Vega VEGABAR 81 User manual

Operating Instructions
Pressure transmitter with metallic
measuring cell
VEGABAR 81
Slave sensor for electronic di󰀨erential pres-
sure
Document ID: 45049

2
Contents
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
Contents
1 About this document ............................................................................................................... 4
1.1 Function ........................................................................................................................... 4
1.2 Target group ..................................................................................................................... 4
1.3 Symbols used................................................................................................................... 4
2 For your safety ......................................................................................................................... 5
2.1 Authorised personnel ....................................................................................................... 5
2.2 Appropriate use................................................................................................................ 5
2.3 Warning about incorrect use............................................................................................. 5
2.4 General safety instructions............................................................................................... 5
2.5 EU conformity................................................................................................................... 5
2.6 Installation and operation in the USA and Canada ........................................................... 6
2.7 Environmental instructions ............................................................................................... 6
3 Product description ................................................................................................................. 7
3.1 Conguration.................................................................................................................... 7
3.2 Principle of operation........................................................................................................ 8
3.3 Supplementary cleaning procedures.............................................................................. 10
3.4 Packaging, transport and storage................................................................................... 10
3.5 Accessories.................................................................................................................... 11
4 Mounting................................................................................................................................. 12
4.1 General instructions ....................................................................................................... 12
4.2 Instructions for oxygen applications ............................................................................... 14
4.3 Ventilation and pressure compensation.......................................................................... 14
4.4 Combination Master - Slave ........................................................................................... 16
4.5 Level measurement........................................................................................................ 17
4.6 Dierential pressure measurement ................................................................................ 18
4.7 Interface measurement .................................................................................................. 19
4.8 Density measurement .................................................................................................... 20
4.9 Density-compensated level measurement ..................................................................... 21
4.10 External housing ............................................................................................................ 23
5 Connecting to power supply................................................................................................. 24
5.1 Preparing the connection ............................................................................................... 24
5.2 Connecting..................................................................................................................... 24
5.3 Single chamber housing................................................................................................. 26
5.4 External housing with version IP68 (25 bar) ................................................................... 26
5.5 Connection example ...................................................................................................... 28
6 Set up with the display and adjustment module ................................................................ 29
6.1 Parameter adjustment - Extended adjustment................................................................ 29
7 Diagnosis, asset management and service ........................................................................ 42
7.1 Maintenance .................................................................................................................. 42
7.2 Rectify faults................................................................................................................... 42
7.3 Exchanging the electronics module................................................................................ 42
7.4 Exchange process module on version IP68 (25 bar) ...................................................... 43
7.5 How to proceed if a repair is necessary.......................................................................... 44
8 Dismount................................................................................................................................. 45
8.1 Dismounting steps.......................................................................................................... 45

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Contents
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
8.2 Disposal ......................................................................................................................... 45
9 Supplement ............................................................................................................................ 46
9.1 Technical data ................................................................................................................ 46
9.2 Dimensions .................................................................................................................... 54
9.3 Industrial property rights................................................................................................. 62
9.4 Trademark ...................................................................................................................... 62
Safety instructions for Ex areas
Take note of the Ex specic safety instructions for Ex applications.
These instructions are attached as documents to each instrument
with Ex approval and are part of the operating instructions.
Editing status: 2020-05-12

4
1 About this document
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
1 About this document
1.1 Function
This instruction provides all the information you need for mounting,
connection and setup as well as important instructions for mainte-
nance, fault rectication, the exchange of parts and the safety of the
user. Please read this information before putting the instrument into
operation and keep this manual accessible in the immediate vicinity
of the device.
1.2 Target group
This operating instructions manual is directed to trained personnel.
The contents of this manual must be made available to the qualied
personnel and implemented.
1.3 Symbols used
Document ID
This symbol on the front page of this instruction refers to the Docu-
ment ID. By entering the Document ID on www.vega.com you will
reach the document download.
Information, note, tip: This symbol indicates helpful additional infor-
mation and tips for successful work.
Note: This symbol indicates notes to prevent failures, malfunctions,
damage to devices or plants.
Caution: Non-observance of the information marked with this symbol
may result in personal injury.
Warning: Non-observance of the information marked with this symbol
may result in serious or fatal personal injury.
Danger: Non-observance of the information marked with this symbol
results in serious or fatal personal injury.
Ex applications
This symbol indicates special instructions for Ex applications.
• List
The dot set in front indicates a list with no implied sequence.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Battery disposal
This symbol indicates special information about the disposal of bat-
teries and accumulators.

5
2 For your safety
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
2 For your safety
2.1 Authorised personnel
All operations described in this documentation must be carried out
only by trained, qualied personnel authorised by the plant operator.
During work on and with the device, the required personal protective
equipment must always be worn.
2.2 Appropriate use
VEGABAR 81 is a slave sensor for electronic dierential pressure
measurement.
You can nd detailed information about the area of application in
chapter "Product description".
Operational reliability is ensured only if the instrument is properly
used according to the specications in the operating instructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of this product can give rise to applica-
tion-specic hazards, e.g. vessel overll through incorrect mounting
or adjustment. Damage to property and persons or environmental
contamination can result. Also, the protective characteristics of the
instrument can be impaired.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and directives. The instrument must only be operated in a
technically awless and reliable condition. The operator is responsi-
ble for the trouble-free operation of the instrument. When measuring
aggressive or corrosive media that can cause a dangerous situation
if the instrument malfunctions, the operator has to implement suitable
measures to make sure the instrument is functioning properly.
The safety instructions in this operating instructions manual, the na-
tional installation standards as well as the valid safety regulations and
accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbi-
trary conversions or modications are explicitly forbidden. For safety
reasons, only the accessory specied by the manufacturer must be
used.
To avoid any danger, the safety approval markings and safety tips on
the device must also be observed.
2.5 EU conformity
The device fulls the legal requirements of the applicable EU direc-
tives. By axing the CE marking, we conrm the conformity of the
instrument with these directives.

6
2 For your safety
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
The EU conformity declaration can be found on our homepage.
Due to the design of its process ttings, the device does not subject
of EU pressure device directive if it is operated at process pressures
≤ 200 bar.1)
2.6 Installation and operation in the USA and
Canada
This information is only valid for USA and Canada. Hence the follow-
ing text is only available in the English language.
Installations in the US shall comply with the relevant requirements of
the National Electrical Code (ANSI/NFPA 70).
Installations in Canada shall comply with the relevant requirements of
the Canadian Electrical Code.
2.7 Environmental instructions
Protection of the environment is one of our most important duties.
That is why we have introduced an environment management system
with the goal of continuously improving company environmental pro-
tection. The environment management system is certied according
to DIN EN ISO 14001.
Please help us full this obligation by observing the environmental
instructions in this manual:
• Chapter "Packaging, transport and storage"
• Chapter "Disposal"
1) Exception: Versions with measuring ranges from 250 bar. These are subject
of the EU Pressure Device Directive.

7
3 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
3 Product description
3.1 Conguration
The scope of delivery encompasses:
• Pressure transmitter VEGABAR 81 - Slave sensor
• Ready-made connection cable, unassembled cable gland
The further scope of delivery encompasses:
• Documentation
– Quick setup guide VEGABAR 81
– Test certicate for pressure transmitters
– Instructions for optional instrument features
– Ex-specic "Safety instructions" (with Ex versions)
– If necessary, further certicates
Information:
Optional instrument features are also described in this operating
instructions manual. The respective scope of delivery results from the
order specication.
This operating instructions manual applies to the following instrument
versions:
• Hardware from 1.0.0
• Software version from 1.0.0
Note:
You can nd the hardware and software version of the instrument as
follows:
• On the type plate of the electronics module
• In the adjustment menu under "Info"
The type label contains the most important data for identication and
use of the instrument:
7
6
4
5
2
3
1
Fig. 1: Layout of the type label (example)
1 Product code
2 Field for approvals
3 Technical data
4 Serial number of the instrument
5 QR code
6 Symbol of the device protection class
7 ID numbers, instrument documentation
Scope of delivery
Scope of this operating
instructions
Type label

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3 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
The type label contains the serial number of the instrument. With it
you can nd the following instrument data on our homepage:
• Product code (HTML)
• Delivery date (HTML)
• Order-specic instrument features (HTML)
• Operating instructions and quick setup guide at the time of ship-
ment (PDF)
• Order-specic sensor data for an electronics exchange (XML)
• Test certicate (PDF) - optional
Move to "www.vega.com" and enter in the search eld the serial
number of your instrument.
Alternatively, you can access the data via your smartphone:
• Download the VEGA Tools app from the "Apple App Store" or the
"Google Play Store"
• Scan the DataMatrix code on the type label of the instrument or
• Enter the serial number manually in the app
3.2 Principle of operation
VEGABAR 81 is suitable for applications in virtually all industries. It is
used for the measurement of the following pressure types.
• Gauge pressure
• Absolute pressure
• Vacuum
Measured products are gases, vapours and liquids.
The chemical seal systems of VEGABAR 81, which are optimally
adapted to the process, also allow measurement of highly corrosive
and hot products.
The electronic dierential pressure measurement is suitable for the
measurement of the following process variables:
• Level
• Flow
• Dierential pressure
• Density
• Interface
• Level, density-compensated
The VEGABAR 81 slave sensor is combined with a sensor from the
instrument series for electronic dierential pressure measurement.
Serial number - Instru-
ment search
Application area
Measured products
Measured variables
Electronicdierential
pressure

9
3 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
1
2
Fig. 2: Example, electronic dierential pressure for level measurement in pres-
surized vessel
1 VEGABAR 81
2 VEGABAR 81, slave sensor
The sensors are connected via a screened four-wire cable.The
measured value from the slave sensor is read in and factored into the
calculations. Power supply and parameter adjustment are carried out
through the master sensor.
Information:
The sensor versions "Relative pressure climate-compensated" as
well as "Double chamber housing" are not suitable for connection of a
slave sensor.
You can nd further information in chapter "Combination Master -
Slave " of this operating instructions.
Relative pressure: the measuring cell is open to the atmosphere.
The ambient pressure is detected in the measuring cell and compen-
sated. It thus has no inuence on the measured value.
Absolute pressure: the measuring cell contains vacuum and is
encapsulated. The ambient pressure is not compensated and does
hence inuence the measured value.
Relative pressure: the measuring cell is open to the atmosphere.
The ambient pressure is detected in the measuring cell and compen-
sated. It thus has no inuence on the measured value.
Pressure types
Pressure types

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3 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
Absolute pressure: the measuring cell contains vacuum and is
encapsulated. The ambient pressure is not compensated and does
hence inuence the measured value.
The measuring system is completely welded and thus sealed against
the process.
The process tting is sealed against the process by a suitable seal. It
must be provided by the customer, depending on the process tting
also included in the scope of delivery, see chapter "Technical data",
"Materials and weights".
3.3 Supplementary cleaning procedures
The VEGABAR 81 is also available in the version "Oil, grease and
silicone-free". These instruments have passed through a special
cleaning procedure to remove oil, grease and paint-wetting impair-
ment substances (PWIS).
The cleaning is carried out on all wetted parts as well as on surfaces
accessible from outside. To keep the purity level, the instruments are
immediately packed in plastic foil after the cleaning process. The
purity level remains as long as the instrument is kept in the closed
original packaging.
Caution:
The VEGABAR 81 in this version may not be used in oxygen ap-
plications. For this purpose, instruments are available in the special
version "Oil, grease and silicone-free for oxygen applications".
3.4 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging consists of environment-friendly, recyclable card-
board. For special versions, PE foam or PE foil is also used. Dispose
of the packaging material via specialised recycling companies.
Transport must be carried out in due consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
• Not in the open
• Dry and dust free
Seal concept
Packaging
Transport
Transport inspection
Storage

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3 Product description
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
• Not exposed to corrosive media
• Protected against solar radiation
• Avoiding mechanical shock and vibration
• Storage and transport temperature see chapter "Supplement -
Technical data - Ambient conditions"
• Relative humidity 20 … 85 %
With instrument weights of more than 18 kg (39.68 lbs) suitable and
approved equipment must be used for lifting and carrying.
3.5 Accessories
The instructions for the listed accessories can be found in the down-
load area on our homepage.
The protective cover protects the sensor housing against soiling and
intense heat from solar radiation.
Screwed anges are available in dierent versions according to the
following standards: DIN 2501, EN 1092-1, BS 10, ASME B 16.5,
JIS B 2210-1984, GOST 12821-80.
Welded sockets are used to connect the sensors to the process.
Threaded adapters enable simple adaptation of sensors with stand-
ard threaded ttings, e.g. to process-side hygiene connections.
Storage and transport
temperature
Lifting and carrying
Protective cover
Flanges
Welded sockets and
adapters

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4 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
4 Mounting
4.1 General instructions
Note:
For safety reasons, the instrument must only be operated within the
permissible process conditions. You can nd detailed information on
the process conditions in chapter "Technical data" of the operating
instructions or on the type label.
Hence make sure before mounting that all parts of the instrument ex-
posed to the process are suitable for the existing process conditions.
These are mainly:
• Active measuring component
• Process tting
• Process seal
Process conditions in particular are:
• Process pressure
• Process temperature
• Chemical properties of the medium
• Abrasion and mechanical inuences
Protect your instrument against moisture ingress through the following
measures:
• Use a suitable connection cable (see chapter "Connecting to
power supply")
• Tighten the cable gland or plug connector
• Lead the connection cable downward in front of the cable entry or
plug connector
This applies mainly to outdoor installations, in areas where high
humidity is expected (e.g. through cleaning processes) and on cooled
or heated vessels.
Note:
Make sure that the degree of contamination specied in chapter
"Technical data" meets the existing ambient conditions.
Note:
Make sure that during installation or maintenance no moisture or dirt
can get inside the instrument.
To maintain the housing protection, make sure that the housing lid is
closed during operation and locked, if necessary.
Devices with threaded tting are screwed into the process tting with
a suitable wrench via the hexagon.
See chapter "Dimensions" for wrench size.
Process conditions
Protection against mois-
ture
Screwing in

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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
Warning:
The housing or the electrical connection may not be used for screw-
ing in! Depending on the device version, tightening can cause dam-
age, e. g. to the rotation mechanism of the housing.
If there is strong vibration at the mounting location, the instrument
version with external housing should be used. See chapter "External
housing".
The permissible process pressure range is specied by "MWP" (Maxi-
mum Working Pressure) on the type label, see chapter "Structure".
The MWP takes the element of the measuring cell and processing
tting combination with the weakest pressure into consideration and
may applied permanently. The specication refers to a reference
temperature of +20 °C (+68 °F). It also applies when a measuring cell
with a higher measuring range than the permissible pressure range of
the process tting is installed order-related.
In order to prevent damage to the device, a test pressure may only
exceed the specied MWP briey by 1.5 times at reference tempera-
ture. The pressure stage of the process tting as well as the overload
resistance of the measuring cell are taken into consideration here
(see chapter "Technical Data").
In addition, a temperature derating of the process tting, e. g. with
anges, can limit the permissible process pressure range according
to the respective standard.
The permissible process pressure range is stated on the type label.
The instrument should only be operated with these pressures if the
mounting accessory used also fulls these values. This should be en-
sured by suitable anges, welded sockets, tension rings with Clamp
connections, sealings, etc.
Higher process temperatures often mean also higher ambient
temperatures. Make sure that the upper temperature limits stated in
chapter "Technical data" for the environment of the electronics hous-
ing and connection cable are not exceeded.
1
2
Fig. 3: Temperature ranges
1 Process temperature
2 Ambient temperature
Vibrations
Permissible process
pressure (MWP) - Device
Permissible process
pressure (MWP) - Mount-
ing accessory
Temperature limits

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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
4.2 Instructions for oxygen applications
Oxygen and other gases can be explosive when brought into contact
with oils, grease and plastics, so the following measures must also be
taken:
• All components of the system, e.g. measuring instruments, must
be cleaned in accordance with the requirements of recognized
regulations or standards
• Depending on the seal material, certain temperatures and pres-
sures must not be exceeded in oxygen applications, see chapter
"Technical data"
Danger:
Instruments for oxygen applications must be unpacked just before
mounting. After removing the protective cover of the process tting,
the label "O2" will be visible on the process tting. Penetration of oil,
grease and dirt should be avoided. Danger of explosion!
4.3 Ventilation and pressure compensation
The lter element in the electronics housing has the following func-
tions:
• Ventilation of the electronics housing
• Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
Caution:
The lter element causes a time-delayed pressure compensation.
When quickly opening/closing the housing cover, the measured value
can change for approx. 5 s by up to 15 mbar.
For an eective ventilation, the lter element must be always free from
buildup. In case of horizontal mounting, turn the housing so that the
lter element points downward after the instrument is installed. This
provides better protection against buildup.
Caution:
Do not use a high-pressure cleaner. The lter element could be dam-
aged, which would allow moisture into the housing.
The following paragraphs describe how the lter element is arranged
in the dierent instrument versions.
Oxygen applications
Filter element - Function

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4 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
1 2 3
4 4 4
Fig. 4: Position of the lter element - non-Ex, Ex-ia version
1 Plastic, stainless steel housing (precision casting)
2 Aluminium housing
3 Stainless steel housing (electropolished)
4 Filter element
With the following instruments a blind plug is installed instead of the
lter element:
• Instruments in protection IP66/IP68 (1 bar) - ventilation via capillar-
ies in non-detachable cable
• Instruments with absolute pressure
→ Turn the metal ring in such a way that the lter element points
downward after installation of the instrument. This provides better
protection against buildup.
1
2
Fig. 5: Position of the lter element - Ex-d version
1 Rotatable metal ring
2 Filter element
Instruments with absolute pressure have a blind plug mounted
instead of the lter element.
The process assembly of instruments with Second Line of Defense
(gastight leadthrough) is completely encapsulated. An absolute pres-
sure measuring cell is used so that no ventilation is required.
Filter element - Position
Filter element - Position
Ex-d version
Instruments with Second
Line of Defense

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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
1
2
Fig. 6: Position of the lter element - gastight leadthrough
1 Filter element
1
Fig. 7: Position of the lter element - IP69K version
1 Filter element
Instruments with absolute pressure have a blind plug mounted
instead of the lter element.
4.4 Combination Master - Slave
In principle, any sensor combination within the instrument series is
allowed. The following requirements must be fullled:
• Conguration, Master sensor suitable for electronic dierential
pressure
• Pressure type is identical for both sensors, i.e. relative pressure/
relative pressure or absolute pressure/absolute pressure
• Master sensor measures the higher pressure
• Measurement setup as shown in the following chapters
The measuring range of each sensor is selected such that it ts the
measuring loop. For this, the max. recommended turn down must be
noted. See chapter "Technical data". It is absolutely necessary the the
measuring ranges of Master and Slave correspond.
Measurement result = Measured value of Master (total pres-
sure) - measured value of Slave (static pressure)
Depending on the application, individual combinations can result, see
following examples:
Data
Application: Level measurement
Medium: Water
Filter element - Position
IP69K version
Example - large vessel

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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
Vessel height: 12 m, hydrostatic pressure = 12 m x 1000 kg/m3x
9.81 m/s2 = 117.7 kPa = 1.18 bar
Superimposed pressure: 1 bar
Total pressure: 1.18 bar + 1 bar = 2.18 bar
Instrument selection
Nominal measuring range Master: 2.5 bar
Nominal measuring range Slave: 1 bar
Turn Down: 2.5 bar/1.18 bar = 2.1 : 1
Data
Application: Level measurement
Medium: Water
Vessel height: 500 mm, hydrostatic pressure = 0.50 m x 1000 kg/m3x
9.81 m/s2 = 4.9 kPa = 0.049 bar
Superimposed pressure: 350 mbar = 0.35 bar
Total pressure: 0.049 bar + 0.35 bar = 0.399 bar
Instrument selection
Nominal measuring range Master: 0.4 bar
Nominal measuring range Slave: 0.4 bar
Turn Down: 0.4 bar /0.049 bar = 8.2 : 1
Data
Application: Dierential pressure measurement
Medium: Gas
Static pressure: 0.8 bar
Dierential pressure on orice: 50 mbar = 0.050 bar
Total pressure: 0.8 bar + 0.05 bar = 0.85 bar
Instrument selection
Nominal measuring range Master: 1 bar
Nominal measuring range Slave: 1 bar
Turn Down: 1 bar/0.050 bar = 20 : 1
The measuring result (level, pressure dierence) as well as meas-
ured value Slave (static or superimposed pressure) are output by the
sensor. Depending on the instrument version, output as 4 … 20 mA
signal or digitally via HART, Probus PA or Foundation Fieldbus.
4.5 Level measurement
The master/slave combination is suitable for level measurement in a
pressurized vessel
Keep the following in mind when setting up the measuring system:
• Mount the master sensor below the min. level
• Do not mount the master sensor close to the lling stream or
emptying area
Example - small vessel
Example-oricein
pipeline
Output measured values
Measurement setup

18
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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
• Mount the master sensor so that it is protected against pressure
shocks from the stirrer
• Mount the slave sensor above the max. level
1
2
Fig. 8: Measurement setup, level measurement in pressurized vessel
1 VEGABAR 81
2 VEGABAR 81, slave sensor
4.6 Dierentialpressuremeasurement
The master/slave combination is suitable for dierential pressure
measurement
Take note of the following instructions for the measurement setup, for
example in gases:
• Mount the instruments above the measuring point
Possible condensation can then drain o into the process line.
Measurement setup

19
4 Mounting
VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
12
Fig. 9: Measurement setup for dierential pressure measurement of gases in
pipelines
1 VEGABAR 81
2 VEGABAR 81, slave sensor
4.7 Interface measurement
The master/slave combination is suitable for interface measurement
Requirements for a functioning measurement are:
• Vessel with changing level
• Products with steady density
• Interface always between the measurement points
• Total level always above the upper measurement point
The mounting distance h of the two sensors should be at least 10 %,
better 20 %, of the nal value of the sensor measuring range. A bigger
distance increases the accuracy of the interface measurement.
Measurement setup

20
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VEGABAR 81 • Slave sensor for electronic dierential pressure
45049-EN-200529
h
1,0
0,8
1
2
Fig. 10: Measurement setup with interface measurement, h = distance between
the two measuring points
1 VEGABAR 81
2 VEGABAR 81, slave sensor
The interface measurement is possible in open as well as in closed
vessels.
4.8 Density measurement
The master/slave combination is suitable for density measurement.
Requirements for a functioning measurement are:
• Vessel with changing level
• Distance between the measurement points as large as possible
• Level always above the upper measuring point
Measurement setup