Burkert 8718 User manual

Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
Type 8718 / 8719
LFC, Liquid Flow Controller
Type 8708 / 8709
LFM, Liquid Flow Meter
Type 8719
Type 8709
Type 8718
Type 8708

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous resérve de modication techniques.
© 2009 –2022 Bürkert Werke GmbH & Co. KG
Operating Instructions 2211/02_EU-ML_00805765

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Contents
1. OPERATING INSTRUCTIONS ................................................................................................................6
1.1. Symbols........................................................................................................................................6
2. AUTHORIZED USE .................................................................................................................................7
2.1. Restrictions ..................................................................................................................................7
2.2. Predictable Misuse ......................................................................................................................7
3. BASIC SAFETY INSTRUCTIONS ...........................................................................................................8
4. GENERAL INFORMATION......................................................................................................................9
4.1. Scope of Supply...........................................................................................................................9
4.2. Warranty .......................................................................................................................................9
4.3. Trademarks...................................................................................................................................9
4.4. Information on the Internet........................................................................................................10
5. SYSTEM DESCRIPTION.......................................................................................................................11
5.1. General Description ...................................................................................................................11
5.1.1. LFC, Liquid Flow Controller............................................................................................11
5.1.2. LFM, Liquid Flow Meter..................................................................................................11
5.2. Functions....................................................................................................................................11
5.2.1. Function of the LFC, Liquid Flow Controller...................................................................11
5.2.2. Function of the LFM, Liquid Flow Meter.........................................................................12
5.2.3. Function of the sensor ....................................................................................................12
5.2.4. Control electronics..........................................................................................................13
5.3. Proportional valve ......................................................................................................................15
LFC, Liquid Flow Controller Type 8718, 8719
LFM, Liquid Flow Meter Type 8708, 8709
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Type 8718, 8719 / 8708, 8709

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6. TECHNICAL DATA ................................................................................................................................16
6.1. Labels on the device..................................................................................................................16
6.1.1. Inscription on the rating plate / calibration plate ............................................................16
6.2. Operating Conditions.................................................................................................................17
6.3. Standards and directives...........................................................................................................17
6.4. Mechanical Data ........................................................................................................................18
6.5. Installation dimensions..............................................................................................................19
6.6. Fluidic Data ................................................................................................................................25
6.7. Electrical Data............................................................................................................................25
7. INSTALLATION AND START-UP...........................................................................................................27
7.1. Safety instructions .....................................................................................................................27
7.2. Procedures prior to installation.................................................................................................27
7.3. Sequence of the steps to be performed...................................................................................28
7.4. Fluid Installation.........................................................................................................................28
7.5. Electrical Installation..................................................................................................................29
7.5.1. Setting the bus address on devices without rotary switch for setting the address........30
7.5.2. Setting the bus address on devices with rotary switch for setting the address (Types
8718 / 8708)....................................................................................................................30
7.5.3. Pin assignment ...............................................................................................................31
8. OPERATION AND FUNCTION..............................................................................................................34
8.1. Safety instructions .....................................................................................................................34
8.2. OperationoftheLFC/LFM.......................................................................................................34
8.2.1. LEDs ...............................................................................................................................35
8.2.2. Inputs/Outputs................................................................................................................35
8.3. FunctionsoftheLFC/LFM.......................................................................................................38
8.3.1. Standard control mode...................................................................................................39
8.3.2. Autotune function ...........................................................................................................39
8.3.3. Safety function................................................................................................................40
8.3.4. Set-pointvalueprole.....................................................................................................40
8.3.5. Control mode..................................................................................................................40
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Type 8718, 8719 / 8708, 8709

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9. MAINTENANCE, TROUBLESHOOTING...............................................................................................41
9.1. Safety instructions .....................................................................................................................41
9.2. Maintenance Work .....................................................................................................................41
9.2.1. Maintenancewhenoperatingwithhighlysoileduids ...................................................42
9.2.2. Cleaning and recalibration at the factory........................................................................43
9.3. Malfunctions...............................................................................................................................43
10. ACCESSORIES/SPAREPARTS..........................................................................................................45
10.1. Accessories................................................................................................................................45
10.1.1. Electrical accessories .....................................................................................................45
10.1.2. Fluid accessories............................................................................................................46
10.1.3. Mass Flow Communicator (PC software) .......................................................................46
10.1.4. Documentation ...............................................................................................................47
10.2. Spare parts.................................................................................................................................47
11. SHUTDOWN .........................................................................................................................................48
11.1. Safety instructions .....................................................................................................................48
11.2. RemovaloftheLFC/LFM.........................................................................................................48
12. PACKAGING, STORAGE, TRANSPORT...............................................................................................49
12.1. Packing, Transporting................................................................................................................49
12.2. Storing ........................................................................................................................................49
13. RETURNING THE DEVICE ...................................................................................................................50
14. DISPOSAL ............................................................................................................................................51
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Type 8718, 8719 / 8708, 8709

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Operating Instructions
1. OPERATING INSTRUCTIONS
The operating instructions describe the entire life cycle of the device. Keep these instructions in a location
which is easily accessible to every user and make these instructions available to every new owner of the device.
WARNING!
The operating instructions contain important safety information!
Failure to observe these instructions may result in hazardous situations.
• The operating instructions must be read and understood.
1.1. Symbols
DANGER!
Warns of an immediate danger!
• Failure to observe the warning result in a fatal or serious injury.
WARNING!
Warns of a potentially dangerous situation!
• Failure to observe the warning may result in serious injuries or death.
CAUTION!
Warns of a possible danger!
• Failure to observe this warning may result in a medium or minor injury.
NOTE!
Warns of damage to property!
• Failure to observe the warning may result in damage to the device or the equipment.
indicates important additional information, tips and recommendations.
refers to information in these operating instructions or in other documentation.
→designates a procedure which you must carry out.
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Type 8718, 8719 / 8708, 8709

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Authorized use
2. AUTHORIZED USE
Non-authorizeduseoftheLFC/LFMTypes8718,8719/8708,8709maybeahazardtopeople,
nearby equipment and the environment.
• TheLFCTypes8718and8719aredesignedforcontrollingtheow-rateofcleanandlow-viscosity
liquids.
• TheLFMTypes8708and8709areusedexclusivelyformeasuringtheow-rateofcleanandlow-viscosity
liquids.
• Onlytheuidsstatedontheratingplateandonthecalibrationprotocolmaybeusedforoperation.
• If used outdoors, the device must be protected from the elements. Protect against humidity and direct
sunlight and observe the permitted ambient temperature.
• Duringuseobservetheauthorizeddataandoperatingconditionsspeciedinthecontractdocuments
and operating instructions, as well as the range of applications described in chapter5.1.
• Correct transportation, storage and installation, and careful use and maintenance, are essential for relia-
ble and faultless operation.
• Use the device only as intended.
2.1. Restrictions
If exporting the system/device, observe any existing restrictions.
2.2. Predictable Misuse
• TheLFC/LFMTypes8718,8719/8708,8709mustnotbeusedforcontrolling/measuringtheow-rateof
uidscontainingparticles(particlesize>20µm).
• Donotoperatethedevicewithoutthestainlesssteelmeshlterdiscinstalledatthefactory.
• Donotfeedanyotheruidsintothesystemotherthanthedesignatedoperatinguidindicatedonthe
device type plate.
Exception:Agentforcleaninganddecontaminatingthedevice(seealsochapter9.2.1).
In doing so, observe the resistance of the materials used in the device. The Chemical Resistance Chart
can be found on the Internet at:
country.burkert.com
If in doubt, contact the manufacturer.
• Do not operate the device in an mounting position which deviates from the calibration conditions.
• Do not put any loads on the housing (e.g. by placing objects on it or standing on it).
• Donotmakeanymodicationstothedevicehousings.Donotpaintthehousingpartsorscrews.
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Type 8718, 8719 / 8708, 8709

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Basic Safety Instructions
3. BASIC SAFETY INSTRUCTIONS
These safety instructions do not make allowance for any
• contingencies and events which may arise during the installation, operation and maintenance of the devices.
• local safety regulations – the operator is responsible for observing these regulations, also with reference to
the installation personnel.
Danger – high pressure!
• Beforelooseningthelinesandvalves,turnothepressureandventthelines.
Risk of electric shock!
• Beforeremovingcovers,switchothepowersupplyandsecuretopreventreactivation!
• Observeapplicableaccidentpreventionandsafetyregulationsforelectricalequipment!
Dangerfromescapingoperatinguid!
• Ifcontactismadewiththeoperatinguidanditsreactionproducts,includinginvaporform(touching,
inhaling), there is an acute risk of injury.
• Observeapplicableaccidentpreventionandsafetyregulationsfortheoperatinguidsused.
General hazardous situations.
To prevent injury, ensure that:
• The system cannot be activated unintentionally.
• Installation and repair work may be carried out by authorized technicians only and with the appropriate tools.
• Afteraninterruptioninthepowersupplyoruidsupply,ensurethattheprocessisrestartedinadened
or controlled manner.
• The device may be operated only when in perfect condition and in consideration of the operating
instructions.
• The general rules of technology apply to application planning and operation of the device.
NOTE!
Electrostaticsensitivecomponents/modules!
The device contains electronic components which react sensitively to electrostatic discharge (ESD).
Contact with electrostatically charged persons or objects is hazardous to these components. In the worst
case scenario, they will be destroyed immediately or will fail after start-up.
• Observe the requirements in accordance with EN 61340-5-1 and 5-2 to minimize or avoid the possibility
ofdamagecausedbysuddenelectrostaticdischarge!
• Alsoensurethatyoudonottouchelectroniccomponentswhenthepowersupplyvoltageispresent!
The LFC / LFM Types 8718, 8719 / 8708, 8709 were developed with due consideration given to the
accepted safety rules and are state-of-the-art. Nevertheless, dangerous situations may occur.
Failure to observe this operating manual and its operating instructions as well as unauthorized tampering
with the device, release us from any liability and also invalidate the warranty covering the devices and
accessories!
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Type 8718, 8719 / 8708, 8709

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General Information
4. GENERAL INFORMATION
4.1. Scope of Supply
Check immediately upon receipt of the delivery, that the contents are not damaged and that the type and
scope agree with the delivery note and packing list.
If there are any discrepancies, please contact us immediately.
Germany
Contact address:
Bürkert Fluid Control Systems
Sales Center
Chr.-Bürkert-Str. 13–17
D-74653Ingelngen
Tel. + 49 (0) 7940 - 10 91 111
Fax + 49 (0) 7940 - 10 91 448
E-mail: [email protected]
International
Contactaddressescanbefoundonthenalpagesoftheprintedoperatinginstructions.
And also on the internet at:
country.burkert.com
4.2. Warranty
This document contains no promise of guarantee. Please refer to our general terms of sales and delivery.
The warranty is only valid if the LFC / LFM Types 8718, 8719 / 8708, 8709 are used as intended in
accordancewiththespeciedapplicationconditions.
The warranty extends only to defects in the LFC / LFM Types 8718, 8719 / 8708, 8709 and its
components.
We accept no liability for any kind of collateral damage which could occur due to failure or mal-
function of the device.
4.3. Trademarks
The brands listed below are trademarks of the corresponding companies / associations / organisations
PROFIBUS PROFIBUS Nutzerorganisation e. V.
CANopen CiA CAN in Automation
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Type 8718, 8719 / 8708, 8709

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General Information
4.4. Information on the Internet
Operating instructions and data sheets for Types 8718, 8719, 8708 und 8709 can be found on the Internet at:
country.burkert.com
The complete documentation is also available on CD which can be ordered by quoting part no. 804 625.
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Type 8718, 8719 / 8708, 8709

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System Description
5. SYSTEM DESCRIPTION
5.1. General Description
TheLFC/LFMTypes8718,8719/8708,8709aredevicesforcontrollingormeasuringtheow-rateof
liquids in process technology.
Thedevicesarespeciedforthecontrolandmeasurementoflowow-rates.
5.1.1. LFC, Liquid Flow Controller
Theactualow-ratevaluesuppliedbytheintegratedsensoriscomparedinthedigitalcontrolelectronics
withtheset-pointow-ratevaluespecied,viaastandardsignaloreldbus.Theactualow-ratevalueis
alsoavailableasanoutput,viaastandardsignaloreldbus.
Ifthereisacontroldeviation,theactuatingvariableoutputtotheproportionalvalveismodiedviaacontrol
algorithm.Asaresult,theactualow-rateisadjustedtotheset-pointvalueandtheow-ratecanbeheldon
axedvalueorfollowapredenedprolesequence,irrespectiveofpressurechangesorotherdisturbances
in the system.
A low-friction proportional valve with a high response sensitivity is used as an actuating element.
5.1.2. LFM, Liquid Flow Meter
Theactualow-ratevaluesuppliedbytheintegratedsensorisavailableasanoutput,viaastandardsignal
oreldbus.
5.2. Functions
5.2.1. Function of the LFC, Liquid Flow Controller
TheLFCTypes8718and8719arecompactdevicesforcontrollingtheow-rateofliquids.
Theycorrectastipulatedset-pointow-ratevalueindependentlyofdisturbancevariables,suchaspressure
uctuationsoructuatingowresistance,e.g.duetoltersoiling.
The Liquid Flow Controller consists of the following components:
• Flow sensor (Q sensor),
• Control electronics (with signal processing, control and valve actuation functions),
• Proportional solenoid valve as an actuating element.
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Type 8718, 8719 / 8708, 8709

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System Description
w
p
xout
y
x
xd= w-x
Control
electronics
Q sensor Actuating element
(proportional valve)
Fig. 1: Components of the Liquid Flow Controller
Operating mode
Theset-pointdefaultvalue(w)isimplementedelectricallyviaastandardsignaloraeldbus.
The actual value (x) measured by the sensor is compared with the set-point value in the controller.
The controller supplies the actuating element with a pulse-width modulated voltage signal as an actuating
variable. The pulse-duty factor of the voltage signal is varied according to the established control deviation.
The actual value is also supplied externally as xoutviaananalogueelectricalinterfaceoraeldbusand
is available to the user for monitoring purposes or other evaluations (e.g. consumption determination by
integration).
5.2.2. Function of the LFM, Liquid Flow Meter
The LFM Types 8708 and 8709 lack the proportional valve component, compared to the corresponding LFC
Types 8718 and 8719.
Thedevicescanthereforeonlymeasuretheow-rateandnotcorrectitindependently.
The properties of the other components, in particular the sensor described below, are identical to those of
the LFC Types.
5.2.3. Function of the sensor
Theow-rateismeasuredaccordingtothedierentialpressuremethod.
Ameasuringoriceinthemainductgeneratesapressuredropinaow-ratefromp1to p2; this pressure
dropismeasuredbythedierentialpressuresensor(seeFig. 2: Flow-rate measurement; Dierential
pressure method).
Thedierentialpressuresensor,constructedfromtwoindividualpressuremeasuringcells,suppliesa
preciseandtemperature-compensatedmeasuringsignalwhichisusedtocalculatetheow-rate.
Irrespectiveofthecontrolstatus,theow-ratevaluemeasuredbythesensorissentviaastandardanalogue
signaloutputordigitallyviatheeldbus.
To maintain a dynamic or quiet actual value output signal, the damping of the output signal can be
changedwiththe"MassFlowCommunicator"software(seechapter10.1.3. Mass Flow Communi-
cator (PC software)).
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System Description
p1p2
Fig. 2: Flow-rate measurement; Dierential pressure method
Propertiesofthedierentialpressuremethod
• This measuring method has very short response times and therefore also allows very short sampling rates
by the control electronics.
• Themeasurementoccursstatically,nomovingpartsarerequiredintheuid.
5.2.4. Control electronics
Microprocessorelectronicsprocessthecurrentset-pointandactualow-ratesandcontroltheactuating
element.
The sensor signal is processed by the control electronics and is converted by the calibration curve stored in
thedeviceintoavaluecorrespondingtotheactualow-rate.
Tocontrolcriticalprocesses,wherequickow-ratechangesarenotpermitted,arampfunctioncanbe
activatedviathe"MassFlowCommunicator"software(seechapter10.1.3. Mass Flow Communicator (PC
software)).
In doing so, the parameters for an ascending and a descending set-point value can be set separately.
More detailed information on the ramp function and on all other functions can be found in the
software documentation for the LFC / LFM.
Control deviation:
Control deviation = Set-point value – Actual value
xd= w – x
The control deviation is processed according to a PI control algorithm.
The control parameters are set at the factory.
Totakeaccountofthepropertiesofthecontrolpath,thecontrolleroperateswithpath-dependentampli-
cation factors. When the autotune function runs, these are determined automatically.
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Type 8718, 8719 / 8708, 8709

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System Description
Control parameters:
The device has a stored parameter which can change the control dynamics with the aid of the "Mass Flow Com-
municator"software(seechapter10.1.3. Mass Flow Communicator (PC software)).Itsextremeeectsare
1. a very quick adjustment in which overshoots are accepted,
2. asloweradjustmenttotherequiredow-rate.
The former may result in the controller responding immediately to very low control deviations, causing the
control to be very turbulent.
Iftheprocessislessdynamic,thebehaviourofthecontrollermaybedampedsothatminoructuationsof
the actual value or set-point value are adjusted slowly.
Actuating variable:
The actuating variable is available as a pulse-width modulated (PWM) signal to the proportional valve. The
frequency of this signal is adjusted depending on the valve used.
The pulse-duty factor of the PWM signal is used as an actuating variable.
The pulse-duty factor is the quotient of the switch-on time and the cycle duration.
The greater the switch-on time, i.e. the longer the valve coil is actuated, the greater the average coil current.
Thecoilcurrentisthecauseoftheresultingmagneticeldinthecoil.
Agreatercoilcurrentresultsinagreatermagneticeld,whichincreasesthevalve'smagneticforce,which
nallymovesthevalvearmature(alsoknownasvalvecore)upagainstaspringforce.
Correction time:
An overall brief correction time is achieved by the proportional valve responding rapidly as an actuating
elementandbythebriefresponsetimeofthemeasuringelement(seechapter6.6. Fluidic Data).
Zeropointshut-o:
Toensurethesealingfunctionofthevalve,azeropointshut-oisintegrated.Thisisactivatedifthefol-
lowing conditions occur at the same time:
Set-pointvalue<10%ofnominalow-rate
Qnom and Actualvalue<10%ofnominalow-rateQnom
Ifzeropointshut-oisactive,thePWMsignalissetto0%sothatthevalveiscompletelyclosed.
The valve is a direct-acting, normally closed valve.
A return spring presses the valve armature onto the valve seat and seals it, provided the coil is not actuated,
i.e. it cannot generate a magnetic force counteracting the reset force.
Asoftseatsealintegratedinthevalvearmatureensuresthatthevalvereliablyshutsotheuidow.
Set-point value:
Theset-pointvalueisspecied,accordingtothedevicemodel,eitherasananaloguesignalviathe
standardsignalinputordigitallyviatheserialinterfaceortheeldbusinterface.
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Type 8718, 8719 / 8708, 8709

15
System Description
5.3. Proportional valve
The LFC uses direct acting, lifting-armature, proportional valves as actuating elements, taken from the
Bürkert range of valves.
The low-friction guide of the valve armature ensures (in conjunction with the PWM control) a continuous,
mainly linear characteristic, as well as high response sensitivity. Both are important for the optimum func-
tionality of the LFC closed control circuit.
Theoricesofthevalvesarebasedontherequirednominalow-rateQnom, the pressure conditions in the
applicationandthedensityoftheoperatinguid.
Aproportionalvalveisselectedbythemanufactureronthebasisofthisdata,sothattheow-ratecoef-
cientkVoftheLFC(accordingtotheow-rateequationsatthespeciedpressureconditions)allowsa
maximumow-rateofatleasttherequirednominalow-rateQnom.
Ifthedeviceisoperatedwithinthespeciedpressurerange,theproportionalvalvesimultaneously
takes over the sealing function together with the control function.
In the case of special, hard seal materials, the seal function could not be ensured. In this case an
additionalshut-ovalvemayberequired.
TheLFCorLFMistypicallycalibratedtounitswhichareusefulforlowow-ratessuchasl/horml/
min.
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Type 8718, 8719 / 8708, 8709

16
Technical Data
6. TECHNICAL DATA
CAUTION!
Riskofinjuryfrompressureanddischargeofuid.
Importantdevice-specictechnicaldataisindicatedontheratingplateandthecalibrationplate
(seechapter6.1.1. Inscription on the rating plate / calibration plate).
• Observepermitteduidaccordingtoratingplate(dependingonsealmaterial).
• Observe permitted pressure range on the calibration plate of the device.
6.1. Labels on the device
Examples:
8719 LFC WASSER
Made in Germany
00202378 W1XLP
24V DC 0-10V FKM
6,0 l/h
S/N 1006
Calibration plate
Calibration
Date 29. 01. 2009
Pressure 2.0bar
Horizontal mounting position
Rating plate
8719 LFC WASSER
Made in Germany
00202378
W1XLP
24V DC 0-10V
6,0 l/h
S/N 1006
Fig. 3: Rating plate, calibration plate
6.1.1. Inscription on the rating plate / calibration plate
Example of rating plate
8719 LFC WASSER
Made in Germany
00202378 W1XLP
24V DC 0-10V FKM
6,0 l/h
S/N 1006
Type
Brief description of the device
Operatinguid
Final value (Qnom) and unit
Power supply voltage, actual value
Seal material
Serialnumber,CEidentication
Bar code
Identicationnumberofthedevice
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Type 8718, 8719 / 8708, 8709

17
Technical Data
Example of calibration plate
Calibration
Date 28. 01. 2009
Pressure 2.0bar
Horizontal mounting position
Calibration date
Calibration pressure
Mounting position
6.2. Operating Conditions
WARNING!
Riskofinjuryfrommalfunctionduetoeectsofweather!
The LFC / LFM is not designed for unrestricted use outdoors.
If the device is not protected from the elements, there is a risk of injury from the device failing.
• Protect the device from direct sunlight.
• Ensure that the ambient temperature permitted for the device is observed.
• Protect the device from humidity in consideration of the protection class indicated below.
Allowable temperatures
Ambienttemperature:    Operation: 0...+55°C
Storage: -10...+70°C
Fluidtemperature:     +10...+40°C
Permittedairhumidity:    0...95%,withoutcondensation
Operatinguids:      cleanandlow-viscosityliquids
Protection class in
accordance with DIN EN 60529: Types 8709 and 8719: IP65 (only if cables, plugs and sockets have been
connected correctly)
Types 8708 and 8718: IP40
6.3. Standards and directives
CE mark conforms to EMC Directive 2004/108/EEC (previously: 89/336/EEC)
(only if cables, plugs and sockets have been connected correctly).
The device complies with the relevant EU harmonisation legislation. In addition, the device also complies
with the requirements of the laws of the United Kingdom.
The harmonised standards that have been applied for the conformity assessment procedure are listed in the
current version of the EU Declaration of Conformity/UK Declaration of Conformity.
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Type 8718, 8719 / 8708, 8709

18
Technical Data
6.4. Mechanical Data
Mounting position: horizontal or vertical
(see calibriation plate / calibration protocol)
Material: Housing: Types 8709 and 8719: Stainless steel 1.4404
Types 8708 and 8718: Stainless steel 1.4404
Cover: Types 8709 and 8719: PTB
Types 8708 and 8718: PC
Sealing material FKM, EPDM, FFKM (see rating plate)
Weight: Types 8709 and 8719: approx. 1200 g (stainless steel)
Types 8708 and 8718: approx. 1000 g (stainless steel)
Dimensions:
(LxHxW)     Types8709and8719:115mmx137.5mmx37mm
Types8708and8718:107mmx115.5mmx28mm
Types8708and8718withangedconnection:107mmx115.5mmx43mm
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Type 8718, 8719 / 8708, 8709

19
Technical Data
6.5. Installation dimensions
LFC Type 8719 and LFM Type 8709:
M4 - 8 deep
A
A
71
10
97
23
42
M4 - 8 deep
4
10
12.5
37
115
Dimension A
G 1/4 G 1/8
NPT 1/4 NPT 1/8
137.5
Fig. 4: Installation dimensions LFC Type 8719 and LFM Type 8709
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Type 8718, 8719 / 8708, 8709

20
Technical Data
LFCType8719andLFMType8709,eldbusversion:
Dimension A
G 1/4 G 1/8
NPT 1/4 NPT 1/8
M4 - 8 deep
A
A
71
10
137.5
97
23
42
M4 - 8 deep
4
10
12.5
37
115
112
16.5
Fig. 5: Installation dimensions LFC Type 8719 and LFM Type 8709, eld bus version
english
Type 8718, 8719 / 8708, 8709