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Type 8741
Multi MFC
Mass Flow Meter (MFM) / Mass Flow Controller (MFC)
Massendurchflussmesser (MFM) / Massendurchflussregler (MFC)
Débitmètre massique (MFM) / Régulateur de débit massique (MFC)
Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
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We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© Bürkert SAS, 2014
Operating Instructions 1403/00_EU-ML_00810383 / Original DE
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Type 8741
Table of content
1 USER INSTRUCTIONS ..............................................................................5
1.1 Definition of the word "device" ...............................................5
1.2 Symbols used .............................................................................5
2 INTENDED USE .............................................................................................6
2.1 Restrictions ................................................................................. 6
3 BASIC SAFETY INFORMATION ............................................................7
4 GENERAL INFORMATION ........................................................................8
4.1 Manufacturer's address and international contacts...........8
4.2 Warranty ...................................................................................... 8
4.3 Information on the Internet ......................................................8
5 SYSTEM DESCRIPTION ............................................................................9
5.1 Design of the MFM/MFC ......................................................... 9
5.2 General description ..................................................................9
5.3 Operation of the MFM (Mass Flow Meter) .......................... 9
5.4 Operation of the MFC (Mass Flow Controller) .................10
5.5 Operation of the sensor in the MFM/MFC ........................12
6 TECHNICAL DATA .....................................................................................13
6.1 Conformity .................................................................................13
6.2 Standards ..................................................................................13
6.3 Operating conditions ..............................................................13
6.4 Mechanical data.......................................................................14
6.5 Fluid data ...................................................................................14
6.6 Electrical data ...........................................................................15
6.7 Nameplate, calibration plate .................................................16
7 INSTALLATION ............................................................................................ 17
7.1 Safety instructions ...................................................................17
7.2 Before installation ....................................................................17
7.3 Mechanical installation ...........................................................17
7.4 Fluid system installation .........................................................18
7.5 Setting up the fieldbuses.......................................................20
7.6 Electrical installation ...............................................................20
7.7 Connecting the functional earth...........................................22
8 COMMISSIONING ..................................................................................... 23
8.1 Safety instructions ...................................................................23
9 OPERATION AND FUNCTION .............................................................23
9.1 Safety instructions ...................................................................23
9.2 Normal control mode ..............................................................23
9.3 Device status LED ...................................................................24
9.4 Setting up the fieldbuses.......................................................25
9.5 Removable data memory .......................................................26
9.6 Functions ...................................................................................27
10 MAINTENANCE ........................................................................................... 30
10.1 Maintenance for operation with heavily contaminated
media ..........................................................................................30
10.2 Cleaning and recalibration at the factory ...........................31
11 DEVICE STATUS/TROUBLESHOOTING ....................................... 32
11.1 Display of the device status .................................................32
11.2 Troubleshooting .......................................................................35
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12 ACCESSORIES /SPARE PARTS ....................................................... 37
12.1 Electrical Accessories ............................................................37
12.2 Fluid accessories .....................................................................37
12.3 Bürkert Communicator (PC software) ................................38
12.4 Additional documentation ......................................................38
12.5 Spare parts ...............................................................................38
13 DISMANTLING ............................................................................................39
13.1 Safety instructions ...................................................................39
14 TRANSPORT, STORAGE, DISPOSAL .............................................. 40
15 RETURNING THE DEVICE .................................................................... 40
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Type 8741
User instructions
1 USER INSTRUCTIONS
This manual describes the entire life cycle of the device. Please keep
this manual in a safe place, accessible to all users and any new owners.
Important safety information!
Please read the manual carefully. Pay particular attention to the
sections entitled Basic safety information and Intended use.
▶ This operating manual must be read and understood.
1.1 Definition of the word "device"
The word "device" as used within this manual, always refers to the
MFM/MFC Type 8741.
1.2 Symbols used
The following symbols are used in these instructions.
Danger!
Warns of immediate danger!
▶ If ignored, death or serious injury will result.
Warning!
Warns of a situation which is possibly dangerous!
▶ If ignored, serious injury or death may result.
Caution!
Warns of possible danger!
▶ Failure to observe this warning can result in substantial or minor
injuries.
note!
Warns of damage to property!
Important advice and recommendations
refers to information in this operating manual, or in other
documents.
→ Indicates a procedure that must be carried out.
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Type 8741
Intended use
2 INTENDED USE
Improper use of the MFC/MFM may be a hazard to people,
nearby equipment and the environment.
MFM type 8741 is used exclusively to measure the mass flow
of clean dry gases.
MFC type 8741 is used exclusively to control the mass flow of
clean dry gases.
▶ Observe the additional data, operating and service conditions
specified in the contract documents, the manual and on the
nameplate and calibration plate.
The device
▶ Use only for the media indicated on the nameplate and in the
calibration protocol.
▶ Do not use in an outdoor area.
▶ Use only in conjunction with external devices and components
recommended by Bürkert.
▶ Operate carefully and ensure regular, professional maintenance.
▶ Operate only in perfect working order and ensure appropriate
storage, transport, installation and control.
▶ Use only for its intended purpose.
2.1 Restrictions
When operating the device, observe any applicable restrictions.
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Type 8741
Basic safety information
3 BASIC SAFETY INFORMATION
These safety instructions do not take the following into account:
• any contingencies or occurrences that may arise during installation,
use and maintenance.
• Location-specific safety regulations, adherence to which, also on the
part of the mounting personnel, is the responsibility of the operator.
Danger due to high pressure in the installation/device.
▶ Before working on the installation or device, cut the pressure
and vent and drain the pipes.
Risk of injury from electric shocks.
▶ Before working on the installation or device, switch off the
power and ensure that it cannot be reactivated.
▶ Observe the applicable accident protection and safety regula-
tions for electrical equipment!
Burns/fire hazard due to hot surface of the device!
▶ Keep the device away from any highly flammable materials or
media and avoid any contact with bare hands.
Danger due to escape of the medium
▶ Observe the applicable accident protection and safety regula-
tions relating to the operating medium used.
Various dangerous situations.
To avoid personal injury, take care:
▶ Not to operate the device without the factory installed input
filters.
▶ Only to operate the device in the installation position given on
the calibration plate.
▶ That the operating pressure of the device is not higher than the
maximum calibration pressure (MFM) specified on the calibration plate or the tightness pressure of the proportional valve
(MFC).
▶ To only use the device for the medium specified as the operat-
ing medium in the calibration protocol.
▶ Only to use agents that are stable with the device materials for
cleaning and decontamination
The compatibility chart can be found on our homepage:
www.burkert.com
in the event of any ambiguity please contact your local sales
office.
▶ Do not make any internal or external modifications to the device
and do not subject it to mechanical loads.
▶ Protect the installation/device from accidental actuation.
▶ Only trained personnel may perform installation and mainte-
nance work.
▶ After an interruption in the electrical and media supply, ensure a
controlled restart of the process.
▶ Observe best industry practice.
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Type 8741
General information
note!
Components / assemblies at risk from electrostatic charges!
The device contains electronic components which are susceptible to
electrostatic discharge (ESD). Contact with electrostatically charged
persons or objects endangers these components. In the worst case,
they will become defective immediately or will fail when energized.
• To minimise or even avoid all damage due to an electrostatic
discharge, take all the precautions described in the EN 613405-1.
• Do not touch any of the live electrical components.
4 GENERAL INFORMATION
4.1 Manufacturer's address and international contacts
The manufacturer of the device can be contacted at the following
address:
Bürkert SAS
Rue du Giessen
F-67220 TRIEMBACH-AU VAL
The addresses of our international sales offices are available on the internet at:
www.burkert.com
4.2 Warranty
The warranty is conditional on compliant use of the MFM/MFC type
8741 in observance of the operating conditions specified
in this manual.
4.3 Information on the Internet
Operating manuals and data sheets regarding type 8741 can be found
online under: www.burkert.com
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Type 8741
System description
5 SYSTEM DESCRIPTION
5.1 Design of the MFM/MFC
Connector*
for electrical connection
(4-pin screw terminals)
Micro
SIM card
Setting
fieldbus
Functional earth connection:
M3 screw**
M4 screw**
Fluid connection
Flow direction
* The removable connector is part of the device
** For cable shielding and earthing of the device
Fig. 1 : Design of MFM/MFC Type 8741
LED to display the
device status (in
accordance with
Namur 107)
5.2 General description
Device Type 8741 is available in two basic versions.
• As a Mass Flow Meter (MFM) the device measures the mass flow
of the gases for which it has been calibrated.
• As a Mass Flow Controller (MFC) the device measures and con-
trols the mass flow of the gases for which it has been calibrated.
In contrast to the MFM, the MFC also contains a regulation valve.
The gas must be in a dry and clean state.
Digital communication with the device (for example for transfer of the
setpoint or measured value) is achieved via CANopen*- or büS**.
* CANopen - A fieldbus based on CAN (Controller Area
Network) that is used in automation technology for networking of devices.
** büS - A CANopen-based fieldbus with additional
functionalities.
5.3 Operation of the MFM (Mass Flow Meter)
A sensor is integrated into the MFM to measure the mass flow. The
measured value is transmitted to an external device via a digital output
(fieldbus).
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Type 8741
System description
5.4 Operation of the MFC (Mass Flow Controller)
Design:
• The mass flow is measured by a sensor.
• The MFC is fitted with electronics and a low-friction proportional
valve with a high response sensitivity to control the mass flow.
note!
Malfunction due to contamination.
For problem-free functioning of the MFC, a filter must be installed
in front of the device for contaminated operating media.
See section "6.3.1 Quality of the operating medium"
Operation:
The sensor measures the mass flow and relays the measured value to
the integrated electronics. The electronics compares the measured
current value (x) with the desired setpoint value (w) and calculates the
control value to be transmitted to the proportional valve (Y) in order
to control its opening.
The mass flow is either kept stable at a constant value or altered
according to a predefined profile.
The regulation is performed independent of pressure fluctuations or
increased flow resistance, such as might be caused by dirty filters.
The short response time of the proportional valve and the dynamics of
the sensor determine the setting time.
The measured mass flow value is transmitted to an external device via
a digital output (fieldbus).
In order to obtain a dynamic or quiet measured-value
output signal, the damping of this signal can be adjusted by
the "Bürkert Communicator" software. See section "12.3
Bürkert Communicator (PC software)"
Function diagram:
w
= w-x
x
d
Electronic
x
Medium inlet
Fig. 2 : Function diagram of the MFC (Mass Flow Controller)
Sensor
y
Proportional valve
x
out
Medium outlet
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Type 8741
System description
5.4.1 The MFC electronics
The electronics
• compare the measured value of the mass flow with the specified
setpoint
• and controls the opening of the proportional valve.
Setpoint
The setpoint (w) is transmitted digitally via the fieldbus interface.
For control of a system where rapid flow-rate changes are not permitted,
a ramp function can be activated. This enables the parameters for an
ascending or descending setpoint to be set separately.
More detailed information on the ramp function and on all
other functions can be found in the supplementary manual
"Digital Communication Type 8741".
Control settings
The control settings are preset at the factory.
Amplification factors:
After start-up, the controller operates with amplification factors
dependent on the control-loop properties. The gain factors are calculated automatically when the AUTOTUNE function is conducted. The
AUTOTUNE function optimises the control settings for the installation's
actual conditions.
Dynamic control parameters:
The dynamic for the control loop of the device is influenced by two
settings, the gain (K
) and reset time (Tn). The dynamic control param-
P
eters can be modified using the "Bürkert Communicator" software (see
section "12.3 Bürkert Communicator (PC software)")
The extreme settings are:
1. A very quick regulation with the possibility of overshoots. The
controller reacts to even the smallest deviations. The control may
then cause very strong fluctuations.
2. A slow-acting regulation.
For less dynamic applications, the behaviour of the controller
may be damped. It then reacts slowly to very minor fluctuations
of the measured value or set-point.
Zero point shut-off:
A zero point shut-off is included to ensure the sealing function of the
valve. This is activated if the following conditions occur simultaneously.
1. Setpoint < 2 % of nominal flow rate Q
nominal
(with measuring range 1:50)
2. Measured value < 2 % of nominal flow rate Q
nominal
(with measuring range 1:50)
If the zero point shut-off is active, the PWM signal is set to
0 % so that the valve is completely closed.
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Type 8741
System description
5.4.2 MFC solenoid valve
The solenoid valve used for an MFC is a direct-acting, normally-closed
proportional valve. The nominal diameter of the solenoid valve is
determined by the required nominal flow-rate Q
conditions in the process and the density of the operating medium.
note!
The sealing function of the proportional valve cannot be guaranteed for hard sealing materials.
When used within the specified pressure range, the proportional
valve that is used for the mass flow control also provides the
sealing function.
Exception:
If the seat seal is composed of a special, hard sealing material
(e.g. PCTFE), as for nominal valve diameters of 0.05 and 0.1 mm,
then the leakage rate of the proportional valve may differ from that
of a device with a soft seat seal (e.g. FKM or EPDM).
The maximum leak rate in both cases is 1 Nml/min (air).
A higher tightness may be possible, however it is not standard and
must therefore be requested.
nominal
, the pressure
5.5 Operation of the sensor in the
MFM/MFC
The integrated flow-rate sensors in the MFM/MFC use the thermal
measurement process (anemometric and calorimetric) to measure
the mass flow. This essentially consists of a heating resistor and a
temperature probe. The operating medium which flows through the
device modifies the temperature difference measured between the
two resistors.
The thermal measurement principle allows the MFC to control the
required mass flow almost independently of the pressure and temperature fluctuations in the application concerned.
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Type 8741
Technical data
6 TECHNICAL DATA
6.1 Conformity
The Type 8741 complies with the EC-directives according to the EC
declaration of conformity.
6.2 Standards
The standards used to demonstrate conformity with the Directives
can be consulted in the EC type examination certificate and/or the EC
declaration of conformity.
6.3 Operating conditions
Warning!
Risk of injury from malfunction due to outdoor use.
▶ Do not use type 8741 in outdoor areas.
Permissible ambient temperature: -10 °C to +50 °C
Medium temperature: -10 °C to +70 °C
for oxygen: -10 °C to +60 °C
Permissible humidity: < 95 %, non-condensing
Protection class IP 20, for properly wired
devices with inserted and
tightened push-in connections.
Operating pressure: Max. 10 bar (depending on the nominal
diameter of the proportional valve)
Warning!
Risk of injury caused by pressure, medium escape
Important device-specific data are indicated on the nameplate and
calibration plate.
▶ Only use the device for the specified operating medium.
▶ Do not exceed the specified calibration pressure.
Technical data specified on the nameplate*
• Supply voltage
• Maximum power consumption
• Sealing material
• Nominal flow rate
• Operating medium
• Output signal
Technical data specified on the calibration plate*
• Calibration medium
• Calibration pressure
• Installation position
• Calibration date
*For description see section "6.7 Nameplate, calibration plate"
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Type 8741
Technical data
6.3.1 Quality of the operating medium
For the required measurement and control precision and to meet the
safety requirements, the gas or gas mixture must meet the following
quality criteria according to standard ISO 8573-1 (Compressed Air Part 1: Contaminants and purity classes):
Maximum particle size: Class 2: 1 μm
Maximum particle density Class 2: 1 mg/m³
Maximum dew point under pressure: Class 4: 3 °C
Maximum oil concentration Class 1: 0.01 mg/m³
For further information see ISO 8573-1.
Other hazardous gases are possible on demand; under normal operating conditions the devices do not release any gas.
6.4 Mechanical data
Dimensions: See datasheet
Weight: See datasheet
Materials:
Base block Aluminium or stainless steel 1.4305
Housing: Polycarbonate (PC)
Sealing material: See nameplate
Other parts of the proportional
valve in contact with the medium: 1.4310, 1.4113, 1.4305
6.5 Fluid data
Calibration medium: Operating gas or air
Mass flow range
ref. to N2 (I
Measurement accuracy ± 0.8% meas. val.
Measurement range/control range: 1: 50*
Operating medium: See nameplate
6.5.1 Pressure loss diagram
The diagram shows an example of the compressed air loss for air
flow.
The two air pressure curves on the diagram are examples for the
design/device variants.
• ¼ inch pipe connection and
• flange connection on the bottom of the device (used for mounting
on a block).
/min): 0.01... 80
N
± 0.3% fsd.
(after 1 min. warm-up time)
* Larger measuring range
available on request.
Repeat accuracy: ±0.1% of
full scale deflection
(quality classes according to
DIN ISO 8573-1,
see section "6.3.1").
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Type 8741
0
10
20
30
40
50
60
70
80
90
100
110
120
130
0510 15 20 25 30 35 40 45 50 55 60 65 70 75 80
Q [l
N
/min]
∆p [mbar]
Technical data
Flange
1/4''
6.6 Electrical data
Operating voltage
MFC: 24 V DC ± 10 %;
residual ripple < 2 %
MFM: 24 V DC ± 10 %
Max. Power consumption:
MFM : < 1 W
MFC: Dependent on the proportional
valve used, see nameplate
Communications interface: büS or CANopen
Fig. 3 : Pressure loss diagram, for air, with a 250 µm input filter,
for MFM type
p
For other operating gases, the pressure drop
the graph as a function of the flow rate Q
of the operating gas Q
using the
formula.
Under the root are the densities of the operating gases and of air
in the normal state according to DIN 1343 (PN = 1013.25 mbar,
TN = 273.15 K).
Gas
= Q
the pressure drop can be evaluated
air
air
can be read from
air
. For the same flow rate
LEDs: 1 LED
in accordance with Namur 107*
Electrical connections: 4-pin terminals,
5.08 mm grid
* Standards committee for measurement and control technology (NAMUR)
is an international association of users of automation systems for the
process industry.
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Type 8741
Technical data
6.7 Nameplate, calibration plate
Warning!
Risk of injury caused by pressure, medium escape
Important device-specific data are indicated on the nameplate and
calibration plate.
▶ Only use the device for the specified operating medium.
▶ Do not exceed the specified calibration pressure.
Calibration plate description
Type of device
Calibration medium
Calibration pressure
Installation position
Device order code
Calibration date
Nameplate description:
Sealing material
Max. power consumption
Supply voltage
Type
Nominal flow rate
(Q
) and units
nominal
Operating medium
Output signal
Serial number
Device order code
Manufacturer's code
Fig. 5 : Location and description of the nameplate
Fig. 4 : Location and description of the calibration plate
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Type 8741
Installation
7 INSTALLATION
7.1 Safety instructions
Danger!
Danger due to high pressure in the installation/device.
▶ Before working on the installation or device, cut the pressure
and vent and drain the pipes.
Risk of injury from electric shocks.
▶ Before working on the installation or device, switch off the power
and ensure that it cannot be reactivated.
▶ Observe the applicable accident protection and safety regula-
tions for electrical equipment.
Risk of injury from medium escape.
▶ Observe the applicable accident protection and safety regula-
tions relating to the operating medium used.
Warning!
Danger of injury from improper installation!
▶ The installation must only be carried out by trained personnel
using suitable tools.
▶ Secure the system against unintentional actuation!
▶ Ensure a controlled restart after installation.
Sequence of steps for installing the Type 8741:
1. Mechanical installation
Note installation position!
2. Fluid system installation
3. Fieldbus setting
The fieldbus is preset at the factory.
Changes to this setting should be performed before the
electrical installation. The switch for setting the fieldbus is
difficult to access after the electrical installation.
3. Electrical installation
Ensure the power supply has sufficient output!
7.2 Before installation
→ Before installation of the fluid connections to the MFC/MFM,
remove all dirt from the pipes and fluid carrying components of
the system.
→ Install a suitable filter in front of the device (mesh size ≤ 25 μm)
to ensure the cleanliness of the operating medium.
7.3 Mechanical installation
Observe the installation position given on the calibration plate or in
the calibration protocol.
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Type 8741
Installation
7.4 Fluid system installation
Danger!
Danger due to high pressure in the installation/device.
▶ Before working on the installation or device, cut the pressure
and vent and drain the pipes.
Select the fluid connections according to the maximum mass flow rate.
No inlet section is required.
On request, the device can be supplied with the fluid connections fitted.
Warning!
Danger due to leakage!
At low mass flows and high pressures, particular attention must
be paid to the tightness of the system in order to prevent incorrect
metering or leakage of the operating medium.
To ensure a secure seal
▶ Install the fittings without subjecting them to any stresses
▶ Use compression fittings to ensure sealing of the system.
▶ Use a pipe with a suitable diameter and a smooth surface.
Procedure:
The fluid connection was, as an example, declared relating to the
front of the device but also applies to the connection on the rear of
the device.
→ Cut the pipe squarely [1] and deburr [2].
1 2
Fig. 6 : Cutting the pipe and deburring
→ Remove the protective cap with which the port is closed.
→ Slide the union nut [A] and then the clamping ring onto the pipe.
Clamping
ring
A
Fig. 7 : Slide the union nut and clamping ring onto the pipe.
C
B
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Type 8741
Installation
→ Fix the sealing ring [C] and the connecting thread [B] to the
device (tightening torque 25 - 28 Nm).
C
Fig. 8 : Fix the sealing ring and screw on the connecting thread
B
→ Insert the pipe and tighten the union nut [A] by hand.
A
Fig. 9 : Insert pipe and tighten the union nut.
→ Tighten the lock nut with an open-end spanner so that the con-
nection is leak tight (tightening torque 25 - 28 Nm).
Fig. 10 : Tighten the union nut.
Now make the fluid connection to the back of the device in the same
way.
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Type 8741
Installation
7.5 Setting up the fieldbuses
büS or CANopen can be selected as the standard for the fieldbus.
The fieldbus is preset at the factory.
Changes to this setting should be performed before the
electrical installation. The switch for setting the fieldbus is
difficult to access after the electrical installation.
There is a switch on the top of the device for setting the fieldbus.
Fig. 11 : Switch for setting the fieldbus.
The configured fieldbus is accepted by the device after a
restart.
7.6 Electrical installation
Danger!
Risk of injury from electric shocks.
▶ Before working on the installation or device, switch off the
power and ensure that it cannot be reactivated.
▶ Observe the applicable accident protection and safety regula-
tions for electrical equipment.
note!
Requirements for the proper function of the device!
▶ Use a power supply with sufficient output.
▶ Pay attention to the maximum permissible residual ripple on the
operating voltage (residual ripple < 2 % ).
▶ Use only shielded cables with a braid or foil shield.
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Type 8741
Installation
7.6.1 Connect the power supply and
communication cable
Electrical input assignments:
1 2 3 4
Fig. 12 : Assignment; screw terminals, 4-pin
Procedure:
Screw terminals,
4-pin
Pin Assignment
1 DGND
2 CAN_L
3 CAN_H
4 24 V
→ Open the protective cover of the MFM/MFC.
On the inside of the protective cover there are engraved symbols
and a support as a stop for assembly of the cable.
Braid
Cable shielding
Sheath
Support
insulation
Cable assembly: (See "Fig. 13")
→ Remove the insulation sheath over a length of approx. 25 mm.
→ Shorten the cable shielding to the required length (see engraved
symbols on the inside of the protective cover).
→ Pull back the cable shielding over the insulation sheath.
→ Attach the braid according to the assignment on the screw ter-
minals of the plug connector.
→ To relieve any strain on the cable, secure it to the housing of the
MFC/MFM using a cable tie.
Recess for attaching the
cable tie
Cable tie
Plug connector
Fig. 14 : Attached cable with strain relieved by cable ties
Fig. 13 : Assembly of the cable for the electrical connection
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Type 8741
Installation
7.7 Connecting the functional earth
Warning!
Danger of ignition and fire due to electrostatic discharge!
An electrostatic discharge of the device can ignite combustible
gas vapours.
▶ The housing is connected via a short cable with a large
cross-section to the functional earth (FE) to avoid a build up of
electrostatic charge.
Danger from electromagnetic fields!
If the functional earth (FE) is not attached, the provisions of the
EMC regulations are not met!
▶ The housing is connected via a short cable with a large cross-
section to the functional earth (FE).
There are two screws that can be used for either the functional
earthing of the cable shielding or earthing the device.
Functional earth connection:
M3 screw
M4 screw
Connection of the cable screen to screw ME3:
note!
Requirements for the proper function of the device!
The cable shield must be attached to functional earth FE on the
two outermost devices.
Devices which are connected to the trunk pipe using a drop pipe
longer than 3 m, must also have their cable shielding attached. In
this case, the cable shielding is not pulled back over the sheath
insulation.
→ Draw a strand out of the braid of the cable shielding.
→ Attach the strand wire directly to the M3 screw of the functional
earth or use a cable lug to attach it to the functional earth.
FE
Fork-type cable lug
Fig. 16 : Cable shielding connection
FE
Cable shielding
Fig. 15 : Connection options for functional earthing FE
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Type 8741
Commissioning
8 COMMISSIONING
8.1 Safety instructions
Warning!
Danger of injury from improper operation!
Improper operation can lead to injuries and damage to the device
and its environment.
▶ Before commissioning, it must be ensured that the operating
personnel are familiar with, and fully understand, the content of
this operating manual.
▶ The safety information and the intended use must be observed.
▶ Only properly trained personnel may commission the
installation/device.
Sequence of steps for commissioning:
→ 1. Pressurise the pipes with operating medium
→ 2. Flush the pipes with operating medium at the calibration
pressure and then vent them completely.
→ 3. Run the AUTOTUNE function.
Only required if the operating medium is not the calibration
medium or if the pressure conditions have changed (See
section "9.6.1 AUTOTUNE function" on page 27).
→ 3. Regular operation
9 OPERATION AND FUNCTION
9.1 Safety instructions
Warning!
Danger due to improper operation!
Improper operation can lead to injuries and damage to the device
and its environment.
▶ The operating personnel must have read and understood the
content of this manual.
▶ The safety information and the intended use must be observed.
▶ Only properly trained personnel may operate the installation/
device.
The MFM/MFC is operated via fieldbus communication.
The connection to a PC is made via the communication interface using
the "Bürkert Communicator" software.
The MFM/MFC has an LED to display the instrument status, the colour
and status change according to NAMUR 107.
9.2 Normal control mode
After applying the operating voltage, the MFM/MFC enters a short
initialisation phase and then switches to AUTOMATIC operating mode.
The mass flow is controlled via the setpoint sent via the fieldbus.
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Type 8741
Operation and function
The control parameters are set so that changes in the setpoint are
effected as quickly as possible and without significant overshooting.
The measured value for the mass flow-rate is made available via the
fieldbus communication interface.
9.3 Device status LED
The MFM/MFC has an LED to display the instrument status, the colour
and status change according to NAMUR 107.
If more than one device status exists simultaneously, the device status
with the highest priority is displayed.
Short description:
A detailed description of the displayed device status and see
chapter "11.1 Display of the device status" on page 32
Display in
accordance with
NE 107
Colour
Red Fault Malfunction.
Orange Warning Ambient or process conditions for the
Description Meaning
Device functionality is not guaranteed.
device are outside the permissible
ranges.
Potential damage to the device.
Display in
accordance with
NE 107
Yellow Outside
Colour
Blue Maintenance
Green Diagnostics
White Normal
Lit Device is in
Status
Blinking Device is in
Description Meaning
specification
required
active
operation
AUTOMATIC
operating
mode
MANUAL
operating
mode
Ambient or process conditions for the
device are outside the permissible
ranges.
Datasheet values cannot be complied
with.
Device has detected a deviation while
running a diagnosis and made a correction.
Restricted device functionality.
Device functionality disabled.
Performing diagnostic functions.
Device is operating within its
specifications.
Device using standard setpoint for
control.
Manual setpoint default for the proportional valve or SETPOINT SOURCE
set to Manual setpoint.
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Type 8741
Operation and function
Display in
accordance with
NE 107
Status Flashing*
* For a detailed description of the fieldbus protocols for type 8741, see
supplementary manual entitled "Digital Communication Type 8741".
Description Meaning
Identification:
Device connected to the
network*
Identifies a device on the büS
network.
"Flashing" status is started when the
device is selected in the "Bürkert
Communicator" software.
Table 1: Description of LED display; Device Status
9.4 Setting up the fieldbuses
büS or CANopen can be selected as the standard for the fieldbus.
The fieldbus is preset at the factory.
There is a switch on the top of the device for setting the fieldbus.
This switch is partially covered by the connector once the device
is electrically connected. It is therefore recommended to set the
fieldbus before electrical connection.
View without plug connector:
View with plug connector:
The switch for setting the
fieldbus is partially covered by
the connector.
Fig. 17 : Switch for setting the fieldbus.
The configured fieldbus is also retained by the device after
a restart.
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Type 8741
Operation and function
9.5 Removable data memory
The MFC/MFM has a removable data memory the size of a micro SIM
card, on which the device-specific data is stored.
The device is delivered with the micro SIM card inserted.
The micro SIM card enables the exchange of specific data with devices
having the same ID number. For example, to transfer the data from a
faulty unit to a new device.
The micro SIM card holds, for example, the baud rate, the address and/
or the designations of the measuring points of the device.
If, at restart, there are device-specific data on the micro SIM card
inserted, then the device adopts this data.
If there are no device-specific data on the micro SIM card, the device
loads its own data onto the card.
A list of the stored data can be found in the supplementary
operating instructions "Digital Communication, Type 8741".
note
It is not possible to use a standard micro SIM card for the device.
Please obtain the micro SIM card for the Type 8741 from your
local Bürkert sales office.
See section "12.1 Electrical Accessories".
9.5.1 Exchanging the micro SIM card
→ Slide the micro SIM card into the device as shown in "Fig. 18".
Pay attention to the direction of insertion!
Micro SIM card
Cross-sectional
drawing:
Micro SIM card
in the device
Fig. 18 : Exchanging the micro SIM card
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Type 8741
Operation and function
9.6 Functions
9.6.1 AUTOTUNE function
Function optimisation of the MFC control parameters.
For the MFC, the AUTOTUNE function is conducted at the
factory. This is done at the operating pressure and with the
calibration medium specified in the calibration protocol.
A re-run of this function is not normally necessary.
However, a re-run of the AUTOTUNE function is required in
the following cases:
• If the pressure conditions in the installation have changed.
• If the operating medium is not the same as the calibration
medium.
Description:
With the AUTOTUNE function, the control parameters for the device
which are dependent on the conditions of the installation, are calculated and optimised.
The proportional valve is activated according to a pre-defined scheme,
by which the mass flow changes. Certain control parameters are then
adapted to local conditions. Optimisation is carried out according to
the criteria for as short a recovery time as possible, without overshoot.
Warning!
Danger from flowing gas.
While the AUTOTUNE function is running, the gas flow may be
greater than the nominal flow.
▶ Before running AUTOTUNE, check whether a hazard could arise
through an increased gas flow and take appropriate measures
to ensure safety.
During the AUTOTUNE:
→ Do not interrupt the power supply to the MFC.
→ Keep the supply pressure constant.
The AUTOTUNE function is triggered via the fieldbus. (See
operating instructions "Digital Communication, Type 8741").
• During the running of the AUTOTUNE function, the LED on the
device is lit green.
• The flow control of the MFC is suspended.
• After completion of the AUTOTUNE, the device returns to its previous
operating state.
• After successful running of AUTOTUNE, the optimised control settings are transferred to the hard memory of the device.
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Type 8741
Operation and function
9.6.2 In the büS network, other peers
process the process values.
The MFM/MFC can receive and process the process values from other
büS peers in a büS network.
For example, another bus peer can provide the MFC with a setpoint or
the MFC/MFM can send its process values to other büS peers. In this
way, the current measured value can be received by a different device.
"Bürkert Communicator" software is required to configure this function
(see Section 10.3.1 PC Software). The procedure is described in the
supplementary operating instructions "Digital Communication, Type
8741".
9.6.3 Specifying the SETPOINT SOURCE
The MFC can specify controlling setpoints from various sources.
It is possible to switch between SETPOINT SOURCES during
operation.
The change of SETPOINT SOURCE occurs via
• a setting in the "Bürkert Communicator" software (see section
"12.3 Bürkert Communicator (PC software)") or
• by changing an EDS object of the device.
The SETPOINT SOURCE setting is normally retained after
a restart. However, this is not the case if the device performs a SYSTEM ANALYSIS function.
The procedure for specifying the SETPOINT SOURCE is
described in the supplementary operating instructions "Digital
Communication, Type 8741".
AUTOMATIC function:
If the AUTOMATIC setpoint source is selected, a standard setpoint is
used which is specified via the CANopen or büS fieldbus. This standard
setpoint can be manipulated by other fieldbus peers.
If different fieldbus peers simultaneously specify a setpoint for the
device, it is always the most recent value that is used for control.
MANUAL SETPOINT function:
The manual specification of a setpoint is used independently of the
standard setpoint used in AUTOMATIC operating mode.
This ensures that the setpoint value for testing purposes or the modification by a display cannot we overwritten from other fieldbus peers.
STORED SETPOINT function:
A fixed setpoint can be applied using this function. This fixed setpoint,
which is used for regulation, remains even when the device is restarted.
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Type 8741
Operation and function
OPEN LOOP CONTROL function:
This function allows the duty cycle to the proportional valve to be
specified directly. When this function is activated the current duty
cycle is used.
Following a restart of the device, the cycle is set to zero.
SYSTEM ANALYSIS function:
When executing the SYSTEM ANALYSIS function, the device operates
under the normal conditions of the AUTOMATIC operating mode.
This involves a predefined chronological sequence with setpoints.
The resulting diagram can be used in combination with the graphical
representation of process values to analyse the system via the "Bürkert
Communicator" software.
9.6.4 User-defined calibration
The devices are always delivered with a calibration by the manufacturer.
Using the "Bürkert Communicator" software, a user-defined calibration
can be specified on the basis of this calibration. For this purpose, up
to 32 calibration points can be specified.
The procedure for user-defined calibration is described in the
supplementary operating instructions "Digital Communication,
Type 8741".
9.6.5 Updating the cyclic data
The cyclic data can be updated from the device with a specific inhibit
time. The inhibit time determines the time span in which a process
value is updated.
An inhibit time of 100 ms means:
After a period of 100 ms, a new process value is provided via the
fieldbus.
For fast processes, the inhibit time for cyclic data can be reduced to
as low as 10 ms.
After a restart of the device, the inhibit time is reset to the standard time.
For field bus networks with a high number of peers, a low
inhibit time may restrict the transfer of the data from all peers.
It is recommended that the default inhibit time values of the
device are always used.
The inhibit time is changed via
• a setting in the "Bürkert Communicator" software (see section
"12.3 Bürkert Communicator (PC software)") or
• by changing an EDS object of the device.
The procedure for specifying the inhibit time is described in the
supplementary operating instructions "Digital Communication,
Type 8741".
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Type 8741
Maintenance
10 MAINTENANCE
The MFM/MFC is maintenance-free, provided that no heavily contaminated media are used and that it is operated according to the
instructions in this manual.
10.1 Maintenance for operation with heavily contaminated media
Danger!
Danger due to high pressure in the installation/device.
▶ Before working on the installation or device, cut the pressure
and vent and drain the pipes.
Risk of injury from electric shocks.
▶ Before working on the installation or device, switch off the
power and ensure that it cannot be reactivated.
▶ Observe the applicable accident protection and safety regula-
tions for electrical equipment.
Warning!
Danger of injury from improper maintenance work!
▶ Maintenance must only be performed by trained personnel using
suitable tools.
▶ Secure the system against unintentional actuation.
▶ Ensure a controlled restart after maintenance.
Warning!
Risk of injury from malfunction and failure by opening the
housing!
There are sensitive parts inside the device to control the flow and
for measurement of the flow rate.
▶ Do not open the device housing.
▶ Only the cleaning and maintenance work described in this
manual may be carried out on the device.
▶ Further work and calibration may only be performed by the
manufacturer.
If a heavily contaminated operating medium is used:
→ Regularly inspect the contamination of the stainless steel mesh
filter [5].
→ Clean or replace the stainless steel mesh filter when required, as
described below.
For spare parts, see section "12.5 Spare parts".
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Type 8741
Maintenance
10.1.1 Cleaning the stainless steel mesh
filter
1 2
Fig. 19 : Cleaning the stainless steel mesh filter
4 5
3
Item Description
Screw
1
Inlet flange plate
2
O-Ring
3
O-Ring
4
Stainless steel mesh filter
5
→ Remove the inlet flange plate [2] by loosening the two screws [1]
(see "Fig. 19").
→ Remove the O-ring [4] and the stainless steel mesh filter [5].
→ Clean the stainless steel mesh filter [5].
Do not clean with tap water!
Clean with acetone, isopropanol or compressed air.
→ Dry the stainless steel mesh filter after cleaning.
→ Install the parts in the correct order (see "Fig. 19").
The fine side of the stainless steel mesh filter [5] must face
the inlet flange plate [2].
Before tightening the inlet flange plate, make sure that the
stainless steel mesh filter and the O-rings and seated flat and
not tilted.
→ Screw on the inlet flange plate [2].
10.2 Cleaning and recalibration at the factory
If the sensor is contaminated or damaged by operation, it may be that
the signal for the mass flow rate no longer corresponds to the actual
mass flow rate.
In this case the sensor must be replaced and recalibrated by the
manufacturer.
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Type 8741
Device status/Troubleshooting
11 DEVICE STATUS/TROUBLESHOOTING
11.1 Display of the device status
The MFM/MFC has an LED to display the device status, the colour and status change according to NAMUR 107.
If more than one device status exists simultaneously, the device status with the highest priority is displayed.
LED acc. to NE 107 Description What to do?
OFF The device is not energized. Energize the device.
Flashing
(any colour)
White / Lit
White / Flashing Mode 1:
Red / Lit Mode 1: faulty sensor. Maintenance is needed –
Device is selected using the "Bürkert Communicator"
software.
The device is energized and in a control mode (see
chap. "9.6.3").
A CANopen/ büS communication is established. In the
case of a büS device, an assigned büS peer has been
found.
Control loop disabled, direct specification of the variable
to the valve.
Mode 2:
SETPOINT SOURCE set to STORED
SETPOINT
Mode 3:
If a CANopen communication is established, the device is
in a Pre-operational Mode or in a Stopped Mode.
Mode 2: faulty memory.
Mode 3: faulty device.
Deselect the device in the Communicator.
-
-
-
-
Contact the manufacturer.
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Type 8741
Device status/Troubleshooting
LED acc. to NE 107 Description What to do?
Red / Lit Mode 4: communication with other büS peers is
impossible.
Mode 5:
Supply voltage is 20% under or above the nominal value.
Red / Flashing Mode 1: Bus error (e.g. short-circuit).
Connect the device in a network with other peers.
Check the power supply.
Check the wiring. Exception:
SETPOINT.
Mode 2:
Supply voltage is 20% under or above the nominal value.
Mode 3: the device cannot find the assigned büS peer. Make sure the büS peer is affected to the device.
Orange / Lit Mode 1: The medium temperature or the device tempe-
rature is outside the specifications: potential destruction
of the sensor or the device.
Mode 2:
The control variable for the proportional valve has (almost)
reached 100%. The setpoint cannot be reached.
Mode 3 :
The device has detected an error in the büS fieldbus.
Mode 5 :
Supply voltage is 10% under or above the nominal value.
Check the power supply.
Exception:
Operate the device within the specifications.
Increase the operating pressure (observe the maximum permissible
supply pressure).
Check the pressure drop in the pipe and reduce it if necessary.
Check the dimensions of the installation.
Check the filters installed in the pipe and clean them if necessary.
If this mode persists for more than 5 seconds, restart the network.
Check the power supply.
SETPOINT SOURCE set to STORED
SETPOINT SOURCE set to STORED SETPOINT
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Type 8741
Device status/Troubleshooting
LED acc. to NE 107 Description What to do?
Orange / Flashing Mode 1: calibration activated. -
Mode 2:
The control variable for the proportional valve has (almost)
reached 100%. The setpoint cannot be reached.
Mode 3: Search for a büS participant in progress. Mode is
abandoned after a few seconds.
Mode 4: The device has detected an error on the büS
fieldbus.
Mode 5:
Supply voltage is 10% under or above the nominal value.
Yellow / Lit Function AUTOTUNE has failed. Restart the AUTOTUNE function.
Increase the operating pressure (observe the maximum permissible
supply pressure).
Check the pressure drop in the pipe and reduce it if necessary.
Check the dimensions of the installation.
Check the filters installed in the pipe and clean them if necessary.
If this mode persists for more than 4 minutes, restart the network.
Restart the device.
Check the power supply.
Blue / Lit Memory error.
Error detected in the calibration curve.
Green / Lit Mode 1: Function AUTOTUNE active. -
Mode 2: Function ASYSTEM ANALYSIS active. -
Table 2: Description: LED display of the device status and measures
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Maintenance is needed –
Contact the manufacturer.
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Type 8741
Device status/Troubleshooting
11.2 Troubleshooting
Problem Possible cause What to do?
The Namur LED goes out
periodically
The exchange device adopts
none of the values on the
micro SIM card from the faulty
device
The exchange device does not
adopt all of the values on the
micro SIM card from the faulty
device
MFM/MFC does not adopt
the values of an assigned büS
peer
No mass flow rate The setpoint is below the zero-point shut-off
The power supply is intermittently dropping - the
device therefore performs a reset.
The voltage drop in the connecting cable is too
large.
The ID number of the exchange device differs
from that of the defective device.
Micro SIM card is faulty - Device could not write
any values to the micro SIM card.
The EDS device description of the exchange
device differs from that of the defective device.
The value to be adopted is not properly assigned
in the MFM/MFC.
The value to be adopted is not supplied from the
assigned büS peer.
The assigned büS peer is defective. Replace the instrument of the assigned büS peer.
limit.
The device is not in the normal control mode.
See section "9.2 Normal control mode".
The pipes are too large or not yet fully vented. Vent the pipes.
Use a power supply with sufficient power output.
Increase the cross-section of the cable.
Reduce the cable length.
Values can only be transferred between devices with the same ID number.
Replace the micro SIM card (see accessories) and search again for the
settings of the defective device to transfer to the card (see section "9.5.1
Exchanging the micro SIM card").
Only the existing values of the defective device can be adopted by the
exchange device. The new values of the exchange device must be configured using the "Bürkert Communicator" software.
Assign the value to be adopted in the device using the "Bürkert Communicator" software.
Assign the value to be adopted in the assigned büS peers using the
"Bürkert Communicator" software.
Increase the setpoint value to > 2% of the nominal flow rate.
Check whether the device is running one of the functions described in
section "9.6".
Change the pipe diameter.
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Type 8741
Device status/Troubleshooting
Problem Possible cause What to do?
Unstable measured value The functional earth (FE) is not properly
Setpoint at 0 % but operating
medium still flows
Setpoint value at 0 %, valve
is closed, no mass flow, but
a non-zero mass flow rate is
measured
Setpoint value is not reached The inlet filter is clogged. Clean or replace the inlet filter.
connected.
The controller must compensate for irregularities
in an unstable pressure supply caused, for
example, by pumps.
The residual ripple on the voltage supply is too
high.
The operating pressure is above the tight sealing
pressure of the proportional valve.
The installation position of the device is
incorrect.
The device was not calibrated with the operating
medium used.
The inlet pressure is too low. Increase the inlet pressure to the calibration pressure value.
The outlet pressure is too high. Check whether the fluid connection pipes after the device are dirty and
Connect the functional earth with the shortest possible cable, crosssection at least 2.5 mm².
Install a suitable pressure regulator in front of the device.
Install a buffer tank to absorb the pressure fluctuations.
Use a suitable supply voltage. See technical data.
Reduce the operating pressure.
To eliminate the defect, return the device to the manufacturer.
Install the device in the position indicated on the calibration plate or in
the calibration protocol and run the AUTOTUNE function to adapt to the
operating conditions.
Return the device to the manufacturer for recalibration.
clean if necessary.
Table 3: Troubleshooting
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Type 8741
Accessories /Spare Parts
12 ACCESSORIES /SPARE PARTS
Caution!
Danger of injury and material damage due to unsuitable
parts!
Incorrect accessories and unsuitable replacement parts can cause
injuries and damage to the device and its environment.
▶ Only use original accessories and spare parts from Bürkert.
12.1 Electrical Accessories
Item Order code
4-pin plug connector for Type 8741 565876
4-pin plug connector for Type 8741 with
integrated 120-ohm terminal resistor
büS stick set (including power supply) 772426
Micro SIM card On request
EDS file Download from
"Bürkert Communicator" software Download from
Table 4: Electrical Accessories
Cable assemblies can be made on request.
566066
www.burkert.com
www.burkert.com
12.2 Fluid accessories
The MFM / MFC is equipped with a threaded process connection plate
according to DIN ISO 228/1.
A threaded fitting, available as an accessory, is used to connect the
device to a pipe:
• The connection to the device side has a DIN ISO 228/1 thread,
• The connection to the pipe side is available in a range of dimensions.
• The fluid connection should be selected with regard to the application.
• Compression or olive-type fittings are suitable for many applications,
however alternative fittings can also be used.
12.2.1 Compression fittings
The following compression fittings are available from Bürkert for the
MFM/MFC.
Device connection with
thread in
accordance with
DIN ISO 228/1
G 1/4 6 mm
G 1/4 8 mm 901 540 901 575
G 1/4 1/4" 901 551 901 579
G 1/4 3/8" 901 553 901 579
Table 5: Compression fittings
Pipe
diameter
Material Order
code
901 538 901 575
Stainless
steel
Order code
for seal
ring
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Type 8741
Accessories /Spare Parts
The seal for each threaded connection must be ordered
separately.
Each order code includes one piece.
12.3 Bürkert Communicator (PC software)
The "Bürkert Communicator" PC software enables communication
with the type 8741.
"Bürkert Communicator" software runs under Windows. It
needs a büS stick to communicate with the MFM/MFC via a
USB interface.
(see "Table 4: Electrical Accessories" on page 37).
"Bürkert Communicator" software enables:
• the reading of certain specific device data,
• activation of various features,
• modification of certain dynamic properties,
• adjustment of the user-defined calibration curve,
• performance of firmware updates,
• the reading of error memories.
12.4 Additional documentation
• Contamination Declaration, order code 806 075
• Supplementary operating instructions "Digital Communication"
on the description of the fieldbus protocol for the Type 8741
(download from www.burkert.com).
12.5 Spare parts
Item Order code
Stainless steel mesh filter, mesh size 250 μm,
for MFM
Stainless steel mesh filter, mesh size 25 μm, for
MFC
Table 6: Spare parts for MFM, MFC
654 733
676 329
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Type 8741
Dismantling
13 DISMANTLING
13.1 Safety instructions
Danger!
Danger due to high pressure in the installation/device.
▶ Before working on the installation or device, cut the pressure
and vent and drain the pipes.
Risk of injury from electric shocks.
▶ Before working on the installation or device, switch off the
power and ensure that it cannot be reactivated.
▶ Observe the applicable accident protection and safety regula-
tions for electrical equipment.
Warning!
Risk of injury from improper dismantling!
▶ Dismantling must only be performed by trained personnel using
suitable tools.
Risk of injury from hazardous media.
▶ Before disconnecting pipes or valves, flush out hazardous
media, release pressure in the pipes and drain.
▶ Observe the applicable accident protection and safety regula-
tions relating to the operating medium used.
Procedure:
B
A
C
Fig. 20 : Dismantling the MFM/MFC
→ Relieve the operating medium pressure in the system.
→ Flush the device with a neutral medium (e.g. nitrogen)
→ Relieve the flushing medium pressure in the system.
→ Switch off the power.
→ Remove the cable tie [A] that was applied to relieve any strain.
→ Remove the electrical wiring [B].
→ Disconnect the fluid connections [C].
→ Remove the MFM/MFC.
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Type 8741
Transport, storage, disposal
14 TRANSPORT, STORAGE,
DISPOSAL
note!
Transport damage!
Damage can be caused to insufficiently protected devices in
transport.
• Remove cables, connectors, separate filters and mounting
hardware.
• Clean and vent contaminated devices.
• Close the fluid connections with protective caps to prevent damage
and protect the sealing.
• Pack the device in two suitable zip lock bags.
• Transport the device in an impact-resistant package, protected
from moisture and dirt.
• Avoid storage above or below the recommended storage
temperature.
Incorrect storage can cause damage to the device.
• Close fluid connections with protective caps.
• Store the device dry and dust-free in sealed zip lock bags!
• Storage temperature -10 … +70 °C.
Environmental damage due to parts contaminated by media.
• Dispose of the device and its packaging in an environmentally
friendly manner!
• Comply with applicable environmental and disposal regulations.
15 RETURNING THE DEVICE
No work or tests will be carried out on the device until a
valid Contamination Declaration has been received.
The Contamination Declaration can be downloaded from our
homepage or requested from your local Bürkert sales office.
www.buerkert.de
Commissioning
To return a device already in use, a returns number is
required.
To return a device that has already been used to Bürkert, proceed as
follows:
Service
Contamination Declaration
Service / Maintenance /
→ Fill out the Contamination Declaration.
→ Send the declaration to the address indicated on the form: You
will then receive a Returns Number by fax or post from Bürkert.
→ Pack the device as described in section "14".
→ Return the device to Bürkert with the Contamination Declaration,
quoting the returns number.
Address:
Bürkert Fluid Control Systems
Corporate Quality / Complaint Management
Chr.-Bürkert-Str. 13-17
D-74653 Ingelfingen
Tel. + 49 (0) 7940 - 10 91 599
Fax + 49 (0) 7940 - 10 91 490
E-Mail: service.international@burkert.com
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www.burkert.com
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