Burkert 8756 User manual

Type 8756
büS / CANopen - Analogue
Mass Flow Meter / Mass Flow Controller for liquids
Operating Instructions

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© Bürkert SAS, 2020 - 2021
Operating Instructions 2107/02_EU-en 00573797 / Original EN

Type 8756
Table of contents
english 3
TABLE OF CONTENTS
1 About this document ............................................................. 5
1.1 Manufacturer..................................................................5
1.2 Used symbols ................................................................5
1.3 Terms and abbreviations ...............................................5
2 Safety instructions ................................................................. 6
2.1 Warranty.........................................................................6
2.2 Intended use ..................................................................6
2.3 General safety information.............................................7
3 Product description ............................................................... 8
3.1 Design ............................................................................8
3.2 Product status indicator...............................................12
3.3 Markings ......................................................................14
3.4 Memory card................................................................ 15
3.5 Actuator is a pump.......................................................15
3.6 Actuator is a control valve............................................ 16
3.7 Customised actuator.................................................... 16
4 Technical data...................................................................... 17
4.1 Conformity ...................................................................17
4.2 Operating conditions.................................................... 17
4.3 Product materials .........................................................19
4.4 Dimensions, weight ......................................................20
4.5 Fluid data......................................................................20
4.6 Electrical data ...............................................................29
5 Fluid connection ....................................................................33
5.1 Safety instructions........................................................33
5.2 Installation steps...........................................................35
5.3 Installation procedure...................................................35
6 Electrical connection.............................................................37
6.1 Safety instructions........................................................37
6.2 Additional documentation.............................................37
6.3 Wire the product variant büS /CANopen......................38
6.4 Wire the product variant Analogue...............................40
6.5 Connect the functional earth ........................................44
6.6 Connect the external actuator (MFC for modular actu-
ator)...............................................................................44
7 Commissioning ......................................................................45
7.1 Safety instructions........................................................45
7.2 Commissioning procedure (MFM) ................................46
7.3 Commissioning procedure (MFC with pump)...............46

Type 8756
Table of contents
english
4
7.4 Commissioning procedure (MFC with proportional valve)
.....................................................................................47
7.5 Commissioning procedure (MFC for modular actuator)
.....................................................................................48
8 Setting and operation .......................................................... 49
8.1 Safety instructions .......................................................49
8.2 Functions .....................................................................50
8.3 Tools for doing the settings ......................................... 53
8.4 Connect the product to the Bürkert Communicator soft-
ware .............................................................................53
8.5 Settings specific to the product variant büS/CANopen
.....................................................................................55
8.6 Operating modes of an MFC .......................................56
8.7 Normal operating mode (MFC) ....................................57
8.8 Optimise the closed-loop control parameters (MFC)... 59
8.9 Choose the source that gives the set-point value (MFC)
.....................................................................................60
8.10 Set-point values without communication (MFC büS/
CANopen).....................................................................61
9 Maintenance......................................................................... 61
9.1 Safety instructions .......................................................61
9.2 Replace the memory card............................................ 62
9.3 Sterilising a product variant MFM with hot water.........63
9.4 Sterilising a product variant MFM with steam ..............63
10 Troubleshooting.....................................................................64
10.1 Problems shown by the product status indicator.........64
10.2 Miscellaneous problems...............................................73
11 Spare parts and accessories ................................................81
11.1 Electrical accessories ...................................................81
11.2 Additional software.......................................................82
12 Uninstallation .........................................................................83
12.1 Safety instructions........................................................83
12.2 Dismantling...................................................................83
13 Logistic...................................................................................84
13.1 Transport ......................................................................84
13.2 Storage .........................................................................85
13.3 Return ...........................................................................85
13.4 Disposal........................................................................85

Type 8756
About this document
english 5
1 ABOUT THIS DOCUMENT
The document is an important part of the product and guides the
user to safe installation and operation. The information and in-
structions in this document are binding for the use of the product.
▪Before using the product for the first time, read and observe the
whole safety chapter.
▪Before starting any work on the product, read and observe the
respective sections of the document.
▪Keep the document available for reference and give it to the
next user.
▪Contact the Bürkert sales office for any questions.
Further information concerning the product at
country.burkert.com.
1.1 Manufacturer
Bürkert Fluid Control Systems
Christian-Bürkert-Str. 13−17
D-74653 Ingelfingen
The contact addresses are available at
country.burkert.com in the Contact menu.
1.2 Used symbols
DANGER!
Warns of a danger that leads to death or serious injuries.
WARNING!
Warns of a danger that can lead to death or serious injuries.
CAUTION!
Warns of a danger that can lead to minor injuries.
ATTENTION!
Warns of property damage that can damage the product or
the installation.
Indicates important additional information, tips and recom-
mendations.
Refers to information in this document or in other docu-
ments.
Indicates an instruction to avoid a danger.
Indicates a step to be carried out.
Indicates a result.
Menu Indicates a software user-interface text.
1.3 Terms and abbreviations
The terms and abbreviations are used in this document to refer to
following definitions.

Type 8756
Safety instructions
english
6
Product Type 8756
▪Mass Flow Meter (MFM) büS/CANopen
▪Mass Flow Meter (MFM) Analogue
▪Mass Flow Controller (MFC) büS/CANopen with
pump
▪Mass Flow Controller (MFC) Analogue with pump
▪Mass Flow Controller (MFC) büS/CANopen with
proportional valve
▪Mass Flow Controller (MFC) Analogue with pro-
portional valve
▪Mass Flow Controller (MFC) büS/CANopen with
an interface for a modular actuator
▪Mass Flow Controller (MFC) Analogue with an in-
terface for a modular actuator
büS Bürkert system bus, a communication bus de-
veloped by Bürkert and based on the CANopen
protocol
NAMUR Standards committee for measurement and control
technology (NAMUR) is an international association
of users of automation systems for the process in-
dustry.
NAMUR re-
commend-
ation
(NE)107
Self-monitoring and diagnosis of field devices.
2 SAFETY INSTRUCTIONS
2.1 Warranty
The warranty is conditional on compliant use of the product in
observance of the operating conditions.
2.2 Intended use
Improper use of the product may be a hazard to people, nearby
equipment and the environment.
MFM Type8756 is used exclusively to measure the mass
flow rate of liquids.
MFC Type8756 is used exclusively to measure and regu-
late the mass flow rate of liquids.
Observe the data (additional data, operating conditions, ser-
vice conditions) in the contract documents, in the Operating
Instructions, on the type label and on the calibration label.
Only use the product indoors.
Only use the product up to an altitude of 2000m.
Only use the product with external instruments that the
product manufacturer recommends.
Only use the product with components that the product manu-
facturer recommends.
Operate the product carefully and ensure regular and profes-
sional maintenance.
Operate the product only in perfect working order. Ensure ap-
propriate storage, transport, installation and use.

Type 8756
Safety instructions
english 7
Only use the product for its intended purpose.
2.3 General safety information
The safety instructions do not take into account any contingen-
cies or occurrences that may arise during installation, use and
maintenance of the product. The operating company is respons-
ible for the respect of the local safety regulations including for the
personnel safety.
DANGER!
Risk of injury that is due to pressure in the installation or in the
product.
▶Before working on the installation or product, cut the pres-
sure. Vent and drain the pipes.
DANGER!
Risk of injury from electric shocks.
▶Before working on the installation or product, switch off the
power supply. Make sure that nobody can switch the power
supply on.
▶Observe all applicable accident protection and all applicable
safety regulations for electrical equipment.
DANGER!
Burn hazard and fire hazard that are due to hot surface of the
product.
▶Do not touch the hot surface with bare hands.
▶Wear safety gloves to touch the product.
▶Keep the product away from any highly flammable materials
or fluids.
WARNING!
Risk of injury that is due to escape of the fluid.
Contact with the operating fluid, its reaction products and va-
pours can cause injuries.
Inhaled vapours can be harmful.
▶Observe all applicable accident protection and all applicable
safety regulations relating to the operating fluid used.
To avoid personal injury, obey the following instructions:
Only operate the product with a filtered fluid.
Make sure that the operating pressure of the product is not
higher than the maximum authorized operating pressure. Refer
to the data sheet of the product on our homepage:
country.burkert.com.
Only use the product for fluids that are compatible with the
product materials.
Do not make any modifications to the product and do not sub-
ject the product to mechanical stress.

Type 8756
Product description
english
8
Protect the installation and the product from accidental actu-
ation.
Only trained personnel may perform the installation work and
the maintenance work.
After an interruption in the electrical supply or in the fluid sup-
ply, ensure a controlled restart of the process.
Observe best industry practice.
ATTENTION!
Components or assemblies at risk from electrostatic charges.
The product contains electronic components which are subject
to electrostatic discharge (ESD). Contact with electrostatically
charged persons or objects endangers these components. In
the worst case, they could be defective immediately or might fail
when energised.
▶To minimise or even avoid any damage caused by an electro-
static discharge, take all the precautions described in the EN
61340-5-1.
▶Do not touch any of the live electrical components.
3 PRODUCT DESCRIPTION
3.1 Design
3.1.1 Mass Flow Meter
1
2
3
45
6
789
10
11
12 13
Fig.1: Product variants of the MFM
1 Product variant Analogue: electrical connection, 5-pin M12
female connector, A coding

Type 8756
Product description
english 9
1 Product variant büS/CANopen: not used
2 Electrical connection, 5-pin M12 male connector, A coding
3 Possible fluid connections:
▪G-internal-threaded fluid connections according to DIN
ISO228/1
▪NPT-internal-threaded fluid connections according to
ASME/ ANSI B 1.20.1
▪fluid connections with external-threaded vacuum fittings
▪fluid connections with external-threaded compression fit-
tings
4 M4 screw for functional earth connection
5 Base block
6 Product status indicator. The indicator operates according
to NAMUR NE107.
7 Not used
8 Not used
9 Not used
10 M3 hexalobular internal screw
11 Cover
12 büS-interface for Bürkert Communicator software
13 Slot for the memory card
3.1.2 Mass Flow Controller with pump
1
2
3
45
6
7
8
9
10
11
12
13 14
Fig.2: Product variants of the MFC with pump
1 Product variant Analogue: electrical connection, 5-pin M12
female connector, A coding
1 Product variant büS/CANopen: not used

Type 8756
Product description
english
10
2 Electrical connection, 5-pin M12 male connector, A coding
3 Possible fluid connections:
▪G-internal-threaded fluid connections according to DIN
ISO228/1
▪NPT-internal-threaded fluid connections according to
ASME/ ANSI B 1.20.1
▪fluid connections with external-threaded vacuum fittings
▪fluid connections with external-threaded compression fit-
tings
4 M4 screw for functional earth connection
5 Base block
6 Pump
7 Product status indicator. The indicator operates according
to NAMUR NE107.
8 Not used
9 Not used
10 Not used
11 M3 hexalobular internal screw
12 Cover
13 büS-interface for Bürkert Communicator software
14 Slot for the memory card
3.1.3 Mass Flow Controller with proportional
valve
1
2
3
45
6
7
8
9
10
11
12
13 14
Fig.3: Product variants of the MFC with proportional valve
1 Product variant Analogue: electrical connection, 5-pin M12
female connector, A coding
1 Product variant büS/CANopen: not used

Type 8756
Product description
english 11
2 Electrical connection, 5-pin M12 male connector, A coding
3 Possible fluid connections:
▪G-internal-threaded fluid connections according to DIN
ISO228/1
▪NPT-internal-threaded fluid connections according to
ASME/ ANSI B 1.20.1
▪fluid connections with external-threaded vacuum fittings
▪fluid connections with external-threaded compression fit-
tings
4 M4 screw for functional earth connection
5 Base block
6 Proportional valve
7 Product status indicator. The indicator operates according
to NAMUR NE107.
8 Not used
9 Not used
10 Not used
11 M3 hexalobular internal screw
12 Cover
13 büS-interface for Bürkert Communicator software
14 Slot for the memory card
3.1.4 Mass Flow Controller for modular
actuator
1
2
3
45
6
7
8
9
10
11
12
13 14
Fig.4: Product variants of the MFC for modular actuator
1 Product variant Analogue: electrical connection, 5-pin M12
female connector, A coding
1 Product variant büS/CANopen: not used

Type 8756
Product description
english
12
2 Electrical connection, 5-pin M12 male connector, A coding
3 Possible fluid connections:
▪G-internal-threaded fluid connections according to DIN
ISO228/1
▪NPT-internal-threaded fluid connections according to
ASME/ ANSI B 1.20.1
▪fluid connections with external-threaded vacuum fittings
▪fluid connections with external-threaded compression fit-
tings
4 M4 screw for functional earth connection
5 Base block
6 8-pin M12 female connector for the connection of the actu-
ator
7 Product status indicator. The indicator operates according
to NAMUR NE107.
8 Not used
9 Not used
10 Not used
11 M3 hexalobular internal screw
12 Cover
13 büS-interface for Bürkert Communicator software
14 Slot for the memory card
3.2 Product status indicator
The product status indicator changes its colour based on the
NAMUR recommendation NE107 .
The colour of the product status indicator gives the following
pieces of information:
▪Whether product diagnostics are active or not. Diagnostics are
active on the product and cannot be deactivated.
▪If product diagnostics are active, then the product status indic-
ator shows whether diagnostics events have been generated or
not. If several diagnostics events have been generated, then
the product status indicator shows the diagnostics event with
the highest priority. Refer to table [}12]
If the product status indicator flashes, then the product is selec-
ted in a man-machine interface such as the Bürkert Communic-
ator software.
Colour 1Colour
code (for a
PLC)
Diagnostics event 2
Red 5 Failure, error or fault
Due to a malfunction of the product or its periphery.
▪MFM: The measured values are not valid.
▪MFC: The measured values are not valid and the
product cannot regulate any more.

Type 8756
Product description
english 13
Colour 1Colour
code (for a
PLC)
Diagnostics event 2
Orange 4 Check function
The product is being worked on.
▪MFM: The output signal is temporarily invalid.
▪MFC: The product cannot regulate temporarily.
Yellow 3 Out of specification
The ambient conditions or process conditions for
the product are outside the specified ranges.
Product internal diagnostics point to problems in
the product or with the process properties.
Blue 2 Maintenance required
Do the required maintenance operation.
▪MFM: The product continues to measure.
▪MFC: The product continues to regulate, but a
function is temporarily restricted.
Colour 1Colour
code (for a
PLC)
Diagnostics event 2
Green 1 -
Diagnostics are active and no diagnostics event
has been generated.
▪MFC: The product operates in the normal operat-
ing mode or in Stored set-point value operating
mode. Refer to chapter: Normal operating mode
(MFC) [}57] and Choose the source that gives
the set-point value (MFC) [}60].
Tab.1: Product status indicator in accordance with NAMUR
NE107, edition 2006-06-12, for active diagnostics
To solve a problem indicated by the product status indicator,
refer to chapter: Troubleshooting [}64]
1 according to NE107
2 according to NE 107

Type 8756
Product description
english
14
3.3 Markings
3.3.1 Calibration label
4
5
2
1Mass Flow
Flow Direction
Pmax: 16 bar
Id: 00******
QC passed: __ . __ . ____
3
Fig.5: Description of the calibration label
1 Product variant
2 Flow direction. The flow direction depends on the product
variant.
3 Maximum fluid pressure
4 Product article-number
5 Manufacturing date
3.3.2 Type label
8756 24V ... 4W [4W]
IP65 NEC Class 2 only
25.0 kg/h H2O
büS/CANopen
Ta= –10°C...+60°C
S/N 1000 W41ME PS=100barg VAAg
00******
1 2 3
8910
11
12
13
14
15
4
5
6
7
Fig.6: Description of the type label (example)
1 Type of the product
2 Supply voltage, direct current
3 Consumption according to UL 61010-1 [typical consump-
tion 3
4 For UL-certified products, only use limited power circuits of
"NEC Class 2".
5 Warning symbol: Observe the Operating Instructions de-
livered with the product.
6 Calibration fluid
7 Sealing material
8 Burst pressure
9 Manufacturing code
3 Conditions: ambient temperature 23°C, nominal flow rate 100%

Type 8756
Product description
english 15
10 Product article number
11 Product serial number
12 Ambient temperature
13 Product variant büS /CANopen: communication interface
13 Product variant Analogue: input and output
14 Nominal mass flow rate (Q nominal)
15 IP-Code
3.3.3 Conformity marking
D-74653 Ingelfingen
Made in Germany
Conformity
marking
Fig.7: CE marking
3.4 Memory card
If the memory card is defective or lost, then buy a new
memory card from your Bürkert sales office.
The product is delivered with a memory card that is inserted in
the product.
When the product is energised, there are two possibilities:
▪If product-specific data is stored on the inserted memory card,
then the product adopts the data. At product delivery, the
memory card contains product-specific data. To get a list of the
stored data, refer to the Help for the Initiation file that can be
downloaded from country.burkert.com.
▪If the inserted memory card is empty, then the product loads its
own data on the memory card. A new memory card is empty.
The data on the memory card can be transferred to another
product with the same article number. For example, the data can
be transferred from a defective product to a new product.
3.5 Actuator is a pump
The pump is a micro-annular gear pump.
ATTENTION!
The micro-annular gear pump is not completely tight.
▶To avoid possible problems that are due to leakage, make
sure that no fluid flows when the pump is switched off. Take
into account the static pressure.
ATTENTION!
Risk of damage to the pump due to the suction pressure.
▶The suction pressure must be as low as possible and always
lower than 200 mbar.
The service life of the pump is approximately 8,000...10,000
hours. The value depends on the following criteria:
▪the dry cycle time of the pump

Type 8756
Product description
english
16
▪the pump speed
▪the fluid used
▪the back pressure
3.6 Actuator is a control valve
The control valve is a direct-acting and normally-closed propor-
tional valve.
The control valve provides the sealing function when the following
conditions are met:
▪The product is used within the specified pressure range.
▪The product is equipped with a valve seat seal that is made of a
soft material such as FKM, FFKM or EPDM.
If the valve seat seal is made of a hard material such as
PCTFE, then the control valve may not be tight.
Products with a nominal valve diameter of 0.05mm or
0.1mm have a valve seat seal made of a hard material.
3.7 Customised actuator
An MFC for modular actuator can be combined to the following
actuators:
▪a proportional valve
▪a pump
When selecting the actuator, observe the following basic data of
the MFC for modular actuator:
▪nominal flow rate
▪inlet pressure
▪...

Type 8756
Technical data
english 17
4 TECHNICAL DATA
4.1 Conformity
The product complies with the EU directives according to the EU
declaration of conformity (if applicable).
The applied standards, which verify conformity with the EU dir-
ectives, can be found on the EU type examination certificate and/
or the EU declaration of conformity (if applicable).
4.2 Operating conditions
WARNING!
Risk of injury caused by pressure, fluid escape.
▶Do not exceed the maximum operating pressure. The value of
the operating pressure is given in the product data sheet.
CAUTION!
Risk of injury from malfunction that is due to outdoor use.
▶Do not use the product in outdoor areas.
4.2.1 Mass Flow Meter
Ambient temperat-
ure
0 °C...+50 °C
Fluid temperature –10 °C...+70 °C, only in liquid state
Ambient humidity < 95%, non-condensing
IP-Code according
to EN 60529
IP65 4
If the following conditions are met:
▪Cables must be connected.
▪Mating connectors must be plugged in and
tightened.
Tab.2: Operating conditions of an MFM
Fluid connections Seal material Operating
pressure
▪G-internal-threaded fluid con-
nections according to DIN
ISO228/1
▪NPT-internal-threaded fluid
connections according to
ASME/ ANSI B 1.20.1
▪FFKM
▪PCTFE
max.100bar
▪G-internal-threaded fluid con-
nections according to DIN
ISO228/1
▪NPT-internal-threaded fluid
connections according to
ASME/ ANSI B 1.20.1
metal max.50bar
4 The IP-Code is determined by Bürkert. The IP-Code is not evaluated by UL.

Type 8756
Technical data
english
18
Fluid connections Seal material Operating
pressure
▪Fluid connections with ex-
ternal-threaded vacuum fit-
tings
▪Fluid connections with ex-
ternal-threaded compression
fittings
▪metal
▪FFKM
▪PCTFE
max.50bar
Tab.3: Maximum operating pressure
4.2.2 Mass Flow Controller with pump
Ambient temperat-
ure
0 °C...+50 °C
Fluid temperature –10 °C...+60 °C, only in liquid state
Ambient humidity < 95%, non-condensing
IP-Code according
to EN 60529
IP40 5
If the following conditions are met:
▪Cables must be connected.
▪Mating connectors must be plugged in and
tightened.
Operating pressure
▪Inlet pressure ▪0 bar
▪Outlet pressure ▪max.10 bar
Tab.4: Operating conditions of an MFC with pump
4.2.3 Mass Flow Controller with proportional
valve
Ambient temperat-
ure
0 °C...+50 °C
Fluid temperature –10 °C...+60 °C, only in liquid state
Ambient humidity < 95%, non-condensing
IP-Code according
to EN 60529
IP65 6
If the following conditions are met:
▪Cables must be connected.
▪Mating connectors must be plugged in and
tightened.
Operating pressure
▪Inlet pressure ▪max.5 bar
Tab.5: Operating conditions of an MFC with proportional valve
4.2.4 Mass Flow Controller for modular
actuator
Ambient temperat-
ure
0 °C...+50 °C
Fluid temperature –10 °C...+70 °C, only in liquid state
5 The IP-Code is determined by Bürkert. The IP-Code is not evaluated by UL.
6 The IP-Code is determined by Bürkert. The IP-Code is not evaluated by UL.

Type 8756
Technical data
english 19
Ambient humidity < 95%, non-condensing
IP-Code according
to EN 60529
IP657
If the following conditions are met:
▪Cables must be connected.
▪Mating connectors must be plugged in and
tightened.
Tab.6: Operating conditions of an MFC for modular actuator
Fluid connections Seal material Operating
pressure
▪G-internal-threaded fluid con-
nections according to DIN
ISO228/1
▪NPT-internal-threaded fluid
connections according to
ASME/ ANSI B 1.20.1
▪FFKM
▪PCTFE
max.100bar
▪G-internal-threaded fluid con-
nections according to DIN
ISO228/1
▪NPT-internal-threaded fluid
connections according to
ASME/ ANSI B 1.20.1
metal max.50bar
Fluid connections Seal material Operating
pressure
▪Fluid connections with ex-
ternal-threaded vacuum fit-
tings
▪Fluid connections with ex-
ternal-threaded compression
fittings
▪metal
▪FFKM
▪PCTFE
max.50bar
Tab.7: Maximum operating pressure
4.3 Product materials
Product part Material
Base block Stainless steel 316L
Housing Painted aluminium, stainless steel
Seal Refer to the type label
Product status in-
dicator
Polycarbonate
Parts in contact
with the fluid
(sensor)
stainless steel 1.4404
Parts in contact
with the fluid
(MFC)
Carbide, epoxy-resin adhesive
7 The IP-Code is determined by Bürkert. The IP-Code is not evaluated by UL.

Type 8756
Technical data
english
20
Product part Material
Parts in contact
with the fluid (MFC
with proportional
valve)
Stainless steel 303, stainless steel 434, stain-
less steel 301
The material depends on the equipped pro-
portional valve
Tab.8: Product materials
4.4 Dimensions, weight
Refer to the data sheet of the related product.
4.5 Fluid data
4.5.1 Mass Flow Meter
Calibration fluid Water
Temperature of the calibration
fluid
25°C
Calibration pressure 4bar
Tab.9: Calibration conditions
Operating fluid Liquids
Type of liquids Liquids that are clean and ho-
mogeneous
Maximum particle size 10μm
Minimum dynamic viscosity 0.3mPa.s
Maximum dynamic viscosity 200mPa.s
Take the pressure loss into ac-
count. Refer to chapter: Pres-
sure loss of an MFM [}21]
Tab.10: Operating fluid
Density range 0...5kg/l
Measurement accuracy for
mass flow rate values higher
than 1.5kg/h
±0.01kg/l
Repeatability for mass flow rate
values higher than 1.5kg/h
±0.005kg/l
Tab.11: Density measurement
Temperature range –10...70°C
Measurement accuracy for
mass flow rate values higher
than 1.5kg/h
±1.0°C
Repeatability for mass flow rate
values higher than 1.5kg/h
±0.5°C
Tab.12: Temperature measurement
Mass flow rate range 0.05...25kg/h
Measurement accuracy after
1minute warm-up time
±0.2% of the measured value
PLUS ±0.0014kg/h.
0.0014kg/h = zero-point stabil-
ity