Burkert 8746 Operating Instructions Manual
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Burkert 8746 Operating Instructions Manual

Burkert 8746 Operating Instructions Manual

Mass flow meter / mass flow controller
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Type 8746
Mass flow meter / Mass flow controller
Operating Instructions

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  • Page 1 Type 8746 Mass flow meter / Mass flow controller Operating Instructions...
  • Page 2 We reserve the right to make technical changes without notice. © Bürkert SAS, 2015 - 2025 Operating Instructions 2501/08_GBen_00810417 / Original EN...

  • Page 3: Table Of Contents

    Type 8746 Table of contents Table of contents About this document  6 Symbols  6 Terms and abbreviations  7 Manufacturer  7 2 Safety  8 Intended use  8 Safety instructions  8 3 Product description  11 Product overview  11 Product identification  13 3.2.1 Type label  13...
  • Page 4 Type 8746 Table of contents Additional documentation  32 Wire the variant büS /CANopen  32 6.2.1 With büS extension cables from Bürkert  32 6.2.2 With büS cables from Bürkert  32 6.2.3 With CANopen cables  33 Wire the variant Analogue  34 6.3.1 Digital input  36...
  • Page 5 Type 8746 Table of contents 10.6 Status indicator goes out periodically  66 10.7 Replacement device adopts none of the values from the defective device  66 10.8 Replacement device does not adopt all of the values from the defective device  66 10.9...

  • Page 6: About This Document

    Type 8746 About this document About this document The document is an important part of the product and guides the user to safe installation and operation. The information and instructions in this document are binding for the use of the product.

  • Page 7: Terms And Abbreviations

    Type 8746 About this document Terms and abbreviations The terms and abbreviations are used in this document to refer to following definitions. Device Type 8746 Mass flow meter Mass flow controller büS Bürkert system bus, a communication bus developed by Bürkert and based on...

  • Page 8: Safety

    Type 8746 Safety Safety Intended use The device MFM is designed to measure the mass flow rate of clean and dry gases. The device MFC is designed to measure and regulate the mass flow rate of clean and dry gases.
  • Page 9 Type 8746 Safety ▶ The operator must make hazards arising from the location of the device avoidable by providing appropriate operating instructions. Electrostatically sensitive components and assemblies The device contains electronic components that are susceptible to the effects of electrostatic discharging (ESD).
  • Page 10 Type 8746 Safety Technical limit values and media Non-compliance with technical limit values or unsuitable media can damage the device and lead to leaks. This can cause accidents and seriously injure or kill people. ▶ Comply with limit values. See Technical data [} 19]...

  • Page 11: Product Description

    Type 8746 Product description Product description The device is used for ultimate precision in the feedback control of medium. This document describes following variant: • MFM Analogue • MFM büS/CANopen • MFM Industrial Ethernet • MFM Profibus • MFC Analogue with proportional valve •...
  • Page 12 Type 8746 Product description MFM büS/CANopen Fig. 2: Example of a variant MFM 1 Flow direction marking 2 Base block 3 Functional earth connection 4 Medium connection 5 Electrical connection MFC Analogue, Industrial Ethernet, Profibus Fig. 3: Example of a variant MFC...

  • Page 13: Product Identification

    4 Functional earth connection 5 Medium connection 6 Electrical connection Product identification 3.2.1 Type label Fig. 5: Example of type label Type 8746 1 Type 2 Operating voltage 3 Power consumption 4 Note: Observe the operating instructions 5 Bürkert internal version...

  • Page 14: Calibration Label

    Type 8746 Product description 3.2.2 Calibration label Mass Flow Controller Medium 1 Medium 2 P1: 1,00 barg P1: 1,00 barg Mounting: horizontal upright Id: 00****** QC passed: __ . __ . ____ Fig. 6: Example of calibration label 1 Variant 2 Calibration medium...

  • Page 15: Namur Mode

    Type 8746 Product description The colour of the status indicator indicates: • Whether device diagnostics are active or not. Diagnostics are active on the device and cannot be deactivated. • If diagnostics are active, then the status indicator shows whether diagnostics events have been generated or not.

  • Page 16: Communication Indicator

    Type 8746 Product description Fig. 8: Location and description of the LED's 1 Ethernet Port 1 2 Ethernet Port 2 3.3.4 Communication indicator Applicable for: • Industrial Ethernet variant • PROFIBUS variant This LED shows the status of the communication between the device and the PLC (Programmable Logical Controller).

  • Page 17: Control Valve

    Type 8746 Product description Fig. 9: büS stick, inserted in the related connector of the device 3.4.2 Control valve Applicable for: • MFC with proportional valve The control valve is a direct-acting and normally-closed proportional valve. The control valve provides the sealing function when the following conditions are met: •...
  • Page 18 Type 8746 Product description ▶ Activate this functionality in the Bürkert communicator under General settings > Parameter > Act as a configuration client > Yes. For detailed information, refer to the "Software manual | Central configuration management" (this manual exists in several languages).

  • Page 19: Technical Data

    Type 8746 Technical data Technical data Standards and directives The device complies with the valid EU harmonisation legislation. The harmonised standards that have been applied for the conformity assessment procedure are listed in the current version of the EU Declaration of Conformity.

  • Page 20: Medium Data

    Type 8746 Technical data MFC with motor valve Ambient temperature −10…+50 °C Storage temperature −10…+70 °C Degree of protection (EN 60529 / IP65 IEC 60529) Medium temperature • −10…+70 °C • −10…+60 °C for oxygen Medium Refer to the type label Clean and dry. Quality classes according to DIN ISO 8573-1.
  • Page 21 Type 8746 Technical data MFC with proportional valve Calibration medium Operating fluid or air Mass flow rate range (reference 20…1500 l /min to N2 (l /min)) Turn-down ratio 1:50 Repeatability ±0.1% of the full scale Measurement accuracy, after 15 ±1.5% of the measured value minute warm-up time ±0.3%...

  • Page 22: Electrical Data

    Type 8746 Technical data Electrical data MFM Analogue Operating voltage 24 V   ±10 % Power consumption < 2 W Analogue input for the measured Maximum input impedance: 200 Ω value Resolution: 5 μA 0/4...20 mA Analogue input for the measured Minimum input impedance: 20 kΩ value Resolution: 2,5 mV 0...5/10 V...
  • Page 23 Type 8746 Technical data MFM büS/CANopen Operating voltage 24 V   ±10 % Power consumption < 2 W Communication interface büS and CANopen. The communication type can be selected with the Bürkert Communicator software. Electrical connections M12 plug 5-pin A-coding Minimum temperature rating of 90 °C...
  • Page 24 Type 8746 Technical data MFC Analogue Operating voltage 24 V    ±10 % residual ripple < 2 % Power consumption Refer to type label Analogue input for the measured Maximum input impedance: 200 Ω value Resolution: 5 μA 0/4...20 mA Analogue input for the measured Minimum input impedance: 20 kΩ...

  • Page 25: Communication

    Type 8746 Technical data MFC büS/CANopen Operating voltage 24 V    ±10 % residual ripple < 2 % Power consumption Refer to type label Communication interface büS and CANopen. The communication type can be selected with the Bürkert Communicator software. Electrical connections...

  • Page 26: Industrial Ethernet: Ethernet/Ip

    Type 8746 Technical data 4.5.2 Industrial Ethernet: EtherNet/IP Pre-defined standard objects Identity Object (0x01) Message Router Object (0x02) Assembly Object (0x04) Connection Manager (0x06) DLR Object (0x47) QoS Object (0x48) TCP/IP Interface Object (0xF5) Ethernet Link Object (0xF6) DHCP supported...

  • Page 27: Profibus Dpv1

    Type 8746 Technical data 4.5.5 PROFIBUS DPV1 Acyclic communication DPV1 Class 1 Read/Write DPV1 Class 2 Read/Write/Data Transport Transmission speed Fixed values from 9.6 kbit/s to 12 Mbit/s Autodetect mode is supported Mechanical data Dimensions Refer to data sheet Base block Aluminium or stainless steel 1.4305...

  • Page 28: Medium Connection

    Type 8746 Medium connection Medium connection Risk of injury or material damage when working on the device or system. ▶ Read and observe the chapter Safety [} 8] before working on the device or system. Possible medium connections • G-internal-threaded connections according to DIN ISO228/1 •...

  • Page 29: Npt-Internal-Threaded Connections

    Type 8746 Medium connection ▶ Remove all dirt from the pipes and from the components of the installation that carry the medium. ▶ Cut the pipe squarely [A] and deburr [B]. ▶ Remove the protective cap that closes the threaded connection.

  • Page 30: Flange Connections

    Type 8746 Medium connection ▶ Remove all dirt from the pipes and from the components of the installation that carry the medium. ▶ Cut the pipe squarely [A] and deburr [B]. ▶ Remove the protective cap that closes the threaded connection.

  • Page 31: Tri-Clamp Connections

    Type 8746 Medium connection ▶ CAUTION! To avoid damage on the sealing of the medium connection, please make sure to lock the hexagonal part in place with a second wrench. Obey the torques that are given by the manufacturer of the fitting used.

  • Page 32: Electrical Connection

    Additional documentation • For more information on büS, read the cabling guide that is available at country.burkert.com. • For more information on CANopen that is related to the device, refer to the Operating Instructions "CANopen Network configuration"...

  • Page 33: With Canopen Cables

    Type 8746 Electrical connection If a büS cable from Bürkert is used, then observe the signals of the conductors. Colour of the büS cable conductor Signal 24 V  black white CAN_H blue CAN_L Tab. 4: Signals of the büS cable conductors NOTICE! If an own mating female connector is used, then observe the following requirements for the correct operation of the device.

  • Page 34: Wire The Variant Analogue

    Type 8746 Electrical connection NOTICE! Requirements for the correct operation of the device. ▶ Use a mating female connector with shield connection. ▶ Observe the specifications for the cable and conductors, that are given by the manufacturer of the mating female connector.
  • Page 35 Type 8746 Electrical connection NOTICE! UL approved versions must be supplied in one of the following ways: ▶ "Limited Energy Circuit" (LEC), according to UL / IEC61010-1 ▶ "Limited Power Source" (LPS), according to UL / IEC60950 ▶ SELV / PELV with UL-approved overcurrent protection, designed according to UL / IEC61010-1, Table 18 (e.g.

  • Page 36: Digital Input

    Type 8746 Electrical connection 5-pin M12 female connector Pin Assignment GND for the digital input Digital input + Relay - Reference contact Relay - Normally closed contact (Break contact) Relay - Normally open contact (Make contact) M12 thread is internally con-...

  • Page 37: Relay Output

    Type 8746 Electrical connection Function Level 1 Level 2 Level 3 MFC: Start autotune Triggers the function Not used Not used MFC: Actuator control Triggers the closing of Triggers the normal Triggers the opening of the actuator operation mode the actuator...

  • Page 38: Wire The Variant Industrial Ethernet

    Type 8746 Electrical connection The relay switching can show the following events: • A warning message has been generated. For example if the supply voltage is too high, then a warning message is generated. • A failure message has been generated. For example if a sensor failure is detected, then a failure message is generated.

  • Page 39: Change The Network Parameters

    Type 8746 Electrical connection 5-pin M12 male connector Assignment (A coding) Shielding 24 V Not connected Not connected M12 thread is internally con- Coding lug nected to FE Tab. 13: Pin assignment, 5-pin M12 male connector (A coding) of the device...

  • Page 40: Over The Product Web-Server

    Type 8746 Electrical connection 6.5.1 Over the product web-server NOTICE! Security risk due to default passwords. Unauthorised persons can log in to the web server and change the parameters. ▶ Change the default passwords. ▶ If the web server is not needed, then disable access with the Bürkert Communicator software, refer to Configuration with Bürkert Communicator [} 45]...

  • Page 41: Wire The Variant Profibus

    Type 8746 Electrical connection ▶ Change the parameters. ▶ To update the parameters, restart the device. The device restarts. The network parameters of the device are changed. Wire the variant Profibus Requirements for the correct operation of the device. ▶ Use shielded cables. The cable shielding can be either a braid shielding or a foil shielding.

  • Page 42: Change The Profibus Network Parameters

    Type 8746 Electrical connection 5-pin M12 female connector Pin Assignment RxD / TxD (line A) DGND RxD / TxD (line B) Not connected M12 thread is internally con- Coding lug nected to FE Tab. 16: Pin assignment, 5-pin M12 female connector (B coding) of the device ▶...

  • Page 43: Connect The Functional Earth

    Type 8746 Electrical connection Connect the functional earth WARNING! Risk of ignition and risk of fire that are due to electrostatic discharge. An electrostatic discharge of the device can ignite combustible gas vapours. ▶ To avoid a build up of electrostatic charge, connect the housing to the functional earth.

  • Page 44: Commissioning

    Type 8746 Commissioning Commissioning Risk of injury or material damage when working on the device or system. ▶ Read and observe the chapter Safety [} 8] before working on the device or system. Commissioning procedure ▶ Pressurise the pipes with medium.

  • Page 45: Configuration With Bürkert Communicator

    ▶ Use the USB-büS-Interface set with article number 00772551. ▶ Download the latest version of the Type 8920 Bürkert Communicator from country.burkert.com. ▶ Install the Bürkert Communicator on a PC. During installation, the büS stick must not be inserted at the PC.

  • Page 46: Setting The Industrial Ethernet Address

    ▶ Use the USB-büS-Interface set with article number 00772426. ▶ Download the latest version of the Type 8920 Bürkert Communicator from country.burkert.com. ▶ Install the Bürkert Communicator on a PC. During installation, the büS stick must not be inserted at the PC.

  • Page 47: Functions

    Type 8746 Configuration with Bürkert Communicator Functions 8.4.1 Shut-off threshold Applicable for: • MFC A shut-off threshold ensures the sealing function of the control valve (except valve with PCTFE seat sealing). If the Used set-point value is below the shut-off threshold (Controller > Parameter >...

  • Page 48: Zero Point Adjustment

    Type 8746 Configuration with Bürkert Communicator ▶ Connect the device to the Bürkert Communicator. Refer to Connect to the Bürkert Communicator [} 45] Zero point adjustment It is possible to perform a zero point adjustment procedure to adapt the sensor characteristic curve to the current conditions (mounting/installation position, medium, operating pressure).

  • Page 49: Increase The Data Transmission Speed

    Type 8746 Configuration with Bürkert Communicator Set-point value source Description Operation mode Analog set-point value The set-point value is set through the analogue Normal operation mode source input. (Closed-loop) Only variant Analogue Automatic The set-point value is set via the fieldbus. If dif-...

  • Page 50: Operation Modes

    Type 8746 Configuration with Bürkert Communicator ▶ If the bus load is less than or equal to 45%, then the data transmission-speed can be increased. Do the following procedure: ▶ Select the device. ▶ Go to General settings > Parameter > PDO Configuration.

  • Page 51: Analogue Variant

    Type 8746 Configuration with Bürkert Communicator xout xd = w-x Fig. 18: Function diagram of the MFC with control valve 1 Medium inlet 2 Sensor 3 Control valve 4 Medium outlet 5 Electronics x measured value of the mass flow rate...

  • Page 52: Industrial Ethernet Variant

    Type 8746 Configuration with Bürkert Communicator 8.10.2 Industrial Ethernet variant After applying the operating voltage, the device enters a short initialisation phase and then switches to the Automatic operation mode. ▶ To change the control mode, i. e. to change the source for the set-point values. Refer to Select the source that gives the set-point value [} 52]...

  • Page 53: Set-Point Values Without Communication

    Download the initiation files and the related documentation at country.burkert.com. On a Industrial Ethernet variant it is possible to alternatively change the related object. Refer to the related procedure in the device-specific help in the documentation of the initiation files.

  • Page 54: Changing Between Büs And Canopen Mode

    Type 8746 Configuration with Bürkert Communicator ▶ To use the function, refer to the related procedure in the specific help in the documentation of the initiation files. Download the initiation files and the related documentation at country.burkert.com ▶ The configuration is available under Controller > Parameter > Setpoint > Advanced settings >...

  • Page 55: Maintenance

    Type 8746 Maintenance Maintenance If the device is operated according to the Operating instructions, then the device is maintenance- free. Risk of injury or material damage when working on the device or system. ▶ Read and observe the chapter Safety [} 8] before working on the device or system.

  • Page 56: Calibration

    Type 8746 Maintenance ▶ CAUTION! Before mounting the parts back, make sure that the fine side of the mesh filter [6] faces the flange plate [2] ▶ Push back the compression spring [7] together with the mesh filter [6] into the base block and secure them with the circlip [4].
  • Page 57 Type 8746 Maintenance Inserted memory card Fig. 21: Cross-sectional drawing ▶ With a TX8 screwdriver, screw the cover to a torque of 1.2 N·m (0.9 lbf·ft). ▶ Restart the device to write the data on the new memory card. Possible problems related to the memory card are given in Troubleshooting [} 59]...
  • Page 58 Type 8746 Maintenance Fig. 23: Insertion of the memory card with flat-nose pliers 1 Electronic board 2 Holder of the memory card 3 Contact spring 4 Memory card 5 Flat-nose pliers ▶ After overcoming the force of the spring, insert the memory card vertically.

  • Page 59: Troubleshooting

    Type 8746 Troubleshooting Troubleshooting 10.1 Status indicator is red MFM Analogue The supply voltage is out of the error ▶ Operate the device within the specifications. If the status range. The device can be damaged. indicator is still red, then send the device back to Bürkert.
  • Page 60 Type 8746 Troubleshooting MFM büS/CANopen The supply voltage is out of the error ▶ Operate the device within the specifications. If the status range. The device can be damaged. indicator is still red, then send the device back to Bürkert.

  • Page 61: Status Indicator Is Orange

    Type 8746 Troubleshooting MFC PROFIBUS The supply voltage is out of the error ▶ Operate the device within the specifications. If the status range. The device can be damaged. indicator is still red, then send the device back to Bürkert.
  • Page 62 Type 8746 Troubleshooting MFM PROFIBUS A calibration procedure is in progress. ▶ Wait until the calibration procedure is completed. MFM büS/CANopen The device is connected to büS and ▶ Wait until the device has found assigned fieldbus searches assigned fieldbus participant.

  • Page 63: Status Indicator Is Yellow

    Type 8746 Troubleshooting MFC büS/CANopen The device is connected to büS and ▶ Wait until the device has found assigned fieldbus searches assigned fieldbus participant. participants. The device is connected to büS and is ▶ Wait up to one minute until the device assigns its configured manually, but has no ad- address.
  • Page 64 Type 8746 Troubleshooting MFM büS/CANopen One of the following values is out of ▶ Operate the device within the specifications. If the status specification. The sensor or the device indicator is still yellow, then send the device back to can be damaged.

  • Page 65: Status Indicator Is Blue

    Type 8746 Troubleshooting MFC PROFIBUS One of the following values is out of ▶ Operate the device within the specifications. If the status specification. The sensor or the device indicator is still yellow, then send the device back to can be damaged.

  • Page 66: Status Indicator Is Off

    Type 8746 Troubleshooting 10.5 Status indicator is off Cause Solution The device is not energised. ▶ Make sure that the device is correctly wired. ▶ Make sure that the voltage supply is 24 V  ▶ Make sure that the power supply source is working properly.

  • Page 67: No Mass Flow Rate

    Type 8746 Troubleshooting 10.9 No mass flow rate The pipes are too large or not yet fully ▶ Vent the pipes. vented. ▶ Change the pipe diameter. The flow-rate value is below the cut- ▶ If the cut-off limit is too high, decrease the value of the off limit.

  • Page 68: Set-Point Value At 0 %, But Medium Still Flows

    Type 8746 Troubleshooting Functional earth (FE) is not connected ▶ To connect the functional earth, use a green-and-yellow properly. cable that is as short as possible. And the cable cross- section must be at least equal to the cross section of the power-supply cable.

  • Page 69: Set-Point Value At 0 %, No Mass Flow, But A Non-Zero Mass Flow Rate Is Measured

    Type 8746 Troubleshooting MFC PROFIBUS The operating pressure is above the ▶ Reduce the operating pressure. tight sealing pressure of the control ▶ To eliminate the defect, return the device to the valve. manufacturer. The connected actuator is a propor- ▶...

  • Page 70: Network Status Indicator

    Type 8746 Troubleshooting 10.14 Network status indicator LED indicator Meaning Action Link/Act-LED (green) fast blink- Connection to the parent pro- tocol layer is established. Link/Act-LED (green) slow Connection to the protocol blinking (directly after restart) layer is searched. Link/Act-LED (green) slow No connection to the parent ▶...

  • Page 71: Spare Parts And Accessories

    Type 8746 Spare parts and accessories Spare parts and accessories Risk of injury and/or damage due to incorrect parts. ▶ Use only original accessories and original spare parts from Bürkert. Order the parts directly on our eShop. 11.1 Electrical accessories ▶...
  • Page 72 Type 8746 Spare parts and accessories PROFIBUS variant USB-büS-interface set, without power supply 772551 Straight 5-pin M12 female connector 772416 Bent 5-pin M12 female connector 772418 Memory card On request Connection cable with M12 female connector (A-coded) and free 560365...

  • Page 73: Compression Fittings For A Device With G-Internal-Threaded Connections

    Type 8746 Spare parts and accessories 11.2 Compression fittings for a device with G-internal-threaded connections The threaded pipe-connection plates of the device obey standard DIN ISO 228/1. If the pipe fittings are not delivered with the device, then choose pipe fittings that are adapted to the medium connection of the device.

  • Page 74: Uninstallation

    Type 8746 Uninstallation Uninstallation 12.1 Dismantling ▶ Relieve the medium pressure in the installation. ▶ Flush the device with a neutral medium (for example nitrogen) ▶ Relieve the flushing medium pressure in the installation. ▶ De-energise the device. ▶ Remove the electrical wiring.

  • Page 75: Logistics

    Type 8746 Logistics Logistics 13.1 Transport and storage ▶ Protect the device against moisture and dirt in the original packaging during transportation and storage. ▶ Avoid UV radiation and direct sunlight. ▶ Protect connections from damage with protective caps. ▶ Observe permitted storage temperature.

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