inner
diameter, the use of a guide tube inside the
existing bypass tube is recommended. This
reduces the noise level and increases measurement reliability considerably. The flange of
the guide tube can be easily mounted as a
sandwich flange between vessel and sensor
flange.
Welding beads too large
18 VEGAPULS 41 – Profibus PA
27292-EN-041227
Mounting and installation
Seals on tube connections and tube extensions
Microwaves are very sensitive to gaps in
flange connections. If connections are made
without proper care, distinct false echoes as
well as increased signal noise can result.
Observe the following points:
• The applied seal should correspond to the
tube inner diameter.
• If possible, conductive seals such as conductive PTFE or graphite should be used.
• There should be as few seal positions as
possible in the guide tube.
Flange connections on bypass tubes
Adhesive products
In non-adhesive or slightly adhesive products, use a surge pipe with a nominal width of
e.g. 50 mm. VEGAPULS 41 radar sensors
with 26 GHz technology are for the most part
insensitive to buildup in the measuring tube.
However, buildup should not block the measuring tube.
Standpipe measurement of inhomogeneous products
ø 5...15
homogeneous
liquids
inhomogeneous liquids
Openings in a surge pipe for mixing of inhomogeneous products
If you want to measure inhomogeneous products or stratified products in a surge pipe, it
must have holes, elongated holes or slots.
These openings ensure that the liquid is
mixed and corresponds to the liquid in the
vessel.
The more inhomogeneous the measured
product, the closer the openings should be
spaced.
slightly inhomogeneous
liquids
ø 5...15
For products with somewhat heavier buildup,
the use of a DN 80 to max. DN 100 standpipe
or surge pipe can make the measurement
possible despite buildup. But with extremely
adhesive products, measurement in a stand-
Due to radar signal polarisation, the holes or
slots must be positioned in two rows offset
by 180°. The radar sensor must then be
mounted so that the type label of the sensor
is aligned with the rows of holes.
pipe is not possible at all.
Every wider slot causes a false echo. The
slots should therefore not exceed a width of
10 mm in order to keep the signal noise level
to a minimum. Round slot ends are better
than rectangular ones.
27292-EN-041227
VEGAPULS 41 – Profibus PA 19
Mounting and installation
Type label
ø 5...15
Row of holes in one axis with the type label
Surge pipe with ball valve
If a ball valve is mounted in the surge pipe,
maintenance and servicing can be carried
out without opening the vessel (e.g. if it contains liquid gas or toxic products).
Ball valve
> 300 mm
Vent hole
ø50
Deflector
Tube antenna system with ball valve cutoff in measuring tube
A prerequisite for trouble-free operation is a
ball valve throat that corresponds to the pipe
diameter and provides a flush surface with
the pipe inner wall. The valve must not have
any rough edges or constrictions in its channel. The distance to the sensor flange should
be min. 300 mm.
Guidelines for standpipe construction
The measuring pipe must be smooth inside
(average roughness Rz ≤ 30). Use stainless
steel tubing (drawn or welded lengthwise) for
construction of the measuring pipe. Extend
the measuring pipe to the required length
with welding neck flanges or with connecting
sleeves. Make sure that no shoulders or
projections are created during welding. Before welding, join pipe and flange with their
inner surfaces flush and exactly fitting.
Avoid welding through the pipe wall. The pipe
must remain smooth inside. Roughness or
welding beads on the inner surfaces must be
carefully removed and burnished, as they
cause false echoes and encourage product
adhesion.
If the vessel contains agitated products,
fasten the measuring pipe to the vessel bottom. Provide additional fastenings for longer
measuring pipes.
In products with lower dielectric values (< 4),
a part of the radar signal penetrates the
medium. If the vessel is nearly empty, echoes
are generated by both the product and the
vessel bottom. In some cases, the vessel
bottom generates a stronger echo than the
product surface. If a deflector is installed
below the open end of the measuring tube,
the radar signals are scattered and prevented from reaching the vessel bottom. This
ensures that, in nearly empty vessels or with
products of low dielectric value, the product
delivers a more distinct echo than the vessel
bottom.
Due to the deflector, the useful echo (and
thus the measured value) remains clearly
detectable in a nearly empty vessel, and the
0 % level can be reliably measured.
27292-EN-041227
20 VEGAPULS 41 – Profibus PA
0 %
Mounting and installation
The standpipe or surge pipe can be
equipped with a quadrant pipe at the end
instead of a deflector. The quadrant pipe
reflects the radar signals that penetrate the
medium diffusely to the side and reduces
strong echoes from the tube end or the vessel bottom.
Connecting
sleeve
Welding neck
flanges
Deburr the
holes
Deflector
0 %
100 %
150...500
~45û
2,9...6
5...10
2,9
ø 51,2
Welding of the connecting sleeves
0,0...0,4
Welding of the welding
neck flanges
1,5...2
0,0...0,4
Meas. pipe fastening
0 %
Quadrant pipe on the bypass tube end
Vessel
bottom
Quadrant pipe on the standpipe end
27292-EN-041227
VEGAPULS 41 – Profibus PA 21
Mounting and installation
2.4 False echoes
The radar sensor must be selected must be
installed at a location where no installations or
inflowing material cross the radar impulses.
The following examples and instructions
show the most frequent measuring problems
and how to avoid them.
Vessel protrusions
Vessel forms with flat protrusions can make
measurement very difficult due to their strong
false echoes. Baffles mounted above these
flat protrusions scatter the false echoes and
guarantee a reliable measurement.
Correct Incorrect
Vessel protrusions (ledge)
Intake pipes, i.e. for the mixing of materials with a flat surface directed towards the sensor - should be covered with a sloping shield
that will scatter false echoes.
Vessel installations
Vessel installations such as, e.g. ladders,
often cause false echoes. Make sure when
planning your measuring location that the
radar signals have free access to the measured product.
Correct Incorrect
Ladder
Vessel installations
Ladder
Struts
Struts, like other vessel installations, can
cause strong false echoes that are superimposed on the useful echoes. Small shields
effectively hinder a direct false echo reflection. These false echoes are scattered and
diffused in the area and are then filtered out
as "echo noise“ by the measuring electronics.
Correct Incorrect
Correct Incorrect
Shields
Struts
Vessel protrusions (intake pipe)
22 VEGAPULS 41 – Profibus PA
27292-EN-041227
Mounting and installation
Inflowing material
Do not mount the instrument in or above the
filling stream. Ensure that you detect the
product surface and not the inflowing material.
Correct
Inflowing material
Incorrect
Buildup
If the sensor is mounted too close to the
vessel wall, buildup and adhesions of the
measured product to the vessel wall cause
false echoes. Position the sensor at a sufficient distance from the vessel wall. Please
also note chapter "3.1 General installation
instructions“.
Correct
Incorrect
Strong product movements
Strong turbulence in the vessel, e.g. caused
by powerful stirrers or strong chemical reactions, can seriously interfere with the measurement. A surge or bypass tube (see
illustration) of sufficient size generally allows
reliable and problem-free measurement even
if strong turbulence occurs in the vessel,
provided there is no buildup of the product in
the tube.
Correct
Strong product movements
Incorrect
100 %
75 %
0 %
Buildup
27292-EN-041227
VEGAPULS 41 – Profibus PA 23
Mounting and installation
2.5 Common installation mistakes
Socket piece too long
If the sensor is mounted in a socket extension that is too long, strong false echoes
arise which interfere with the measurement.
Make sure that the horn antenna projects out
of the socket piece.
Correct
Reference plane
Flange antenna: Correct and unfavourable socket
length
Wrong orientation to the product
Weak measuring signals are caused if the
sensor is not directly pointed at the product
surface. Orient the sensor axis perpendicularly to the product surface to achieve optimum measuring results.
Unfavourable
Parabolic effects on dished or arched
vessel tops
Round or parabolic tank tops act like a parabolic mirror on the radar signals. If the radar
sensor is placed at the focal point of such a
parabolic tank top, the sensor receives amplified false echoes. The optimum mounting
location is generally in the range of half the
vessel radius from the centre.
Correct
Unfavourable
Unfavourable
Correct Incorrect
Ladder
Ladder
Mounting on a vessel with parabolic tank top
Sensor too close to the vessel wall
If the radar sensor is mounted too close to
the vessel wall, strong false echoes can be
caused. Buildup, rivets, screws or weld joints
superimpose their echoes onto the product
Direct sensor vertically to the product surface
24 VEGAPULS 41 – Profibus PA
i.e. useful echo. Please ensure a sufficient
distance from the sensor to the vessel wall.
27292-EN-041227
Mounting and installation
If there are good reflection conditions (liquid
medium, no installations), we recommend
locating the sensor where there is no vessel
wall within the inner emission cone. For products in less favourable reflection environments, it is a good idea to also keep the outer
emission cone free of interfering installations.
Note chapter "3.1 General installation instructions“.
Foam generation
Conductive foam is penetrated by radar
signals to different depths and generates a
number of individual (bubble) echoes. In
addition, the signals are damped in foam,
which is comparable to the damping of heat
radiation by Styrofoam. Thick, dense, creamy
and conductive foam can cause incorrect
measurements.
Conductive
foam
Liquid
Standpipe installation mistakes
Pipe antenna without ventilation hole
Pipe antenna systems must be provided with
a ventilation hole on the upper end of the
surge pipe. If this hole is absent, incorrect
measurements will result.
Correct
Pipe antenna: The surge pipe open to the bottom
must have a ventilation or equalisation hole on top
Wrong polarisation direction
When measuring in a surge pipe, especially if
there are holes or slots for mixing in the tube,
it is important that the radar sensor is aligned
with the rows of holes.
The two rows of holes (displaced by 180°) of
the measuring tube must be in the same
plane as the polarisation direction of the
radar signals. The polarisation direction is
always in the same plane as the type label.
Incorrect
Foam generation
Provide preventative measures against foam
Correct
Type label
Incorrect
or measure in a bypass tube. Check, if necessary, the possibility of using a different
measurement technology, e.g. capacitive
electrodes or hydrostatic pressure transmitters. In many cases, VEGAPULS 54 radar
sensors with 5.8 GHz operating frequency
achieve considerably better and more reliable measuring results in foam applications
than series 40 sensors with 26 GHz technology.
27292-EN-041227
VEGAPULS 41 – Profibus PA 25
VEGAPULS on the surge pipe: The sensor type plate
must be aligned with the rows of holes
3 Electrical connection
Electrical connection
3.1 Connection – Connection cable
– Screening
Safety information – Qualified personnel
Instruments which are not operated with
protective low voltage or DC voltage must
only be connected by qualified personnel.
This also applies to the configuration of
measuring systems planned for Ex environment.
As a rule, do all connecting work in the complete absence of line voltage. Always switch
off the power supply before you carry out
connecting work on the radar sensors. Protect yourself and the instruments.
Connection cables and bus configuration
Note the Profibus specification. The connection cables must be specified for the expected operating temperatures in your
systems and must have an outer diameter of
6 … 12 mm, to ensure the seal effect of the
cable entry on the sensor.
For power supply and bus communication, a
two-wire cable acc. to the Profibus specification (up to max. 2.5 mm
of conductor) is used. The electrical connection on the sensor is made by spring-loaded
terminals.
In a laboratory set-up, a Profibus system will
also work with standard, unshielded two-wire
cable. In practice, however, an automation
network and bus system can only be protected reliably against electromagnetic interference by using screened cable. Acc. to the
Profibus specification (IEC 1158-2),
screened and twisted cables are prescribed.
2
cross-section area
All participants are connected in one line
(serially). At the beginning and end points of
a segment, the bus is terminated by an active bus termination. On the DP bus level,
most participants already have a bus termination implemented. With more than 32 participants on the DP level, a so-called repeater
must be used to open and combine another
DP level with a max. of 32 additional participants. On the PA bus branch of the segment
coupler, the PA radar sensors also work with
a max. of 32 participants (Ex max. 10 participants).
A PA sensor can work only in conjunction with
a Profibus DP system, to which a Profibus PA
subsystem is connected. A PA Profibus participant must consume at least 10 mA of supply current.
Connection cable and cable length
Connection cables must correspond to the
Profibus specification and the FISCO model.
The sensor cable must be in conformity with
the values of the reference cable acc. to
IEC 61158-2:
2
0.8 mm
; R
= 44 Ω/km;
Z
31.25kHz
C
asymmetric
The max. cable length first of all depends on
the transmission speed:
up to 32 kbit/s: 1900 m Prup to 32 kbit/s: 1900 m Pr
up to 32 kbit/s: 1900 m Pr
up to 32 kbit/s: 1900 m Prup to 32 kbit/s: 1900 m Pr
up to 94 kbit/s: 1200 m Profibus DP
up to 188 kbit/s: 1000 m Profibus DP
up to 500 kbit/s: 500 m Profibus DP
up to 1500 kbit/s: 200 m Profibus DP
up to 12000 kbit/s: 100 m Profibus DP
DCmax.
= 80 … 120 Ω; damping = 3 dB/km;
= 2 nF/km.
ofibus Pofibus P
ofibus P
ofibus Pofibus P
AA
A
AA
27292-EN-041227
26 VEGAPULS 41 – Profibus PA
Electrical connection
The distributed resistance of the cable, in
conjunction with the output voltage of the
segment coupler and the current requirement
(VEGAPULS 10 mA) or the voltage requirement (VEGAPULS 9 V) of the sensors, determines the max. cable length.
In a practical application of a PA bus branch,
the max. length of the cable is also determined (beside the required supply voltage
and max. current consumption of all participants on the PA bus branch) by the structure
and the type of segment coupler used.
The cable length results from the sum of all
cable sections and the length of all stubs.
The length of the individual stubs must not
exceed the following lengths:
1 … 12 stubs 120 m (Ex: 30 m)
13 … 18 stubs 60 m (Ex: 30 m)
19 … 24 stubs 30 m (Ex: 30 m)
More than 24 stubs are not permitted,
whereby each branch longer than 1.2 m is
counted as a stub. The total length of the
cable must not exceed 1900 m (in Ex version
1000 m).
Ground terminal
The electronics housings of the sensors have
a protective insulation. The ground terminal in
the electronics housing is galvanically connected with the metallic process connection.
For sensors with a plastic thread as process
fitting, the sensor must be grounded through
a ground connection to the exterior ground
terminal.
Screening
„Electromagnetic pollution“ caused by electronic actuators, energy cables and transmitting systems has become so pervasive that
shielding for normal two-wire bus cable is
usually a necessity. According to the Profibus
specification, the screening should be
grounded on both ends. To avoid potential
equalisation currents, a potential equalisation
system must be provided in addition to the
screening.
According to the specification, we recommend the use of twisted and screened twowire cable, e.g.: SINEC 6XV1 830-5AH10
(Siemens), SINEC L26XV1 830-35H10 (Siemens), 3079A (Belden).
Alternatively, when grounding at both ends in
non-Ex areas, the cable shielding can be
connected on one ground side (in the switching cabinet) via an Y capacitor
1)
to ground
potential. Make sure that the ground connection has the lowest possible resistance (foundation, plate or mains earth).
Profibus PA in Ex environment
When used in Ex area, the PA bus (including
all connected instruments) must be
configured as intrinsically safe protection
class „i“. Four-wire instruments requiring
separate supply must at least have an intrinsically safe PA connection. VEGA sensors for
PA Ex environment are generally „ia two-wire
instruments“.
1)
max. 10 nF, e.g. voltage resistance 1500 V,
27292-EN-041227
VEGAPULS 41 – Profibus PA 27
ceramic
Electrical connection
In the so-called Fieldbus Intrinsically Safe
Concept (FISCO), the boundary conditions
for an Ex safe bus configuration have been
laid down. Therein the participants and the
bus cables with their electrical data have
been determined, ensuring that the linking of
these components always meets Ex requirements. A more time-consuming Ex calculation
is therefore not necessary. You can build
your Ex bus according to the IEC standard
1158-2.
The Ex segment coupler delivers a controlled
power supply to the PA bus. It acts as
source in the PA branch. All other components (field instruments and bus terminators)
are only consumers. A field instrument must
consume at least 10 mA. Ideally, an individual
sensor should not consume more than 10
mA, so that the number of instruments can be
as large as possible.
VEGA PA sensors, whether Ex or non-Ex,
consume a constant current of 10 mA. According to the Profibus specification, this is
the minimum participant current. With VEGA
sensors, it is therefore possible to connect 10
sensors (also in Ex environment) even with a
limited energy supply from the Ex segment
couplers.
Watch out for potential losses
Due to potential losses, grounding on both
ends without a potential equalisation system
is not allowed in Ex applications. If an instrument is used in hazardous areas, the required regulations, conformity and type
approval certificates for systems in Ex areas
must be noted (e.g. DIN 0165). Please also
note the approval documents (as well as the
enclosed safety data sheet) that come with
each Ex sensor.
Electrical data of the cables
R
DC
No. of A in Z
cores mm
2
31.25kHz
C in Damping Screen
nF/km
SINEC 6XV1 44 Ω/km 2 0.75 100 Ω < 90 < 3 dB/km Cu braiding
830-5AH10 +/- 20 Ω 39 kHz
(Siemens)
SINEC L26XV1 44 Ω/km 2 0.75 100 Ω < 90 < 3 dB/km Cu braiding
830-35H10 +/- 20 Ω 39 kHz
(Siemens)
3079A 105 Ω/km 2 0.32 150 Ω 29.5 < 3 dB/km Foil
(Belden) 39 kHz
28 VEGAPULS 41 – Profibus PA
27292-EN-041227
Electrical connection
3.2 Sensor address
In a Profibus system composed of Profibus
DP and Profibus PA subsystem, each participant must have a unique address. Each
participant, whether master or slave, is
accessed by means of its own address in
the bus system. The address of a participant, whether on DP or PA level, should be
assigned before connecting to the bus, because an address can be used only once. If
an address is used twice, bus interference
will result.
The address of a radar sensor can be set in
two ways:
- with the adjustment software VVO
(software addressing) or
- with the DIP switch block in the sensor
(hardware addressing).
VEGA Profibus sensors are delivered with
the address set at 126 (all DIP switches to
„ON“).
Remember, in a Profibus system there are
max. 126 participants possible. When the
DIP switch is set to address 126 (or higher),
the address can be adjusted with the adjustment software VVO, the adjustment module
MINICOM or another configuration tool (e.g.
PDM). However, there can be only one sensor on the bus with address 126 (delivery
status) during address assignment via software. For that reason, hardware addressing
(DIP switch) before connection to the bus is
recommended.
Hardware addressing
The DIP switches generate an address
number in the binary system. This means
that, from right to left (ascending), any switch
represents a number twice as high as the
previous switch on the right. The corresponding number in the decimal system
results from the sum of all switches set to
„ON“. In the illustration you see the decimal
number that corresponds to each individual
DIP switch.
DIP switch 8 corresponds to the number 128,
switch 1 corresponds to the number 1 and
switch 3 corresponds to the decimal number
4.
1
2
8765 4
128
64
32
Example 1
The switches 3, 5 and 7 are set to „ON“. The
address is then:
DIP switch 3 to „ON“ means 4
DIP switch 5 to „ON“ means 16
DIP switch 7 to „ON“ means 64
The sum is:
4 + 16 + 64 = Address 84
3
1
2
4
8
16
ON
1
2
8765 4
64
64 + 16 + 4 = 84
27292-EN-041227
VEGAPULS 41 – Profibus PA 29
3
16
4
Electrical connection
Example 2
You want to set address 27.
16 + 8 + 2 + 1 = 27
You must set the DIP switches
5 = 16
4 = 8
2 = 2
1 = 1
to „ON“.
Example 3
You want to set address 99
64 + 32 + 2 + 1 = 99
You must set the DIP switches
7 = 64
6 = 32
2 = 2
1 = 1
to „ON.
Software addressing
The DIP switches must be set to an address
of 126 … 255, i.e.
- either all DIP switches are set to „ON“,
corresponding to address 255 (delivery
status)
OFF
1
2
64
3
ON
8765 4
32
16
1
2
3
1
2
4
8
8765 4
Addr.
- or only DIP switch 8 is set to „ON“, corresponding to address 128.
128
Of course, software addressing is also possible if the switches 7 … 2 are set to „ON“
(address 126).
The adjustment of the address with software
VVO is described in chapter „5.2 Adjustment
with VVO“ under the heading „Software addressing“ or in chapter „5.3 Sensor adjustment with the adjustment module MINICOM“.
30 VEGAPULS 41 – Profibus PA
27292-EN-041227
Electrical connection
ESC
OK
3.3 Connecting the sensor
After mounting the sensor at the measurement location according to the instructions in
chapter "3 Mounting and installation“, loosen
the closing screw on top of the sensor. The
sensor lid with the optional indication display
can then be opened. Unscrew the sleeve nut
and slip it over the connection cable (after
removing about 10 cm of insulation). The
sleeve nut of the cable entry has a self-locking ratchet that prevents it from opening on
its own.
Version with aluminium housing
Power supply and
Profibus signal
+
To the indicating instrument in the
sensor lid or to the external
indicating instrument VEGADIS 50
–
M20 x 1.5
(diameter of the
connection cable
6…9 mm)
Now insert the cable through the cable entry
into the sensor. Screw the sleeve nut back
onto the cable entry and clamp the stripped
wires of the cable into the proper terminal
positions.
The terminals hold the wire without a screw.
Press the white opening levers with a small
screwdriver and insert the copper core of the
connection cable into the terminal opening.
Check the hold of the individual wires in the
terminals by lightly pulling on them.
Version with plastic housing
To the display in the lid or
the external indicating
instrument
Power supply and
Profibus signal
+-
M20 x 1.5
(diameter of the
connection cable
6…9 mm)
1
2
3
8 7654
+1 2- 5 6 7 8
Addr.
Bus
Display
ON
Spring-loaded terminals
(max. 2.5 mm
cross-section)
2
wire
+1 2- 5678
Addr.
Bus
Display
ON
1
2
3
87654
Opening tabs
ESC
-
+
OK
Pluggable
adjustment
module
MINICOM
Tank 1
m (d)
12.345
ESC
+
-
OK
27292-EN-041227
VEGAPULS 41 – Profibus PA 31
3.4 Connecting the external indicating instrument
Loosen the four screws of the housing lid on
VEGADIS 50.
The connection procedure can be facilitated
by fixing the housing cover during connection work with one or two screws on the right
of the housing.
OUTPUT
(to the sensor)
3
2
1
4
5
8
6
7
Adjustment
module
VEGADIS 50
Tank 1
m (d)
12.345
Electrical connection
ESC
+
-
OK
Power supply and
digital meas. signal
-
+
8 7654
+1 2- 5 6 7 8
Addr.
Bus
Tank 1
m (d)
12.345
DISPLAY
(in the lid of the
indicating
instrument)
1
2
3
Display
ON
ESC
+
-
OK
Screws
32 VEGAPULS 41 – Profibus PA
27292-EN-041227
Types and versions
3.5 Bus configuration
The type of radar sensor you use depends
on your process requirements and mounting
conditions, as well as on the requirements of
your control, regulative, or process management system.
VEGAPULS 42, 44 and 45 Profibus radar
sensors are sensors for use in Profibus PA
environment. Profile 3 has been implemented
in the sensors. A measuring system consists
of one or several sensors, one or several
segment couplers and one DP master computer, such as e.g. an S7 PLC with Profibus
interface or a process management system
with Profibus DP-Master-Slot. The processing
unit (e.g. the PLC) evaluates the level-proportional, digital measuring signals in a number
of evaluation routines and puts them to use
process-specifically.
On the following four pages you will see
schematic illustrations of the bus configuration.
The automation system as Master-Class 1
takes over bus control completely. It reads
out all signals cyclically and, if necessary,
gives instructions to the participants (e.g.
sensors). Beside this, additional master systems (e.g. visualisation systems or adjustment tools) can be connected to the DP bus.
These systems operate as so-called MasterClass 2 participants. Like the Master-Class 1
system, they can read out signals, give instructions and operate in the acyclical mode.
A DP bus does not allow power supply via
signal cable, whereas the PA bus does. Both,
DP and PA, require at a minimum a screened
two-wire cable. The DP bus can additionally
have up to 8 cores (screened), of which
some can be supply cables (see also „Installation Guides PA + DP“ of the Profibus User
Organisation (PNO).
Each participant on the bus mast have a
unique address. The addressing covers
both bus levels. A Profibus DP network can
have max. 126 participants on the PA level. In
practice, each Master-Class 1 computer gets
address 1 and the Master-Class 2 computer
address 10 … 20. As a rule, the slaves or
participants get the addresses 21 … 126. On
the Profibus PA network segment, max. 32
sensors can be connected on one PA segment coupler.
Ex environment
In Ex environment, intrinsically safe (EEx ia)
PA sensors are used with Ex segment couplers. Generally, the number of PA sensors
on a segment coupler (Ex or non-Ex) depends on the current requirement of the
sensors and on the current supplied by the
segment coupler. Segment couplers for
EEx ia environment provide 90 … 110 mA.
The number of sensors results from the sum
of:
- the basic current intake of all sensors
- plus 9 mA communication signal
- plus the leakage currents of all sensors
- plus a recommended current reserve
(approx. 10 mA)
The min. basic current has been set at 10 mA
according to the Profibus specification.
VEGA Profibus radar sensors constantly
consume a basic current of 10 mA and operate without leakage current requirements, so
that in Ex environment, up to max. ten VEGA
sensors can be operated on one segment
coupler.
27292-EN-041227
VEGAPULS 41 – Profibus PA 33
Profibus PA sensors on Profibus network
1
Types and versions
Master-Class 1
Bus terminator
3...9
Profibus PA (31,25 kBit/s)
Profibus DP
21
Profibus interface
card
RS 232
22...54
3
RS 485
10
Master-Class 2
Segment coupler
Bus terminator
2
22
23
24
53
54
VEGACONNECT 3
PA segment on segment coupler:
1 … 32 sensors on one two-wire cable
(Ex: 10 sensors)
34 VEGAPULS 41 – Profibus PA
27292-EN-041227
Types and versions
Profibus DP segment level
1 … 126 participants including all DP and PA participants.
Due to segment couplers and PA segments in the complete system on PA and DP level, the transmission rate is
determined by the slowest coupler/participant.
Bus terminator
3...9
55
M
Segment coupler
56...88
Bus terminator
2
Profibus PA
3~M
3...9
89
90
Bus terminator
2
56
57
87
88
PA segment:
1 … 32 sensors on one two-wire cable
(Ex: 10 sensors)
27292-EN-041227
VEGAPULS 41 – Profibus PA 35
Profibus PA sensors with 4 … 20 mA sensors on Profibus network
1
Types and versions
Master-Class 1
Bus terminator
VEGALOG
Profibus PA (31,25 kBit)
3~M
3…9
Profibus DP
Profibus interface
card
21
3
RS 485
22
10
Master-Class 2
VEGACONNECT 3
4
RS 232
1
2
3
5
11
12
4
1 … 15 PA sensors per two-wire cable
13
15
14
with independent address zone (Ex: 10 sensors)
36 VEGAPULS 41 – Profibus PA
27292-EN-041227
Types and versions
Profibus DP segment level
1 … 126 participants including all DP and PA participants.
Up to 12 MBit/s transmission rate on DP level.
In the PA segments, 31.25 kBit/s transmission rate.
VEGACONNECT 3
4 … 20 mA (HART )
2
4
4
4
2
2
2
Profibus PA (31,25 kBit)
3…9
23
M
3…9
24
25
VEGALOG
VBUS
Outputs
2
2
2
2
®
2
2
2
2
2
0/4…20 mA
0…10 V
2
VBUS
Bus terminator
Profibus PA:
1 … 15 sensors per two-wire cable
(Ex: 10 sensors) with independent address zone
VBUS:
1 … 15 sensors per twowire cable
Exd: also 15
Ex ia: 5 sensors
27292-EN-041227
VEGAPULS 41 – Profibus PA 37
Set-up
4 Set-up
4.1 Adjustment media
In chapter „1.4 Adjustment“ the Profibus
adjustment structure was briefly explained
and the adjustment media for VEGA Profibus
sensors were shown. All VEGA Profibus
sensors operate in profile 3 and can be adjusted with:
- the adjustment software PACT
- the Siemens software PDM in conjunction
with an EDD (Electronic-Device-Description)
- the adjustment module MINICOM in the
sensor.
Adjustment with the PC
The adjustment software PACT
user-friendly adjustment of VEGA Profibus PA
sensors. All functions and options of sensor
adjustment are accessible. The program
runs under Windows
Profibus-Master-Class 2 interface card on
Profibus DP level as Master-Class 2 tool. The
adjustment software accesses the VEGA PA
sensors via the DP bus, the segment coupler
and the PA bus.
®
on a PC with a
ware
ware
TM
TM
enables
4.2 Adjusting the sensor with the adjustment module MINICOM
Tank 1
m (d)
12.345
Beside the PC, you can use the small, detachable adjustment module MINICOM to
carry out the adjustments directly in the sensor.
With the adjustment module MINICOM, only
the sensor-relevant adjustments such as e.g.
scaling of the sensor display, operating
range, meas. conditions, sensor display
scaling or false echo storage are possible.
Not possible, however, are all adjustment
steps relating to configuration, conditioning
and signal processing (configuration of the
inputs and outputs, linearisation curves,
simulation …). This is only possible with the
PC.
The adjustment module MINICOM is operated with 6 keys. A small display shows you
apart from the measured value, a short message on the menu item or the value entered in
a menu.
ESC
+
-
OK
Adjustment with PDM
The sensors can be adjusted completely with
PDM. However, some convenient functions
and many special features, like e.g. display
of an echo curve, are not available. In addition to the PDM software, an EDD (available
on request from VEGA) is required for each
sensor type. The adjustment instructions for
however, cannot be compared with that of the
adjustment program VVO. Nevertheless with
the help of the menu schematic for MINICOM
you will be able to quickly find your way
through the adjustment structure. In time, you
might even be able to carry out your adjustments with the small module faster and more
efficiently than with the PC.
PDM are described in the PDM documenta-
The volume of information of the small display,
tion.
Error codes:
E013 No valid measured value
- Sensor in the warm-up phase
Adjustment with the adjustment module
MINICOM
With the adjustment module MINICOM, you
adjust the individual sensor directly in the
sensor or in the external indicating instrument
VEGADIS 50. The adjustment module
MINICOM enables (with the 6-key adjustment
field with text display) all essential functions
of parameter setting and adjustment.
38 VEGAPULS 41 – Profibus PA
- Loss of the useful echo
E017 Adjustment span too small
E036 Sensor program not operating
- Sensor must be reprogrammed
(service)
- Failure message also appears
during programming
E040 Hardware failure, electronics
defective
27292-EN-041227
Set-up
Adjustment steps
On the following pages you will find the complete menu schematic of the adjustment module MINICOM. Set up the sensor in the
numbered sequence:
1.Address
2. Measuring tube adjustments (only for
measurement in a standpipe)
3. Operating range
4. Adjustment
5. Conditioning
6. Meas. conditions
7. False echo storage (only required when
errors occur during operation)
8. Indication of the useful and noise level
9.Outputs
Outputs
Short explanations to the setup steps 1 … 9
follow.
1. Address
Choose a free bus address with the DIP
switch (see chapter „3.2 Sensor address“).
2. Measurement in a standpipe
Adjustment is only necessary if the sensor is
mounted in a standpipe (surge or bypass
tube). When measuring in a standpipe, do a
sounding of the distance and correct the
measured value display (which can differ
several percent from the sounded value)
according to the sounding. From then on, the
sensor corrects the running time shift of the
radar signal and displays the correct value of
the level in the standpipe (measuring tube).
3. Operating range
Without special adjustment, the operating
range corresponds to the measuring range.
It is generally advantageous to set the operating range slightly larger (approx. 5 %) than
for measuring range.
Example:
Min./max. adjustment: 1.270 … 5.850 m;
adjust operating range to approx.
1.000 … 6.000 m.
4. Adjustment
Max.
Min.
Under the menu item "
the sensor of the measuring range it should
operate in.
You can carry out the adjustment with or
without medium. Generally, you will carry out
the adjustment without medium, as you can
then adjust without a filling/emptying cycle.
Adjustment without medium
(adjustment independent of the level)
Key Display indication
OK
OK
OK
OK
100 % (1.270 m) correspond
to 1200 liters
Span (4.58 m)
0 % (5.850 m) corresponds
to 45 liters
Adjustment
Sensor
m(d)
4.700
Parameter
Adjustment
w.o
medium
Adjustment
in
m(d)
(min. adjustment)
“ you inform
27292-EN-041227
VEGAPULS 41 – Profibus PA 39
Set-up
+
The distance indication flashes
and you can choose "feet“ and
"m“.
OK
+ –
or
Confirm the adjustment with
"
OK
“.
Adjustment
in
With "
+
“ and "–“ you adjust the
m(d)
0.0%
at
m (d)
XX.XXX
percentage value for the min.
value (example 0.0 %).
The entered percentage value
is written in the sensor and the
OK
min. distance value corresponding to that percentage
value flashes.
+ –
or
With the "
assign a level distance (ex-
+
“ or "–“ key you can
ample 5.85 m) to the previously adjusted percentage
value. If you do not know the
distance, you have to do a
sounding.
OK
The adjusted product distance is written in the sensor
and the display stops flashing.
You thereby adjusted the lower product distance as well as the percentage filling value
corresponding to the lower product distance.
Note:
For level detection outside the operating range,
the operating range must be corrected accordingly in the menu "
ing range“
.
Sensor optimisation/Operat-
100.0%
at
m (d)
XX.XXX
(max. adjustment)
Now you make the max. adjustment (upper
product distance) (example: 100 % and
1.270 m product distance). First, enter the
percentage value and then the product distance corresponding to that percentage value.
Note:
The difference between the adjustment values of the lower product distance and the
upper product distance should be as large
as possible, preferably at 0 % and 100 %. If
the values are very close together, e.g. lower
product distance at 40 % (3.102 m) and
upper product distance at 45 % (3.331 m),
the measurement will be less accurate. A
characteristic curve is generated from the
two points. Even the smallest deviations
between actual product distance and entered product distance will considerably
influence the slope of the characteristic
curve. If the adjustment points are too close
together, small errors inflate to considerably
larger ones when the 0 % or the 100 % value
is outputted.
Adjustment with medium
with
medium
XXX.X
Max.
adjust
at %
XXX.X
Min.
adjust
at %
Fill the vessel e.g. to 10 % and enter 10 % in
the menu "
Min. adjust
“ with the "+“ and "–“
keys. Then fill the vessel, e.g. to 80 % or
100 % and enter 80 % or 100 % in the menu
"
Max. adjust
“ with the "+“ and "–“ keys.
5. Conditioning
Signal
condit
ioning
Scal
ing
0 %
100 %
Deci-
prop.
corres
corres
ponds
XXXX
mal
point
888.8
Conditioning
ponds
XXXX
Under the menu item "
assign a product distance at 0 % and at 100
% filling. Then, you enter the parameter and
the physical unit as well as the decimal point.
Enter in the menu window "
0 % corresponds
Unit
to
Mass
Kg
“, you
27292-EN-041227
“
40 VEGAPULS 41 – Profibus PA
Set-up
the numerical value of the 0 % filling. In the
example of the adjustment with the PC and
the adjustment software VVO, this would be
45 for 45 liters.
• Confirm with "
OK
“.
With the "—>“ key you switch to the 100 %
menu. Enter here the numerical value of your
parameter corresponding to a 100 % filling.
In the example 1200 for 1200 liters.
• Confirm with "
OK
“.
If necessary, choose a decimal point. However, note that only max. 4 digits can be
displayed. In the menu "
prop. to
“ you choose
the physical quantity (mass, volume, distance…) and in the menu "
Unit
“ the physical
unit (kg, l, ft3, gal, m3 …).
Linearisation:
A linear correlation between the percentage
Adjust
ment
Signal
condit
ioning
Scal
ing
Lin.
curve
Linear
Integra
tion
time
0 s
to record the false echoes and save them in
an internal database. The sensor electronics
treats these (false) echoes differently from
the useful echoes and filters them out.
8. Useful level, noise level
In the menu
Ampl.:
XX dB
S-N:
XX
you get important information on the signal
quality of the product echo. The greater the
"S-N“ value, the more reliable the measurement (menu plan MINICOM).
Ampl.: means amplitude of the level echo in
S-N: means Signal-Noise, i.e. the useful
The greater the "S-N“ value (difference between the amplitudes of the useful signal level
and the noise level), the better the measurement:
> 50 dB Measurement excellent
40 … 50 dB Measurement very good
20 … 40 dB Measurement good
10 … 20 dB Measurement satisfactory
5 … 10 dB Measurement sufficient
< 5 dB Measurement poor
dB
dB (useful level)
level minus the level of the background noise
value of the product distance and percentage value of the filling volume has been preset. With the menu "Lin. curve“ you can
choose between linear, spherical tank and
cylindrical tank. The generation of a custom-
Example:
Ampl. = 68 dB
S-N = 53 dB
68 dB – 53 dB = 15 dB
ized linearisation curve is only possible with
the PC and the adjustment program VVO.
This means that the noise level is only
68 dB – 53 dB = 15 dB.
6. Meas. conditions
(see menu schematic)
7. False echo storage
A false echo storage is always useful when
unavoidable false echo sources (e.g. struts)
must be minimised. By creating a false echo
memory, you authorise the sensor electronics
27292-EN-041227
VEGAPULS 41 – Profibus PA 41
A 15 dB noise level and a 53 dB signal difference yield a high degree of measurement
reliability.
9. Outputs
Under the menu "Outputs“ you determine, for
example, whether the current output should
be inverted, or which unit of measurement
should be shown on the sensor display.
Menu schematic for the adjustment module MINICOM
Sensor
m(d)
4.700
Parameter
Sensor
optimize
Meas.
enviro
nment
PULS 42
After switching on, the sensor
P
type and the software version are
3.00
displayed for a few seconds.
Configuration
Sensor
Tag
Verdam
pfer
1.
Sensor
addr.
(•–/ –•)
126
Set-up
Sensor address:
• Sensor address here from 1 … 126 only
adjustable, if the DIP switch in the sensor is
set to address greater than/equal to 126.
• For adjustment of the sensor with the DIP
switch to address 128, switch 8 must be set
to „ON“.
Meas.
unit
m (d)
3.
Operating
range
Begin
4. 5.
Adjust
ment
w.out
medium
m (d)
0.50
End
m (d)
6.00
6. 2.
Meas.
condit
ions
Condit
ion
solid
Condit
ion
liquid
Fast
change
No
Fast
change
No
with
medium
High
dust
level
No
Agitat
ed sur
face
No
Foaming
prod.
No
Large
angle
repose
No
Multi
ple
echo
No
Low DK
product
No
Signal
condit
ioning
Scaling
Measure in
tube
No
Lin.
curve
Linear
Multi
ple
echo
No
Integr
ation
time
Tube
diamet
0 s
Correc
tion
Now!
Measur
ing in
tube
mm (d)
OK?
Correc
tion
factor
2.50 %
50
Correc
tion
Now!
OK ?
0.0 %
at
m (d)
XX.XXX
100.0%
at
m (d)
XX.XXX
Minadjust
at %
XXX.X
Maxadjust
at %
XXX.X
0 %
corres
ponds
XXXX
100 %
corres
ponds
XXXX
Decimal
point
888.8
Prop.
to
Mass
Unit
Kg
Adjust
ment
in
m(d)
42 VEGAPULS 41 – Profibus PA
27292-EN-041227
Set-up
With these keys you move in
the menu field to the left, right,
top and bottom
ESC
7. 8.
9.
act.
dist.
m (d)
4.700
Update
Meas.
dist.
m (d)
X.XX
Update
Now!
Learning!
OK?
False
echo
memory
Create
new
Meas.
dist.
m (d)
X.XX
Create
new
OK?
Learning!
Outputs
Add’l
functions
Info
Ampl.:
XX dB
S-N:
XX
dB
Delete
Delete
Now!
OK?
Deleting!
Simulation:Simulation:
Simulation:
Simulation:Simulation:
Sensor
Tag
Sensor
One hour after the last simulation
adjustment, the sensor returns
automatically to normal operating
mode.
Simulation
Sensor
type
PULS42
P
Reset
to de
fault
Reset
Now!
OK?
Reset
ing!
Serial
no.
1094
0213
Act.
dist.
m
X,XX
Language
English
Softw.
Softw.
vers.
date
3.00
15.09.
1999
Act.
max.
dist.
range
m (d)
m (d)
4.700
7.000
Menu items in bolt print provide
sensor and measured value
information and cannot be
modified in this position.
OK
Sensor
addr.
(•–/ –•)
Ampl.:
XX dB
S-N:
XX
126
dB
PA
output
Fail-
Prop.
ure
to
mode
di-
Value
stance
27292-EN-041227
Sensor
displ.
Prop.
to
distance
Simulation
Now!
Simulation
XXX.X
OK ?
High
dust
level
No
%
Fast
change
Ye s
Light grey menu fields are only
displayed if required (dependent
on the adjustments in other
menus).
White menu items can be
modified with the "+“ or "–“ key
and saved with the "OK“ key .
VEGAPULS 41 – Profibus PA 43
6 Diagnostics
Diagnostics
6.1 Simulation
To simulate a certain filling, you can call up
the function „Simulation“ on the adjustment
module MINICOM or in the adjustment software PACT
With this function, you simulate a real vessel
filling. Please note that connected instru-
ware
TM
.
Simulation with PACT
If you start the simulation mode with
PAC T
TM
ware
on the PC, the simulated level is
outputted until you quit the simulation mode.
Simulation with MINICOM
If you start the simulation mode on the adjustment module MINICOM, the sensor returns to
standard operating mode after one hour.
ware
TM
ments, such as e.g. a PLC, react acc. to their
adjustments and will probably activate
alarms or system functions.
6.2 Error codes
Error codes Fault rectification
E013 No valid measured value Message is displayed during the warm-up
- Sensor in the warm-up phase phase.
- Loss of the useful echo If the message remains, a false echo storage
(with the adjustment software on the PC - see
„Echo curve“ under „Sensor optimisation“) must
be carried out together with a modification of
mounting location and orientation to achieve the
lowest possible false echo background.
E017 Adjustment span too small Carry out a readjustment.
Make sure that the difference between
min. and max. adjustment is at least 10 mm.
E036 Sensor software does not run Sensor requires a software update (service).
Message appears during a software update.
E040 Hardware failure/Electronics defec- Check all connection cables.
tive Contact our service department.
E113 Communication conflict Service or sensor exchange
44 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
7 Technical data
7.1 Technical data
Power supply
Supply voltage 9 … 32 V DC
Supply voltage dependent on
output voltage U
segment coupler (see PA
specification) e.g.
- non-Ex 22 V DC (max. 32 sensors on one
- E x 15 V DC (max. 10 sensors on one
Current consumption constantly 10 mA (no leakage current output)
Resistance of the signal cable dependent on segment coupler, see
Unit and measuring range
Unit distance between product surface and
Measuring range 0 … 10 m
Output signal
Signal output digital output signal in two-wire technology
Resistance/Load of the signal cable dependent on the segment coupler (see
Integration time (adjustable) 0 … 999 seconds
of the
O
two-wire cable)
two-wire cable)
technical data of the segment coupler and
Profibus specification
process fitting (e.g. lower flange side of the
sensor)
(PA): The digital output signal (meas. signal)
is superimposed on the power supply and
further processed in the PLC or processing
system, max. 32 sensors on one two-wire cable
(Ex: max. 10)
technical data of the segment coupler) and
the existing bus cable (see Profibuscable parameters)
Two-wire technology:
The digital output signal (meas. signal) is superimposed on the power supply and further
processed in the signal conditioning instrument or in the processing system. Up to 15
sensors can be operated on one two-wire cable (in Ex area up to 5 sensors).
Four-wire technology:
Separate power supply. The digital output signal (meas. signal) is transmitted in a cable
separate from the power supply.
27292-EN-041227
VEGAPULS 41 – Profibus PA 45
Technical data
Measured value display (optional)
Liquid crystal display
- in the sensor scalable measured value output as a graph and
as a number
- external, powered by the sensor scalable measured value output as a graph and
as a number. Measured value display can be
mounted up to 25 m away from the sensor (max.
cable length 25 m).
Adjustment
- PC and adjustment software VEGA Visual Operating
- adjustment module MINICOM
- SIMATIC-PDM
-PACTware
Accuracy
TM
1)
(typical values under reference conditions, all statements relate to the nominal range)
Characteristics linear
Accuracy see diagram
10 mm
5 mm
-5 mm
0,5 m 10 m
-10 mm
Resolution in general max. 1 mm
Resolution of the output signal 1 mm or 0.005 %
Ambient conditions
Ambient temperature on the housing -40°C … +80°C
Process temperature (flange temp.) -40°C … +130°C
Storage and transport temperature -60°C … +80°C
Vessel pressure -1 … 3 bar (-100 … 300 kPa)
Protection IP 66 and IP 67
Protection class
- two-wire sensor II
- four-wire sensor I
Overvoltage category III
46 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
Characteristics
1)
(typical values under reference conditions, all statements relate to the nominal measuring
range)
Min. span between
full and empty > 10 mm (recommended > 50 mm)
Frequency 26 GHz
Intervals
- two-wire sensor 0.6 s
- four-wire sensor 0.5 s
Beam angle (at -3 dB) 22°
Adjustment time (response time)
2)
> 1 s (depending on parameter setting)
Influence of the process temperature at 0 bar not measurable;
at 5 bar 0.004 %/10 °K;
at 40 bar 0.03 %/10 °K
Influence of the process pressure 0.0265 %/bar
Emitted radar power (average) 0.717 µW
Received average emitted power
3)
- distance 1 m 0.4 … 3.2 nW per cm² (0.4 … 3.2 x 10-9W/cm²)
- distance 5 m 0.02 … 0.13 nW per cm²
Ex technical data
Comprehensive data in separate approval documents
Connection cables
Two-wire sensors power supply and signal via one two-wire
cable
Four-wire sensor power supply and signal separate
Electrical connection
- cable entry for Aluminium and plastic housing:
one cable entry (four-wire: two cable entries)
and spring-loaded terminal connection
up to max. 2.5 mm
2
wire cross-section
- plug connection optional for plastic housing:
four-pole, polarity reversal-proof screw
connection (four-wire: two plug connections)
Cable entry
- ia terminal compartment 1 … 2 x M20 x 1.5 (cable-ø 5 … 9 mm) or
1 … 2 x ½“ NPT EEx d (cable-ø 3.1 … 8.7 mm
or 0.12 … 0.34 inch)
- Exd terminal compartment
(pressure-tight encapsulated) 1 x½“ NPT EEx d (cable-ø 3.1 … 8.7 mm or
0.12 … 0.34 inch)
Ground connection max. 4 mm²
Intermediate housing between
process flange and housing 1.4435
1)
Similar to DIN 16 086, reference conditions acc. to IEC 770, e.g.
temperature 15 °C … 35 °C; moisture 45 % … 75 %; pressure 860 mbar … 1060 mbar
2)
The adjustment time (also actuating time, response time or adjustment period) is the time required by the
sensor to output the correct level (with max. 10% deviation) after a sudden level change.
3)
Average emitted power (electromagnetic energy) received by a body per cm² directly in front of the antenna.
The received emitted power depends on the antenna version and the distance.
27292-EN-041227
VEGAPULS 41 – Profibus PA 47
Technical data
Materials
Housing PBT (Valox) or
Aluminium die-casting (GD-AlSi 10 Mg)
Housing with Exd version Aluminium chill casting (GK-AlSi 7 Mg)
Process flange 2.25901 (PVDF)
Wetted materials
(antenna) 2.25901 (PVDF) and TFM
TM
-PTFE
Weights
Weights dependent on the housing materials and Ex concepts.
VEGAPULS 41 1.8 … 2.5 kg
WHG approvals
VEGAPULS 41 radar sensors are approved as part of an overfill protection system for
stationary vessels storing water-endangering liquids.
CE conformity
VEGAPULS 41 radar sensors meet the protective regulations of EMC (89/336/EWG), NSR
(73/23/EWG) and R & TTE regulation (1999/5/EC).
Conformity has been judged acc. to the following standards:
EN 300 683 - 1: 1997
EN 300 440 - 1: 1995
IETS 300-440
Expert opinion No. 0043052-02/SEE, Notified Body
No. 0499
EMC Emission/Susceptibility EN 61 326: 1997/A1: 1998
ATEX EN 50 020: 1994
EN 50 018: 1994
EN 50 014: 1997
NSR EN 61 010 - 1: 1993
48 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
7.2 Approvals
When radar sensors are used in Ex areas or
on ships, the instruments must be suitable
and approved for the explosion zones and
applications.
The suitability is checked by the approval
authorities and is certified in approval documents.
Please note the attached approval documents when using a sensor in Ex area.
Test and approval authorities
VEGAPULS radar sensors are tested and
approved by the following monitoring, test
and approval authorities:
- PTB
(Physikalisch Technische Bundesanstalt Physical Technical Approval Authority)
- FM
(Factory Mutual Research)
- ABS
(American Bureau of Shipping)
- LRS
(Lloyds Register of Shipping)
- GL
(German Lloyd)
- CSA
(Canadian Standards Association)
27292-EN-041227
VEGAPULS 41 – Profibus PA 49
Technical data
7.3 Data format of the output signal
Byte4 Byte3 Byte2 Byte1 Byte0
Status Measured value (IEEE-754 format, see below)
Status byte:
The status byte corresponds to Profile 3.0 „Profibus PA Profile for Process Control Devices“
coded. The status „Measured value OK“ is coded as 80 (hex) (Bit7 = 1, Bit 6 … 0 = 0).
Measured value:
The measured value is transmitted as 32 Bit floating point number in the IEEE-754 format.
Byte n Byte n+1
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
7654321076543210
VZ 27262524232221202-12-22-32-42-52-62
Sign
Exponent Mantissa
Byte n+2 Byte n+3
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
7654321076543210
2-82-92
-102-112-122-132-142-152-162-172-182-192-202-212-222-23
-7
Mantissa Mantissa
Formula: Meas. value = (-1)VZ • 2
Examples: 41 70 00 00 (hex) = 0100 0001 0111 0000 0000 0000 0000 0000 (bin)
Meas. value = (-1)
= 1 • 2
(Exponent - 127)
0
(130 - 127)
• 2
3
• (1 + 0.5 + 0.25 + 0.125)
• (1 + Mantissa)
• (1 + 2-1 + 2-2 + 2-3)
= 1 • 8 • 1.875
= 15.0
50 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
7.4 Dimensions
External indicating instrument VEGADIS 50
85
38
ø5
48
10
Pg 13,5
Mounting on carrier rail 35 x 7.5 acc. to EN 50 022 or flat
screwed
118
108
135
Flange dimensions acc. to ANSI (RF)
d
2
f
d
1
k
D
82
b
Note:
The diameter of the connection cable should
be min. 5 mm and max. 9 mm.
Otherwise the seal effect of the cable entry
85
would not be ensured.
D=outer flange diameter
b = flange thickness
k = diameter of hole circle
d
= seal ledge diameter
1
f = seal ledge thickness
1
/16" = approx. 1.6 mm
d
= diameter of holes
2
Size Flange Seal ledge Holes
Db k d1No. d
2
2" 150 psi 152.4 20.7 120.7 91.9 4 19.1
3" 150 psi 190.5 25.5 152.4 127.0 4 19.1
4" 150 psi 228.6 25.5 190.5 157.2 8 19.1
6" 150 psi 279.4 27.0 241.3 215.9 8 22.4
Adjustment module MINICOM
ESC
+
-
Tank 1
m (d)
12.345
67,5
74
27292-EN-041227
VEGAPULS 41 – Profibus PA 51
32,5
OK
Adjustment module for insertion into sensors
or into the external indicating instrument
VEGADIS 50
Sensor dimensions
Technical data
PBT Aluminium
201
165
1
0
˚
322
182
M20x1,5
125
101
0
7
3
5
0
2
SW 60
83
185
G1½ A
1½" NPT
Aluminium with Exd
terminal compartment
215
25
116
0
7
3
M20x1,5
135
130
20
215
185
5
0
2
116
25
½" NPT
52 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
7.5 CE conformity declaration
27292-EN-041227
VEGAPULS 41 – Profibus PA 53
Technical data
54 VEGAPULS 41 – Profibus PA
27292-EN-041227
Technical data
27292-EN-041227
VEGAPULS 41 – Profibus PA 55
VEGA Grieshaber KG
Am Hohenstein 113
77761 Schiltach
Germany
Phone (07836) 50-0
Fax (07836) 50-201
E-Mail info@de.vega.com
www.vega.com
ISO 9001
All statements concerning scope of delivery, application, practical
use and operating conditions of the sensors and processing systems correspond to the information available at the time of printing.
Technical data subject to alterations
27292-EN-041227
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