Burkert 8741 Mass Flow Controller Data Sheet
Burkert 8741 is a versatile device capable of controlling and measuring gas flow rates with high accuracy and fast response times. It can be configured as either a mass flow controller (MFC) or a mass flow meter (MFM), and up to four different gas calibrations can be stored in the device. The integrated PI controller ensures outstanding control characteristics, and the direct-acting proportional valve provides high sensitivity. Burkert 8741 is suitable for a wide range of applications, including industrial automation, laboratory equipment, and medical devices.
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DATA SHEET
Type 8741
Mass Flow Controller (MFC)/ Mass Flow Meter (MFM) for Gases
• Nominal flow ranges from 0.010 l
N
/min to 160 l
N
/min
• High accuracy and repeatability
• Very fast response times
• Easy device exchange through configuration memory
• Optional: USP Class VI, FDA, EG 1935 conformity
Product variants described in the data sheet may differ from the product presentation and description.
Can be combined with
Type 6011
Plunger valve 2/2 way direct-acting
Type 6013
Plunger valve 2/2 way direct-acting
Type 6027
Direct-acting 2/2 way plunger valve
Type 0330
Direct-acting 2/2 or
3/2-way pivoted armature valve
Type ME43
Fieldbus gateway
Type description
The mass flow controller (MFC) / meter (MFM) Type 8741 for gases is suitable for a wide range of applications and available with Industrial Ethernet, ana logue or fieldbus interfaces. The version with CANopen based Bürkert system bus (büS) is suitable for the integration into existing CANopen networks, as well as Industrial Ethernet or fieldbus networks in combination with the fieldbus gateway of Type ME43. The second option is tailor-made for applica tions with many control loops. Up to 32 MFC / MFM can be connected to one fieldbus gateway. Type ME43 translates the internal CANopen based com munication to industry standards for both Industrial Ethernet and fieldbuses.
The mass flow controller / meter can always be switched between büS and
CANopen communication.
Type 8741 can be configured as MFM or MFC. Optional, up to four different gases calibrations can be stored in the device. The thermal MEMS sensor is located directly in the gas stream and therefore reaches very fast response times. A direct-acting proportional valve as regulating unit guarantees high sensitivity. The integrated PI controller ensures outstanding control character istics of the MFC / MFM.
1000222224 | Standard | EU | en | 202106 | 22
© Christian Bürkert GmbH & Co. KG, Subject to alteration
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Type 8741
Table of contents
4. Device / Process connections 11
5. Performance specifications 13
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Type 8741
1. General technical data
Product properties
Materials
Body
Housing
Seal
Dimensions
Total weight
Protection class
Aluminium or stainless steel
PC (Polycarbonate)
FKM or EPDM (dep. on gas)
Detailed information can be found in chapter
Approx. 500 g (aluminium body)
IP20
Configuration memory (included in delivery) Industrial µSIM card for ease of replacement
Device status
Electrical data
RGB-LED based on NAMUR NE107
Power Supply 24 V DC
Voltage tolerance
Residual ripple
Power consumption 1.)
± 10 %
± 2 %
1 … 3 W (as MFM)
Max. 3…19.5 W (as MFC, depending on type of solenoid control valve)
Electrical connection (options)
Industrial Ethernet
Fieldbus
Analogue
PROFINET, Ethernet/IP, EtherCAT, Modbus-TCP via 2 x RJ45 (Switch) 2.) büS (CAN-based Bus) / CANopen via terminal block, 4 pin
4 … 20 mA, 0 … 20 mA, 0 … 10 V or 0 … 5 V via D-Sub 9 3.) or terminal block 6 pin
Input impedance > 20 kΩ (voltage) or < 300 Ω (current)
Max. Current: 10 mA (voltage output); Max. Load: 600 Ω (current output)
Performance data
Nominal flow range (Q nom
Turn-down ratio
)
Max. operating pressure
(overpressure to the atmospheric pressure)
Measuring accuracy
Repeatability
10 ml
N
/min to 160 l
N
1:50, optional 1:100
± 0.1 % F.S.
/min (N
2
)
10 bar (145 psi), for MFCs the max. operating pressure depends on the medium and the nominal valve size
± 0.8 % o.R. ± 0.3 % F.S. (after 1 min. warm up time)
Settling (MFC) /response (MFM) time (t
95 %
Control valve (proportional valve)
) < 300 ms
Normally closed
Valve orifice range 0.05…8 mm
0.00006…1.1 m 3 /h K
VS
value range
Medium data
Operating medium
Calibration medium
Medium temperature
Product connections
Port connection
Environment and installation
Ambient temperature
Installation
Accessories
Software
Neutral, non-contaminated gases, others on request
Operating gas or air
- 10 °C … + 70 °C (- 10 °C … + 60 °C with oxygen)
NPT ¼, G ¼, flange, clamp ring or vacuum fitting, others on request
- 10 … + 50 °C (higher temperatures on request)
Horizontal or vertical
Bürkert Communicator
1.) Data refers to the typical power consumption (at 23 °C ambient temperature, nominal flow rate and 30 min. control mode). The specifications according to UL 61010-1 can differ (see instruction manual).
2.) Supply voltage via separate terminal block
3.) The analogue version with D-Sub 9 features an additional digital input and a relay output
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Type 8741
2. Approvals
Note:
• The approvals and conformities listed below must be stated when making enquiries. This is the only way to ensure that the prod uct complies with all required specifications.
• Not all available types can be supplied with the above approvals or conformities.
Approvals Description
UL Listed according to DIN EN 61010-1 for USA and Canada
Conformity
FDA
Description
Conformity of all materials in contact with the medium
USP Class VI Kapitel “87 in vitro” and “88 in vivo, Implantation” – Code of Federal Regulations Title 21
Paragraph 177 (CFR 21 177.2600)
Description
Conformity of all materials in contact with the medium
FDA – Code of Federal Regulations Title 21 Paragraph 177 (CFR 21 177.2600)
Description
Conformity of all materials in contact with the medium
Regulation (EC) No 1935/2004 on materials and objects intended to come into contact with food
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Type 8741
3. Dimensions
3.1. Analogue or Industrial Ethernet
MFM or MFC with internal valve (Type 2871)
2x M4x10
28
Socket
A
33.5
Sub-base version of MFM or MFC with internal valve (Type 2871)
4 x 4.5 58.5
17.75
14
0
14
17.75
0 11
Sub-base
43
R27.6
37
29
0
111.6
108
3.5
5.9
3.5
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Type 8741
MFC with external valve (Type 2873)
33.5
13.5
0 11
2 x M4 10
181
approx. 26
3.5
7.9
3.5
MFM for large nominal flow rates
4 x M4 10
40 48
R27.6
145
Ø A
48
Socket C5
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Type 8741
MFC with external valve (Type 2873) for large nominal flow rates
4 x M4 10
R27.6
C5 with valve 2873
199
approx. 14
MFC with external valve (Type 2875) for large nominal flow rates
4 x M4 10
Ø A
48
C5 with valve 2875
R27.6
218
approx. 13 Ø A
48
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Type 8741
3.2. 8741 büS/CANopen
MFM or MFC with internal valve (Type 2871)
2 x M4 6
28
A
A: G1/4 or NPT1/4, depth 12 mm
84.5
70.2
63.8
57.5
29
0
R67.4
111
Sub-base version of MFM or MFC with internal valve (Type 2871)
4x Ø 4.5
17.75
14
0
14
17.75
58.5
2x Ø 8.8
2x Ø 6
92 97
43
28
84.5
70.2
63.8
57.3
29
0
6
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R67.4
111
8 | 18
Type 8741
MFC with external valve (Type 2873)
2 x M4 6
A
87.2
84.5
70.2
63.8
57.5
29
0
MFM for large nominal flow rates
4 x M4 10
40 48
R67.4
145
Ø A
48
94
79.7
73.3
67
38.5
34
0
181
approx. 26
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Type 8741
MFC with external valve (Type 2873) for large nominal flow rates
4 x M4 10
C5 with valve 2873
approx. 14
199.16
MFC with external valve (Type 2875) for large nominal flow rates
4 x M4 10
Ø A
96.7
94
73.3
67
38.5
34
0
217.65
approx.
12.5
C5 with valve 2875
Ø A
96.7
94
79.7
73.3
67
38.5
34
0
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Type 8741
4. Device / Process connections
4.1. büS / CANopen
Terminal block, 4 pin
2
3
Pin
1
4
Assignment
DGND
CANL
CANH
+ 24 V DC
1 2 3 4
Screw M3
Functional earth
When using Bürkert büS cables, the following colour coding applies:
• Red + 24¿ V DC
• Blue CANL
• White CANH
• Black GND
4.2. Industrial Ethernet
Terminal block, 3 pin
2
3
Pin
1
Assignment
FE (functional earth)
DGND
+ 24 V DC
1 2
RJ45 Socket
3
8
7
6
5
4
3
2
1
6
7
4
5
2
3
Pin
1
Assignment
TX +
TX -
RX +
Not connected
Not connected
RX -
Not connected
8 Not connected
Body Shield
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Type 8741
4.3. Analogue
8
9
6
7
D-Sub 9 pin, plug
1
2
3
4
5
Pin
1
2
5
6
3
4
Assignment
Digital input
GND (For supply voltage and digital input)
+ 24 V DC
Relay - Opener
Relay - Reference contact
Set value input +
7
8
Set value input GND
Actual value output
9 Actual value output GND
Body Shield
Terminal block 6 pin
3
4
1
2
5
6
4
5
2
3
Pin
1
6
Assignment
+ 24 V DC
GND
Set value input +
Set value input GND
Actual value output +
Actual value output GND
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Type 8741
5. Performance specifications
5.1. Pressure loss diagram of the MFM
The diagram shows an example of the pressure loss characteristics when air flows through. To determine the pressure loss of another gas, the corresponding air equivalent must first be calculated and the basic fluidics used for the other gas taken into account.
Chip Sensor up to 160 l
N
/min
170.00
160.00
150.00
140.00
130.00
120.00
110.00
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0
Sub-base
10 20 30 40 50 60 70 80
G3/4
G1/4
Sub-base
G3/8
90 100 110 120 130 140 150 160
Q [l
N
/min]
5.2. Flow characteristic
Nominal flow range of typical gases
Note:
All values refer to 1.013 bar(a) and 0 °C (Index N)
Gas
Argon
Acetylene
Helium
Carbon dioxide
Air
Methane
Oxygen
Nitrogen
Hydrogen
Propane
Min. Q nom
0.01
[l
N
/min]
0.01
0.01
0.02
0.01
0.01
0.01
0.01
0.01
0.03
Max. Q nom
160
[l
N
/min]
65
1000
80
160
160
160
160
1000
44
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Type 8741
6. Product operation
6.1. Measuring principle
The actual flow rate is detected by a sensor. This operates according to a thermal principle which has the advantage of providing the mass flow which is independent on pressure and temperature.
A small part of the total gas stream is diverted into a small, specifically designed bypassing channel which ensures laminar flow conditions. The sensor element is a chip immersed into the wall of this flow channel. The chip, produced in MEMS technology, contains a heating resistor and two temperature sensors (thermopiles) which are arranged symmetrically upstream and downstream of the heater. The differential voltage of the thermopiles is a measure of the mass flow rate passing the flow sensor. The calibration procedure effectuates a unique assignment of the sensor signal to the total flow rate through the device.
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Type 8741
7. Product accessories
7.1. Bürkert Communicator Software
Note:
To install the software, click here .
Part of Bürkert’s EDIP program (Efficient Device Integration Platform) is the Bürkert Communicator. This software can be run under
MS-Windows and it is available on Bürkert’s website for free. The Bürkert Communicator allows convenient system configuration and parametrisation of all connected field devices. An accessory part, the büS-stick serves as the interface between computer and process instruments (see
„8.4. Ordering chart accessories“ on page 16
). It transfers “USB data” to “CAN data”. The Communi cator allows:
• Diagnosis
• Parametrization
• Registration and storage of process data
• To watch graph of process
• To update firmware of the büS device connected
• Guided re-calibration
Type 8741 connection with Bürkert Communicator software
The interface to the “Bürkert Communicator” software tool is based on CANopen. The appropriate bus termination is mandatory.
Hence, please activate, for Type 8741 with analogue or Industrial Ethernet interface, the termination resistor switch on the büS-stick.
For Type 8741 büS / CANopen, this termination resistor should not be activated, in case the device is already integrated in a properly terminated bus network
To connect the MFC / MFM with the “Bürkert Communicator” software tool, you need a büS-stick. The büS-stick sets contain the necessary accessories.
• For Type 8741 büS / CANopen, the connection is made directly via the 4 pin terminal block (büS-stick Set 1 contains the neces sary accessories).
• For Type 8741, with analogue or Industrial Ethernet, the connection is made via the micro-USB socket on the device (büS-stick
Set 2 contains the necessary accessories).
ATTENTION: No external power supply may be connected to the micro-USB socket! The power supply to the unit must be provided
as described in chapter „4. Device / Process connections“ on page 11
.
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Type 8741
7.2. Web server for Industrial Ethernet versions
The Industrial Ethernet based devices (with the exception of the EtherCAT protocol) from software version A.13.00.00 have an integrated web server. This can be accessed via a web browser by entering the IP address of the device (factory setting IP
192.168.1.100).
8. Ordering information
8.1. Bürkert eShop – Easy ordering and quick delivery
Bürkert eShop – Easy ordering and fast delivery
You want to find your desired Bürkert product or spare part quickly and order directly?
Our online shop is available for you 24/7. Sign up and enjoy all the benefits.
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8.2. Advice on product choice
Note:
The product questionnaire form on last page
contains the relevant fluid specification. Using the experience of Bürkert engineers already in the design phase provide us with a copy of the request containing the necessary data together with your inquiry or order.
For the proper choice of the actuator orifice within the MFC, not only the required maximum flow rate Q ues directly before and after the MFC (p
, but also the pressure val-
should be known. In general, these pressures are not the same as the overall inlet and outlet pressures of the whole plant, because usually there are additional flow resistors (tubing, additional shut-off valves, nozzles etc.) present both before and after the controller.
Please use the product questionnaire form on last page to indicate the pressures directly before and after the MFC. If these are unknown or not accessible to a measurement, estimates are to be made by taking into account the approximate pressure drops over the flow resistors before and after the MFC, respectively, at a flow rate of Q p
1
1
, p
2
) at this flow rate Q nom nom nom
. In addition, please quote the maximum inlet pressure
max. to be encountered. This data is needed to make sure the actuator is able to provide a close-tight function within all the spec ified modes of operation.
8.3. Bürkert product filter
Bürkert product filter – Get quickly to the right product
You want to select products comfortably based on your technical requirements?
Use the Bürkert product filter and find suitable articles for your application quickly and easily.
Try out our product filter
8.4. Ordering chart accessories
Description büS-stick Set 1 (incl. cable (M12 and Micro-USB), büS-stick with integrated terminating resistor, pow er supply and other accessories) büS-stick Set 2 (incl. cable (M12 and Micro-USB) and büS-stick with integrated terminating resistor)
Power supply Type 1573 for rail mounting, 100 … 240 V AC/ 24 V DC, 1.25 A, NEC Class 2 (UL 1310)
Power supply Type 1573 for rail mounting, 100 … 240 V AC/ 24 V DC, 1 A, NEC Class 2 (UL 1310)
Power supply Type 1573 for rail mounting, 100 … 240 V AC/ 24 V DC, 2 A, NEC Class 2 (UL 1310)
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Article-No.
772426
772551
772438
772361
772362
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Type 8741
Description
Power supply Type 1573 for rail mounting, 100 … 240 V AC/ 24 V DC, 4 A
µSIM-card (included in delivery of MFC)
LabVIEW device driver (for büS / CANopen version)
Device description files for CANopen (EDS), PROFINET (GSDML), Ethernet/IP (EDS), EtherCAT (ESI)
Bürkert Communicator Software
For 8741 büS / CANopen
Terminal block 4 pin (included in delivery)
Terminal block 4 pin with integrated 120 Ohm resistance for büS-ending büS cable, 50 m büS cable, 100 m
Fieldbus Gateway Type ME43 for Industrial Ethernet (PROFINET, Ethernet/IP, Modbus/TCP, EtherCAT)
Fieldbus Gateway Type ME43 for PROFIBUS DPV1
For 8741 Analogue
Terminal block 6 pin (for 8741 Standard; included in delivery of the corresponding analogue version)
Connector cable D-Sub 9 to leads, 5 m
Connector cable D-Sub 9 to leads, 10 m
Article-No.
772363
on request on request
Download from www.burkert.com
Download from www.burkert.com
565876
566066
772413
772414
307390
307393
on request
580882
580883
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Credits, © and concept: Christian Bürkert GmbH & Co. KG | Photographs: Marc Eggimann Fotografie - 4051 Basel | Scanner GmbH - Werbeagentur Künzelsau -
74653 Künzelsau
Product Enquiry Form
Mass Flow Controller for gases
Product Enquiry Form - Mass Flow Controller For Gases
Thank you for your interest in our products! In order to provide you with optimum advice, please fill out the following form and send it to your Bürkert representative or e-mail address: [email protected]
. All information submitted will of course be kept strictly confidential.
Please fill in the required fields ! *
*Note: The interactive functions of this PDF may be restricted depending on the PDF reader used.
Personal Information
Company
Customer no.
Street
Telephone no.
Delivery
MFC Application MFM Application
Contact person
Department
Postcode / Town
Quantity Required delivery date
Medium data
Type of gas or gas mixture
Medium temperature
Ambient temperature
ºC / ºF
ºC / ºF
Fluidic data
Flow range Q
Nom
Inlet pressure at Q
Nom
2.)
Outlet pressure at Q
Max. inlet pressure
Port connection
Nom
Min. Max. unit
Ref. N 1.) Ref. S 1.) p
1
= p
2
= p
1max
=
barg
barg
barg
3.)
3.)
3.)
Compression fitting Subbase Vacuum fitting
Thread: G (DIN ISO 228/1) NPT (ANSI B1.2)
¼" ⅜" ½" ¾" 1"
Installation
horizontal, valve upright vertical, upward flow
horizontal, valve horizontal vertical, downward flow 4.)
1.) Reference conditions: Ref. N: T=0°C, P=1,013 bar(a); Ref. S: T=20°C, P=1,013 bar(a)
2.) Corresponds to the calibration pressure
3.) Please indicate all pressure values as overpressure to atmospheric pressure [barg] (g = relative pressure)
4.) Possible reduction of the setting range to 1:10 for a vertical downwards flow
Material specifications
Body
Seals
Electrical data
IP protection
Control / Communication
Note:
Please choose one of the following op tions!
Aluminium Stainless steel
FKM EPDM
Industrial Ethernet
PROFINET
Ethernet IP
Modbus TCP
EtherCAT
(RJ45 always standard) Connection
Note:
Please choose one of the following op tions!
Yes (IP65) No (IP20 or better)
Normsignal CANopen/büS
0 … 5 V
0 … 10 V
0 … 20 mA
CANopen
büS
PROFIBUS DP
4 … 20 mA
D Sub socket
Terminal block
M12 socket
Terminal block
D Sub socket
M12 socket
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Product Enquiry Form
Mass Flow Controller for gases
Approvals / Conformities
UL
ATEX II Cat. 3 G/D, IECEx
USP Class VI conformity
FDA conformity
EG 1935/2004 conformity
Additional Requirements / Comment
Send form Delete form
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