VEGA SON54P User Manual
Operating Instructions
VEGASON 54P … 56P (Profibus PA)
Level and Pressure
PROF I
PROCESS FIELD BUS
BUS
Contents
Safety information ........................................................................ 2
Note Ex area ................................................................................ 2
1 Product description
1.1 Function ................................................................................. 4
1.2 Application features ............................................................. 5
1.3 Profibus output signal .......................................................... 6
1.4 Adjustment ............................................................................ 7
1.5 Type survey ........................................................................ 11
1.6 Type code ........................................................................... 12
2 Mounting and installation
2.1 Mounting ............................................................................. 13
2.2 General installation instructions ........................................ 15
2.3 Measurement of liquids ..................................................... 17
2.4 Measurement of solids ...................................................... 19
2.5 Socket extensions ............................................................. 20
2.6 False echoes ...................................................................... 21
2.7 Installation mistakes ........................................................... 23
Contents
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.
2 VEGASON 54P … 56P
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 and come with the Ex approved instruments.
Contents
3 Electrical connection
3.1 Connection .......................................................................... 26
3.2 Connection cables and bus configuration ....................... 26
3.3 Sensor address ................................................................. 29
3.4 Connection of the sensor .................................................. 31
3.5 Connection of the external indicating instrument ............ 32
3.6 Bus configuration ............................................................... 33
4 Setup
4.1 Adjustment media .............................................................. 38
4.2 Adjustment with the PC ...................................................... 39
4.3 Adjustment with the adjustment module MINICOM ........ 39
5 PA function diagram and parameters
5.1 PA function diagram........................................................... 46
5.2 Status bytes ....................................................................... 50
5.3 Parameter listing ................................................................ 51
6 Diagnosis
6.1 Simulation ............................................................................ 56
6.2 Error codes ........................................................................ 56
7 Technical data
7.1 Data ..................................................................................... 57
7.2 Data format of the output signal ........................................ 62
7.3 Approvals ........................................................................... 63
7.4 Dimensions ......................................................................... 63
VEGASON 54P … 56P 3
1 Product description
1.1 Function
Continuous level measurement with ultrasonic
sensors is based on the running time measurement of ultrasonic pulses.
Product description
VEGASON 54 … 56 sensors are a newly
developed generation of extremely compact
ultrasonic sensor for level measurement.
They were developed for liquids and
especially for solids and larger measuring
distances. They are the right choice for
applications in silos, bunkers and material
dumps.
Due to small housing dimensions and process fittings, the compact sensors are an
unobtrusive, and most of all, very costeffective solution for your level measurement
applications. With the integrated display and
a special sensor intelligence in conjunction
with large measuring ranges, they enable
high-precision level measurement and can
be used for applications in which the advantages of non-contact measurement could
never before be realised.
The outputs generate a digital Profibus PA
signal as output, i.e. measurement signal.
Measuring principle
High-performance piezoceramic transducers
emit focused ultrasonic pulses which are
reflected by the product surface. The measurement electronics prepares a precise image of the environment from the reflected
ultrasonic pulses. The transducers work both
as transmitter and receiver. As receiver, the
transducers are high-sensitivity piezo microphones.
Meas.
distance
emission - reflection - reception
The measurement electronics precisely calculates the distance between transducer and
medium from the speed of sound and the
measured running time of the emitted sound
impulse. The distance is then converted into
a level-proportional signal and, in conjunction
with the sensor parameter settings, made
available as a precise, calibrated level value.
Since the speed of sound is subject to temperature influence, the transducer also continuously detects the ambient temperature, so that the level is precisely measured
even in case of varying ambient temperature.
4 VEGASON 54P … 56P
Product description
Output signal
The level-proportional Profibus PA measurement signal is processed and outputted
completely digitally. Digital processing of the
measurement signal ensures an accuracy
which could be never reached by an analogue measurement signal, as the digital
signal is always transmitted error-free right
up to the last decimal position. Varying
resistances or tiny leakage currents do not
influence the accuracy of digital technology.
The digital signal is always clear and unambiguous.
The digital signal, giving a faithful representation of the adjusted measuring range of the
sensor, can be modified by various parameter settings.
Measured value display
As an option, the series 50 ultrasonic sensors
can be equipped with an indicating instrument for direct, local level survey. The indicating instrument shows the precise level by
means of the analogue bar graph and the
digital number value. In addition to the indication in the sensor, you can have the level
displayed with the VEGADIS 50 external
indicating instrument at a distance of up to 25
m from the sensor. The external measured
value display operates, like the integrated
display, independently of the PA output signal
and can be modified through individual parameter settings.
1.2 Application features
Two-wire technology
• Power supply and output signal on one
two-wire cable.
• Output signal and signal processing completely digital, therefore maximum accuracy.
• Profibus profile 3 – sensor.
Applications
• Level measurement of solids, liquids and
pastes.
• Gauge measurement, distance measurement, object monitoring and conveyor belt
monitoring.
Rugged and precise
• Measurement unaffected by substance
properties such as density, conductivity,
dielectric constant…
• Suitable for corrosive substances.
• Measuring range 0.8 m … 70 m.
Adjustment options
• With adjustment software VEGA Visual
Operating (VVO) on the PC.
• With detachable adjustment module
MINICOM.
Measured value display
• Measured value display integrated in the
sensor.
• Optional display separate from sensor.
• Adjustment module MINICOM in sensor.
Connection to any process
• G 1 A, DN 50, DN 80, DN 200, DN 250
Approvals
• CENELEC, ATEX, PTB
VEGASON 54P … 56P 5
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). Layers 3 … 5 have not yet been
developed as a standard, leaving Profibus
with far-reaching perspectives for the future.
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
enables power supply over the bus. Up to 32
sensors can be operated on a shielded twowire 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 according 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
VEGASON Profibus sensor. This file is necessary for integrating the sensor into the bus
system. The GSD file (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 loaded
from the VEGA homepage:
http://www.vega.com.
Do not confuse the GSD file with the EDD
(Electronic Device Description), a file necessary for the PDM environment (this can be
also found on the VEGA homepage).
6 VEGASON 54P … 56P
Product description
1.4 Adjustment
Each measuring situation is unique. For that
reason, every ultrasonic sensor needs 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 VEGASON
ultrasonic sensors. The output of echo
curves or the calculation of vessel linearisation curves by means of vessel dimensions are only two examples.
Profibus adjustment scheme
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, a manufacturer-independent adjustment program which could be
operated directly on the Profibus DP, as well
as at any system node (e.g. the engineering
station or the process control), would be
ideal.
In the past, only the program "SIMATIC PDM",
based on the HART® adjustment scheme,
could fulfil this wish (though with the limitations common to HART®). As with 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 for the VEGA HART® instruments, a
DD (Device Description) for each sensor.
We are aware of the disadvantages of the
HART® environment: 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 program 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
TM 1)
. An association of a
number of process technology companies
developed PACTwareTM: a Process Automation Configuration Tool that can run different
manufacturer software tools under a standardised user interface and adjustment
scheme. Specialists call this technology Field
Device Transcription. 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 required for SIMATIC PDM,
are not necessary.
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 the control room
- adjustment with the manufacturer-inde-
pendent user interface PACTwareTM on the
sensor, from the control room or on the
segment coupler.
VEGASON 54P … 56P 7
Product description
Adjustment with the adjustment program VVO - VEGA Visual Operating
The setup and adjustment of the ultrasonic
sensors is generally done on the PC with the
adjustment program VEGA Visual Operating
(VVO) under Windows®. The program leads
quickly through adjustment and parameter
setting by means of pictures, graphics and
process visualisations.
Note:
The adjustment program VVO must be available in version 2.70 or higher.
The VEGA adjustment software VVO (VEGA
Visual Operating) operates either as a
subprogram of the host program PACTware
acc. to the FDT concept (Field Device Tool) or
as an independent adjustment program on
any PC, engineering station or process control computer.
The adjustment program recognises the sensor type
Visualised input of a vessel linearisation curve in the
adjustment program VVO
VEGA’s adjustment program VVO can access the adjustment options of VEGA sensors in their entirety and, if necessary, can
update the complete sensor software. For
communication with Profibus sensors, the
adjustment program either requires 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
respective sensor.
The adjustment and parameter data can be
TM
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 program VVO is
often installed as a tool on an engineering
station or an operating station. VVO then
accesses all VEGA sensors directly over the
bus via the Profibus interface card (e.g. from
Softing) as Master Class 2, from the DP level
to the PA level (via segment coupler) right
down to the individual sensor.
Beside the instrument master file (GSD), with
which a sensor is logged into the Profibus
system, the majority of all Profibus sensors
requires for adjustment, beside the specific
adjustment software, also a so-called EDD
(Electronic Device Description) for each
sensor, in order to access and adjust the
sensor from the bus levels. This is not the
case with VVO. The adjustment software
VVO can communicate at any time with all
VEGA sensors without the help of a special
database. Of course, all other non-Profibus
VEGA sensors can be adjusted with the
adjustment software as well (4 … 20 mA
sensors or VBUS sensors). With VEGA sensors, it is not necessary to go looking for the
latest EDD. This is the essential requirement
for a manufacturer-independent adjustment
program, like PACTwareTM, anticipated by
many users, see following pages.
8 VEGASON 54P … 56P
Product description
Adr. 21
SPS
Adr. 22
VVO
3
PA-
Adr. 23
Bus
Master-Class 1
Adr. 1
DP-Bus
Adr. 24
Adr. 10
Adr. 25 … 56
2
Profibus DP interface card as
Master-Class 2 (e.g. Softing)
3
Adr. 58
Adr. 57
Segment coupler
(max. 32 participants)
Adr. 60
Adr. 59
Adr. 26
Adr. 25
Adr. 27
Adr. 28
Adr. 29
Adjustment of the VEGASON ultrasonic 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).
VEGASON 54P … 56P 9
Product description
Adjustment with adjustment module
MINICOM
With the small (3.2 cm x 6.7 cm) 6-key adjustment module with display, you carry out
the adjustment in clear text dialogue. The
adjustment module can be plugged into the
ultrasonic sensor or into the optional, external
indicating instrument.
Tank 1
m (d)
12.345
Detachable adjustment module MINICOM
The adjustment module can be easily removed to prevent unauthorised sensor adjustment.
ESC
+
-
Tank 1
m (d)
12.345
OK
2
Tank 1
m (d)
12.345
4
PA-Bus
ESC
+
-
OK
ESC
+
-
OK
Adjustment with the 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 input of the
measuring environment or 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
(http://www.vega.com).
Adjustment with PACTware
PACTwareTM is a manufacturer-independent
automation/configuration tool through which
access to instruments of different manufacturers (Krohne, Pepperl + Fuchs, VEGA,
WIKA-, Bürkert…) is possible. The VEGA
adjustment software VVO works as a
subprogram/menu. PACTwareTM activates the
required menu options for the sensor/instrument being accessed.
PACTwareTM looks different than VVO and is
designed with a tree structure. Operating
instructions for PACTwareTM can be found in
the PACTware
described in this operating instructions
manual.
TM
documentation. They are not
TM
max. 2.5 m
Adjustment with detachable adjustment module. The
adjustment module can be plugged into the ultrasonic
sensor or into the external indicating instrument
VEGADIS 50.
10 VEGASON 54P … 56P
Product description
1.5 T ype survey
VEGASON 54 … 56 sensors are a newly
developed generation of very compact ultrasonic sensors for large measuring ranges.
For shorter measuring ranges, VEGASON
51 … 53 sensors are used.
Thanks to the small housing dimensions and
process fittings, the compact sensors are a
very cost-effective solution for your level
measurement applications. Swivelling holders
enable quick orientation of the transducers to
the liquid or solid surface. Because the sensor electronics and transducer can be separated, installation is very simple. It is possible
to separate the sensor electronics up to
300 m from the transducer. As a result, the
transducer can handle ambient temperatures
up to 150°C (VEGASON 56).
General features
• Application in solids and liquids.
• Measuring range 0.8 m … 70 m.
• Ex-approved in Zone 10 (IEC) or Zone 11
(ATEX) classification mark EEx ia [ia] IIC T6
or Zone 20/21/22, VEGASON 56 also
Zone 1.
• Integrated measured value display in the
sensor or in the external indicating instrument which can be mounted up to 25 m
away from the sensor.
VEGASON 54
Version A Version B Version C Version D
VEGASON 55
Version A Version B Version C Version D
VEGASON 56
Version A Version B Version C Version D
VEGASON 54P … 56P 11
1.6 Type code
Product description
VEGASON 54 K EX.XX X X X X X X X
K - Plastic housing PBT, M20 x 1.5 cable entry
N - Plastic housing PBT,
A - Aluminium housing, M20 x 1.5 cable entry
FEP - Version A, flange DN 200 (PP)
FEA - Version A, flange DN 200 (Aluminium)
FLP - Version A, flange 8" (PP)
FLA - Version A, flange 8" (Aluminium)
SAS - Version B, flange swivelling holder DN 50
SBS - Version B, flange swivelling holder DN 80
GAS - Version C, flange swivelling holder DN 50
GBS - Version C, flange swivelling holder DN 80
RGS - Thread G 1 A
YYY - Other process fittings
X - without display
A - with integrated display
X - without adjustment module MINICOM
B - with adjustment module MINICOM (mounted)
A - 20 … 72 V DC; 20 … 250 V AC; 4 … 20 mA (four-wire)
B - 20 … 72 V DC; 20 … 250 V AC; 4 … 20 mA, HART
(four-wire)
E - Power supply via signal conditioning instrument
G - Segment coupler for Profibus PA
P - 90 … 250 V AC (only in USA)
N - 20 … 36 V DC, 24 V AC (only in USA)
Z - Supply via signal conditioning instrument (only in USA)
.X - without approval
EXS.X - StEx Zone 10
K - Analogue 4 … 20 mA output signal (two-wire or
four-wire technology)
V - Digital output signal (two-wire technology)
P - Profibus
Type 54 - Measuring range 1.0 … 25 m
Type 55 - Measuring range 0.8 … 45 m
Type 56 - Measuring range 1.6 … 70 m
Measuring principle (SON for ultrasonic)
½" NPT cable entry
®
12 VEGASON 54P … 56P
Mounting and installation
2 Mounting and installation
2.1 Mounting
Version A
Sensors in version A (flange version) are
supplied completely assembled and ready
for operation. Immediately after mounting on
the vessel and electrical connection, they are
ready for operation.
Version B
Sensors in version B are supplied in two
parts (transducer and sensor electronics).
First of all, mount the transducer on the vessel or above the medium. There is a four-pole
jack at the end of the transducer tube. The
respective counterpart to the jack protrudes
out of the lower side of the sensor electronics. Insert the plug of the sensor electronics
(only possible in one position) into the jack of
the transducer tube. Continue pushing the
electronics housing onto the transducer tube,
on which there is a wide and a narrow
groove.
Groove for locking the
headless screw
Mounting groove (must
no longer be visible after
mounting)
The wide groove is used for locking the
headless screws. The narrow groove is an
assembly mark. Move the electronics housing farther down over the transducer tube
until the mounting groove is no longer visible.
Fasten the housing with the headless screws
to the transducer tube. Use a 5 mm hexagon
screwdriver (or Allen wrench).
VEGASON 54P … 56P 13
Mounting and installation
Ver sion C and D
The sensors in version C and D are supplied
in three parts (transducer, sensor electronics
and transducer cable). First mount the transducer (see version B). There is a four-pole
jack at the transducer tube end. A respective
counterpart to the jack is provided in the
connection cylinder of the transducer cable.
Insert the connection cylinder plug into the
jack of the transducer tube. S
Connection
cylinder
Mounting
bracket
Connection
cylinder
Transducer
cable
On the end of the transducer tube you find a
wide and a narrow groove. The wide groove
is used for locking the cylinder with the headless screws. The narrow groove is the assembly mark.
Then push the connection cylinder onto the
transducer tube (with a slight swivelling motion) until the assembly mark is no longer
visible.
When the assembly mark is covered by the
cylinder, fasten the cylinder with the two
headless screws. Use a 5 mm hexagon
screwdriver (or Allen wrench).
Now mount the sensor electronics at the
requested location. The sensor electronics is
fastened to a mounting bracket so that it can
be mounted on a plain surface or on a wall.
Make sure that the sensor electronics is
mounted in such a way that there is enough
space above the electronics to open the
cover.
Now insert the plug at the other end of the
transducer cable into the jack on the electronics housing.
Note:
Avoid bending the transducer cable too
sharply when laying it out. This is a special
cable which could otherwise be damaged.
In addition, make sure that the cable cannot
be damaged during operation. A signal with
a voltage of approx. 1 kV is transmitted
(which could be a danger in Ex areas if the
cable is damaged) via the shielded cable
cores.
Groove for locking the
headless screws
Mounting groove (must
no longer be visible after
mounting)
14 VEGASON 54P … 56P
Mounting and installation
2.2 General installation instructions
Measuring range
version, the instrument flange (version A).
Please note the information on the reference
Beside other criteria, you select your instrument according to the required measuring
range. The reference plane for the min. and
planes in chapter "7.4 Dimensions". The max.
filling depends on the required min. distance
and the mounting location.
max. distance to the liquid or solids is the
transducer end, or for instruments in flange
Reference plane
min. distance
1.0 m
100 %
0 %
Span
Min. distance, max. measuring range, span and reference plane
0 %
max. meas. range
max. meas. distance 25 m (type 54), 45 m (type 55), 70 m (type 56)
min. distance 0.8 m
100 %
Span
Reference plane
min. distance 1.4 m
100 %
0 %
Span
Beam angle and false echoes
At greater distance, the energy of the ultrasonic impulses distributes over a large area,
The ultrasonic impulses are focused by the
transducers. The impulses leave the transducer in a conical form similar to the beam
pattern of a spotlight. The beam angle is 4°
thus causing weaker echoes from obstructing surfaces. The interfering signals are
therefore less critical than those at close
range.
(VEGASON 54), 5° (VEGASON 55) and 6°
(VEGASON 56) at -3 dB emitted power.
Any object, e.g. tubes or struts inside this
emission cone will cause a large false echo.
Especially within the first few meters of the
If possible, orient the sensor axis perpendicularly to the product surface and avoid
vessel installations (e.g. pipes and struts)
within the 100 % area of the emission cone.
emission cone, pipes, 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.
VEGASON 54P … 56P 15
The following illustration of the ultrasonic
beams is simplified and represents only the
main beam - a number of additional weaker
beams exists.
0 m
Meas.
distance
Mounting and installation
VEGASON 56VEGASON 54
0 m
Emitted power
50 %
100 %
4˚
Emitted power
25 m
Meas.
distance
45 m
0 m
4
0,9
2,0
5˚
10˚
242
0
8˚
m
0,9
2,0
0
VEGASON 55
50 %
Emitted power
100 %
m
Emitted power
Meas. distance
50 %
Emitted power
6˚
100 %
Emitted power
12˚
70 m
3,7
7,5
3,7
0
m
7,5
Therefore, in practical application, the transducer has to be oriented so that the lowest
possible false echo signal strength is
achieved. Only giving attention to the size of
the useful echo is usually not adequate under
difficult measuring conditions. In most cases,
a low false echo level enables the sensor to
reliably pick up the useful echo. With the
adjustment software VVO on the PC, you can
view the echo image (see manual VVO "Sensor optimisation".
16 VEGASON 54P … 56P
Mounting and installation
2.3 Measurement of liquids
Flat vessel top
On flat vessels, mounting is usually done on
a very short DIN socket piece. The lower
side of the flange is the reference plane. The
transducer should protrude out of the flange
pipe.
< 100 mm
VEGASON 55 in flange version on short DIN socket
piece
< 400 mm
Reference plane
Min. distance
Type 54: 1 m
Type 55: 0.8 m
Reference plane
A mounting location directly on the vessel top
is ideal. A round opening in the vessel top is
sufficient to fasten the sensor with the flange
or version B and C with the swivelling holder.
Reference
plane
Min. meas. distance
1.8 m
Swivelling
holder
Min. meas. dis-
tance 1.4 m
Reference
plane
Flange version and swivelling holder on flat vessel
top
It is also possible to mount version C sensors
in a 1" thread.
Min. distance
1.8 m
< 60 mm
Reference plane
VEGASON 56 in flange version on short DIN socket
piece
Mounting of the transducer in a 1" thread
VEGASON 54P … 56P 17
Dished tank top
On dished tank tops, please do not mount
the instrument in the centre or close to the
vessel wall, but approx. ½ vessel radius from
the centre. Dished tank ends can act as
paraboloidal reflectors. If the transducer is
placed in the focal point of the parabolic tank,
the ultrasonic sensor receives amplified false
echoes. The transducer should be mounted
outside the focal point. Parabolically amplified
echoes can be thereby avoided.
Mounting and installation
Reference plane
< 100 mm
½ vessel radius
VEGASON 54 on dished tank top; applies also to
VEGASON 55
< 400 mm
1
/2 vessel radius
VEGASON 56 on dished tank top
Reference plane
Open vessels
On open vessels, the sensors can be readily
installed on extended mounting brackets.
Mount the low-weight sensor onto such a
bracket and ensure a sufficient distance from
the vessel wall.
Reference plane
Min. meas.
Min. meas.
distance
distance
Reference plane
Open vessel
18 VEGASON 54P … 56P
Mounting and installation
Pump shaft
Narrow, uneven shafts, wells and vessel
openings with very rough walls and shoulders make ultrasonic measurements extremely difficult due to strong false echoes.
This problem can be overcome by using an
extended socket piece or a complete measuring tube (see chapter "2.5 Socket extension").
see "2.5 Socket extensions"
Socket piece
Shaft pump
Measuring tube socket or measuring tube in a shaft
≥ 250 mm
Shaft pump
Measuring tube
min.
distance
Meas. range
2.4 Measurement of solids
Flange mounting
For containers with solids, as with applications for liquids, the instrument can be
mounted on a short DIN socket piece. The
transducer end should protrude out of the
socket so that it does not interfere with ultrasonic signals. The swivelling holder enables
not only correct orientation to the product
surface but also minimisation of possible
false echoes.
Different filling conditions often lead to a varying product surface orientation. This causes
the useful echo to vary in quality. For this
reason, the transducer should be mounted in
such a way that, even in an empty vessel, the
false echo intensity remains as low as possible. You can view the echo curve on the PC
with the adjustment program VVO.
Reference plane
Shaft
Min. distance
Very good measuring results can be attained
with a measuring tube in continuous narrow
shafts, see illustration. The applied measuring tube must have smooth walls inside (e.g.
PE sewage pipe) and a diameter ≥ 200 mm.
This arrangement works well as long as the
inside of the measuring tube collects no dirt
or buildup (cleaning necessary). You might
want to consider using hydrostatic pressure
transmitters or capacitive measuring probes.
The measuring tube should either be never
immersed in the medium, or always immersed, making the measurement take place
exclusively in the tube.
VEGASON 54P … 56P 19
VEGASON 54C with adapter flange on a DN 200
vessel flange
Mounting and installation
Mounting boss
Reference plane
Min. distance
VEGASON 56 in 1" mounting boss.
The socket axis should be oriented to the
product surface. More suitable is the use of a
swivelling holder version (type B, C), as
described on previous pages.
Material heaps
2.5 Socket extensions
Ultrasonic sensors require a min. distance to
the liquid or solid. Take the min. distance into
account in your planning. In some situations,
it is possible to reach the required min. distance, and hence the desired filling height
with a socket extension. However, the socket
piece increases the noise level of the ultrasonic signal at the extension outlet and can
interfere with the measurement. Only use a
socket extension if all other possibilities have
to be excluded. Carry out the extension as
shown in the following illustration.
Socket extensions for liquids
Chamfer and deburr the socket carefully and
make sure that it has a smooth inner surface.
The socket should not protrude into the
measured product, in case buildup can form
on the socket through dirt or product
residues.
For non-adhesive measured products, a
socket extension in the form of a measuring
tube can be permanently submerged in the
product. The ultrasonic measurement is then
made exclusively in the measuring tube and
works very well without interference from
other vessel installations (see "Pump shaft").
Large material heaps are usually measured
with several instruments, which can be
mounted on e.g. traverse cranes. If material
cones form, we recommend orienting the
sensors to the solid surface.
Socket piece should not be immersed into adhesive
products (figure: VEGASON 54)
Transducer on traverse crane above a material heap
20 VEGASON 54P … 56P
Mounting and installation
The socket diameter should be as large and
the socket length as small as possible. To
minimise false echoes, make sure that the
socket outlet is burr-free.
Typ e 5 4
L
45˚
ø
Socket extensions not immersed into the medium
Typ e 5 5
L
45˚
ø
Max. socket length in relation to socket
diameter
ø in mm L in mm
Type 54 Type 55 Type 56
200 400 – – ––
250 500 500 500
300 –– –– 600
2.6 False echoes
The mounting location of the ultrasonic sensor
must be selected such that no installations or
inflowing material are in the path of the ultrasonic 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, due to
their strong false echoes, adversely effect
the measurement. Shields above these flat
protrusions scatter the false echoes and
guarantee a reliable measurement.
Correct Incorrect
Socket extension in solids
For solids, use a conical socket extension
with a taper of at least 15° … 20°.
Vessel protrusions (slope)
Intake pipes, e.g. for the mixing of materials,
with a flat surface directed towards the sensor should be covered with a sloping shield.
The shield will scatter the false echo.
Correct Incorrect
15˚ 15˚
Socket extension in solids
Vessel protrusions (intake pipe)
VEGASON 54P … 56P 21
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