E+E Elektronik EE741 Series User manual

BA_EE741 // v1.7 // Modification rights reserved // 194408
User Manual
EE741
Inline Flow Sensor
for Compressed Air and Gases

E+E Elektronik Ges.m.b.H. doesn't accept warranty and liability claims neither upon this publication nor in case of
improper treatment of the described products.
The document may contain technical inaccuracies and typographical errors. The content will be revised on a
regular basis. These changes will be implemented in later versions. The described products can be improved and
changed at any time without prior notice.
© Copyright E+E Elektronik Ges.m.b.H.
All rights reserved.
EMC note USA (FCC):
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
EMC note Canada (ICES-003):
CAN ICES-3 (A) / NMB-3 (A)

3
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
CONTENT
1 General .................................................................................................................................................4
1.1 Explanation of Symbols.................................................................................................................................4
1.2 Safety Instructions.........................................................................................................................................4
1.2.1 Intended Use........................................................................................................................................................4
1.2.2 Mounting, Start-Up and Operation .......................................................................................................................5
1.3 Environmental Aspects..................................................................................................................................5
2 Scope of Supply ..................................................................................................................................5
3 Product Description ............................................................................................................................6
3.1 Modular Design .............................................................................................................................................7
3.1.1 Changing the Pipe Diameter................................................................................................................................7
3.2 Functions.......................................................................................................................................................8
3.2.1 General ................................................................................................................................................................8
3.2.2 Analogue Output .................................................................................................................................................8
3.2.3 Digital Interface ....................................................................................................................................................9
4 Mechanical Installation .....................................................................................................................10
4.1 Installation Dimensions ...............................................................................................................................10
4.1.1 Installation Dimensions Gauge Mounting Block.................................................................................................10
4.1.2 Installation Dimensions Gauge Mounting Block with Flanges ...........................................................................10
4.2 Choosing the Appropriate Mounting Location .............................................................................................11
4.2.1 Process Pressure............................................................................................................................................... 11
4.3 Installation Position .....................................................................................................................................11
4.4 Inlet and Outlet Measurement Path.............................................................................................................12
4.5 Installation of the Gauge Mounting Block....................................................................................................13
4.5.1 Gauge Mounting Block.......................................................................................................................................13
4.5.2 Gauge Mounting Block with Flanges .................................................................................................................13
4.5.3 Operating the Pipeline without Sensing Unit......................................................................................................13
4.6 Mounting the Sensing unit Unit into the Gauge Mounting Block .................................................................14
5 Electrical Installation ........................................................................................................................15
5.1 Connection Diagram....................................................................................................................................15
5.1.1 Switch and Pulse Outputs Internal Circuit..........................................................................................................15
5.2 Digital Interface ...........................................................................................................................................16
5.2.1 M-Bus (Meter Bus).............................................................................................................................................16
5.2.2 Modbus RTU......................................................................................................................................................17
5.2.3 IO-Link................................................................................................................................................................19
5.3 USB Configuration Interface........................................................................................................................20
6 Display................................................................................................................................................20
6.1 Measured Value Display..............................................................................................................................21
6.2 Display Menu ..............................................................................................................................................21
7 Error Messages .................................................................................................................................23
8 Maintenance.......................................................................................................................................23
8.1 Removing the Sensing unit from the Gauge Mounting Block......................................................................24
8.2 Cleaning the Sensing Head.........................................................................................................................24
9 Ordering Guide for Accessories ......................................................................................................24
10 Technical Data ...................................................................................................................................25
10.1 Factory Settings of the Outputs for DN15 / DN20 / DN25 ...........................................................................26
10.2 Factory settings of the outputs DN32 / DN40 / DN52..................................................................................27
10.3 Works Certificate .........................................................................................................................................28

4User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
1 General
This user manual serves for ensuring proper handling and optimal functioning of the device. The
user manual shall be read before commissioning the equipment and it shall be provided to all
staff involved in transport, installation, operation, maintenance and repair. The user manual may
not be used for the purposes of competition without the written consent of E+E Elektronik® and
may not be forwarded to third parties. Copies may be made for internal purposes. All information,
technical data and diagrams included in these instructions are based on the information available
at the time of writing.
Disclaimer
The manufacturer or his authorized agent can be only be held liable in case of willful or gross
negligence. In any case, the scope of liability is limited to the corresponding amount of the order
issued to the manufacturer. The manufacturer assumes no liability for damages incurred due to
failure to comply with the applicable regulations, operating instructions or the specified operating
conditions. Consequential damages are excluded from the liability.
1.1 Explanation of Symbols
This symbol indicates safety information.
It is essential that all safety information is strictly observed. Failure to comply with this information
can lead to personal injuries or damage to property. E+E Elektronik® assumes no liability if this
happens.
This symbol indicates instructions.
The instructions shall be observed in order to reach optimal performance of the device.
1.2 Safety Instructions
1.2.1 Intended Use
The inline flow sensor (device) is dedicated to the measurement of compressed air and non-
corrosive gases in pipelines. Please consult the manufacturer before employing the device in wet
or dirty gases.
The inline flow sensor consists of a sensing unit and a gauge mounting block. The sensing unit
may only be installed in the appropriate E+E gauge mounting block. It is not permissible to use
the sensing unit without a gauge mounting block.
Due to the design the flow sensor is appropriate for operation in pressurized systems up to 16
bar (232 psi) (PN16).
It is not allowed to operate the EE741 in explosion hazard areas. The surrounding area of the
sensing unit must not be an explosion-hazard area. When used with flammable gases, explosive
atmospheres in the pipeline must be avoided at all times.
Installation, electrical connection, maintenance and commissioning may only be performed by
qualified, trained and authorized staff.
Use other than described in the present operation manual may represent a security risk for
people and the entire measuring chain and is therefore not permitted. The manufacturer may not
be made liable for injuries damages caused by inappropriate or non-intended use or installation.
To prevent safety risks and damages, and assure full functionality of the device, the user
shall strictly observe the start-up, inspection and maintenance steps described in this manual.
Furthermore, the device may not be manipulated in any other way than described in these
operating instructions, and may not be exposed to any excessive mechanical stress.
The flow sensor may be operated only under the ambient conditions as defined in the technical
data sheet. Use under other ambient conditions may lead to device malfunctions.

5
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
1.2.2 Mounting, Start-Up and Operation
The inline flow sensor has been produced under state of the art manufacturing conditions, has
been thoroughly tested and has left the factory after fulfilling all safety criteria.
The manufacturer has taken all precautions to ensure safe operation of the device. The user
must ensure that the device is set up and installed in a manner that does not have a negative
effect on its safe use.
The user is responsible for observing all applicable safety guidelines, local and international,
with respect to safe installation and operation on the device. This operating manual contains
information and warnings that must be observed by the user in order to ensure safe operation.
• Mounting, start-up, operation and maintenance of the device may be performed by qualified
staff only. Such staff must be authorized by the plant operator to carry out the mentioned
activities.
• The qualified staff must have read and understood this operating manual and must follow the
instructions contained within.
• All process and electrical connections shall be thoroughly checked by authorized staff before
putting the system into operation.
• Do not install or start start-up a device supposed to be faulty. Make sure that such devices are
not accidentally used by marking them clearly as faulty.
• A faulty device may only be investigated and possibly repaired by qualified, trained and
authorized staff. If the fault cannot be fixed, the device shall be removed from the system.
• Service operations other than described in this operating manual may only be performed by the
manufacturer.
1.3 Environmental Aspects
Products from E+E Elektronik® are developed and manufactured observing of all relevant
environmental protection requirements. Please observe local regulations for the device disposal.
For disposal, the individual components of the device must be separated according to local
recycling regulations. The electronics shall be disposed of correctly as electronics waste.
2 Scope of Supply
Item 1: EE741:
• EE741 according to ordering guide
• 1 x Allen key
• 1 x USB cable
• M12x1 straight socket, can be assembled
• User manual
• Two self-adhesive labels for configuration changes
(see user guide at www.epluse.com/relabeling)
• Inspection certificate according to DIN EN 10204-3.1
Item 2: Gauge mounting block:
• Gauge mounting block incl. sealing plug

6User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
3 Product Description
The EE741 flow sensor operates on the thermal mass flow measurement principle and is suitable
for measuring the flow of compressed air and gases in pipelines. It can be used for measuring
the consumption of compressed air, nitrogen, argon, oxygen, CO2or other non-corrosive and
non-flammable gases.
The EE741 measures the volume flow under standard conditions. The standard conditions
according to DIN 1343 (1013.25 mbar; 0 °C) are factory-set. Additionally, EE741 measures the
mass flow, the standardized flow and the temperature.
Depending on the ordered version, the EE741 is available either as analogue version with
analogue output (current), switch output and/or pulse output for consumption metering or as
digital version (Modbus RTU, M-Bus or IO-Link).
The analogue version has 2 configurable outputs, output 1 as current or switch output, output 2
as switch or pulse output.
The digital version provides Modbus RTU, M-Bus or IO-Link interface by factory.
The EE741 features an integrated consumption meter. The consumption volume can be shown
on the display and is retained even if the supply voltage is interrupted.
Sensing unit
Display (optional)
Gauge mounting block
Output
• Analogue
• 2 switch outputs
• Pulse output
• Modbus RTU
• M-Bus
• IO-Link
Sensing head
Gauge mounting block
with flanges

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User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
3.1 Modular Design
One and the same sensing unit can be used for each of
three pipe diameters:
EE741: DN15
(1/2") / DN20 (3/4") / DN25 (1")
EE741-N50: DN32 (1-1/4") / DN40 (1-1/2") / DN50 (2")
The pipe diameter is easily changed via the display
menu or the EE-PCS Product Configurator Software
(available for free download at www.epluse.com/
configurator).
In the diameters DN32 (1-1/4") / DN40 (1-1/2") / DN50 (2")
the EE741-N50 can be operated optionally with a gauge
mounting block with flanges.
Once the gauge mounting block is built into the pipeline, the sensing unit can be installed and
removed without disassembling the pipework. As a result, the EE741 is also ideal for temporary
measurement at serveral mounting blocks. The sealing plug included in the scope of supply
enable the normal operation of the compressed air system when the sensing unit is removed.
3.1.1 Changing the Pipe Diameter
Upon delivery, the factory setting of the sensing unit corresponds to the pipe diameter as ordered.
The setting must match the gauge mounting block. For use use with a gauge mounting block of
different diameter, the sensing unit setting shall be correspondingly changed, otherwise it would
lead to relevant measurement errors.
Fig. 1 Pipe diameter on gauge mounting block
Pipe diameter
label
Fig. 2 Pipe diameter on gauge mounting block with flanges
Pipe diameter
label
The pipe diameter setting of the sensing unit can be viewed on the status page of the optional
display and can be changed using the “Pipe diameter” menu, see chapter 6 Display.
The pipe diameter setting can also be viewed and changed using the EE-PCS Product
Configurator Software and via the IO-Link interface.

8User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
3.2 Functions
3.2.1 General
Maximum consumption value on the display
The consumption value on the display is limited at 999 999 999.0 m3. For value above this, the
display shows “LCD maximum”, while internally the consumption is metered normally up the
maximum value of 3.4 * 1038 m3. Values above 999 999 999.0 m3can be read with the EE-PCS
Product Configurator Software.
Setting the Standard Conditions
The standard volume flow calculation is based on the standard conditions stored in the EE741
sensing unit. The factory setting for the standard conditions complies with DIN 1343:
P0= 1013.25 mbar, t0= 0 °C
The standard conditions can be changed via display menu, via EE-PCS Product Configurator
Software or via IO-Link.
Low Flow Cut-Off
Very small (insignificant) flow values can be suppressed by setting a shutdown threshold.
Measured values below the shutdown threshold have no effect on the output signal,
display and consumption meter.
The minimum shutdown value can be set in m³/h or ft³/min.
3.2.2 Analogue Output
Current Output (OUT 1)
The analogue current output (factory setting 4 - 20 mA or 0 - 20 mA) is used for the actual flow
or temperature measured values. The analogue output is freely configurable and scalable via the
display menu or the EE-PCS Product Configurator Software.
The analogue output features an error message function according to NAMUR NE43. In the
event of a faulty sensing head, the output signal will freeze at 21 mA.
Switch (Alarm) Outputs (OUT 1 and OUT 2)
The switch outputs can be set via the display menu or via the EE-PCS Product Configurator
Software. One can select between “hysteresis mode” or “window mode” as well as between
normally closed (NC) or normally open (NO) contact.
NC (normally
closed contact)
NO (normally open
contact)
Switch point
Hysteresis
t
Nm³/h
0
1
0
1
Fig. 3 Hysteresis mode
t
Nm3/h
0
1
0
1
NC (normally
closed contact)
NO (normally open
contact)
Set point high
Hysteresis
high
Hysteresis
low
Set point low
Fig. 4 Window mode
Pulse Output (OUT 2) and Consumption Meter
The EE741 flow sensor features an integrated meter with pulse output, which totalizes the
consumption of compressed air or gas.
With the display menu or the EE-PCS Product Configurator Software, the user can set:
• Pulse duration: 0.02...2 s
• Pulse value: 0.1...1 000 m³
The pulse - pause ratio must be at least 1:2. This means that the time between pulses must be at
least twice the pulse duration.

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User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
The minimum time between two pulses is 2 s.
t
OUT 2
1/3 min. 2/3
≥ 2 s
Fig. 5 Pulse-pause ratio
The pulse duration and the pulse value can be calculated with following MIN/MAX-Formula:
Calculating the min. “pulse value” or the max. “pulse duration”:
IMPW_MIN = NORMV_MAX [m³/h] * IMPL [s] / 1200
IMPL_MAX = IMPW [m³] * 1200 / NORMV_MAX [m³/h]
IMPW pulse value [m³]
IMPL pulse duration [s]
IMPW_MIN min. value for pulse value [m³]
IMPL_MAX max. pulse duration [s]
NORMV_MAX max. expected standard volume flow [m³/h]
The totalized consumption is stored every minute and is retained even if the supply voltage is
interrupted.
The totalized consumption can be shown on the display. A reset of the consumption meter can be
performed via the display menu or the EE-PCS Product Configurator Software.
3.2.3 Digital Interface
The EE741 is available in three different digital interface versions, with Modbus RTU, M-Bus
or IO-Link interface. The Modbus RTU and M-Bus interface parameters can be accessed and
changed with the help of the EE-PCS Product Configurator Software.

10 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
4 Mechanical Installation
4.1 Installation Dimensions
4.1.1 Installation Dimensions Gauge Mounting Block
Gauge
mounting
block
Thread
Rpor NPT
DN15 1/2"
DN20 3/4"
DN25 1"
DN321) 1-1/4ʺ
DN40 1-1/2ʺ
DN50 2ʺ
1) only Rpthread
Internal thread:
Whitworth thread according to
EN 10226 (old DIN 2999) or NPT
Internal thread:
Whitworth thread according to
EN 10226 (old DIN 2999) or NPT
M12 x 1
M12 x 1
50
88,5
84,5
123
100
100
50
80
EE741:
EE741-N50:
4.1.2 Installation Dimensions Gauge Mounting Block with Flanges
EE741-N50:
300 / 11.8
DN32: Ø 140 (5.5) / DN40: Ø 150 (5.9) / DN50: Ø 165 (6.5)
83 (3.3)
DN32: Ø 38 (1.5) DN40: Ø 48.3 (1.9) DN50: Ø 60.3 (2.4)
45°

11
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
4.2 Choosing the Appropriate Mounting Location
• The mounting location site shall be easily accessible and free of vibration.
• A minimum clearance of 150 mm (5.9") shall be observed around the mounting location for
installing / removing the sensing unit of the EE741.
• The ambient temperature shall not exceed the specified limits. Consider also the possible heat
radiation.
• Air (medium) purity at the mounting location shall comply to ISO 8573-1:2010, at least Class
3.4.4.
• The medium and the ambient conditions at the mounting location shall be non-condensing.
• In compressed air networks, EE741 shall be installed after the air dryer. In the absence of a
dryer, EE741 shall be installed after the condensate separator and appropriate filters.
• Observe the flow direction in the pipe.
• Observe the recommended inlet and outlet path length. These are relevant for measurement
accuracy as specified in the EE741 data sheet.
• EE741 shall be located as far as possible from flow disturbances, for instance at an
appropriate distance before valves.
4.2.1 Process Pressure
The pressure in the pipeline may not exceed 16 bar (232 psi).
Before mounting or removing the sensing unit, the pipeline must be depressurised.
Due to its measuring principle, the measurement accuracy of the EE741 is quasi-independent
of the actual process pressure. Besides, the device is factory adjusted at 7 bar (102 psi)
absolute pressure. For normal requirements pressure compensation is not necessary. For best
measurement accuracy, the actual working pressure can be set via display menu, via EE-PCS
Product Configurator Software or via the IO-Link interface.
4.3 Installation Position
The suitability of the following mounting positions must be taken into account for mounting the
EE741 in the gauge mounting block or in the gauge mounting block with flanges.
Vertical mounting
+
Horizontal mounting, sensing unit at top
+
Flow Direction
Flow Direction
Flow Direction
Flow Direction

12 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
Horizontal mounting, sensing unit horizontal
+
Horizontal mounting, sensing unit at bottom
-
Flow Direction
Flow Direction
Flow Direction
Flow Direction
+ ... Recommended installation position
- ...... Not recommended
4.4 Inlet and Outlet Measurement Path
For measurement accuracy according to product specification, the EE741 flow sensor shall
be located as far as possible from flow disturbances caused for instance by pipe reductions
or expansions, bends, T-pieces, valves or sliders. This can be accomplished by observing a
minimum inlet and outlet path length, which depends on both the nature of disturbance and the
pipe diameter. This applies to mounting the EE741 in the gauge mounting block as well as in the
gauge mounting block with flanges.
• The flow sensort shall be located before valves or sliders.
• With light gases the inlet paths need to be extended.
Flow Direction
Pipe diameter (DN)
Outlet path Inlet path
Flow direction
Type (DN = pipe diameter)
Inlet path Outlet path
Extension 15 x DN 5 x DN
Reduction 15 x DN 5 x DN
90° elbow 20 x DN 5 x DN
Two 90° elbows, on
one level 25 x DN 5 x DN
Two 90° elbows, on
two levels, T-piece 30 x DN 5 x DN
Valve, slider 50 x DN 5 x DN

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User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
4.5 Installation of the Gauge Mounting Block
4.5.1 Gauge Mounting Block
The gauge mounting block is symmetrical and can be installed in the pipeline irrespective of the
flow direction.
• All connections must be properly sealed and checked for tightness.
• The thread seals shall not impact on the cross section of the pipe or of the block.
4.5.2 Gauge Mounting Block with Flanges
The gauge mounting block with flanges is symmetrical and can be installed in the pipeline
irrespective of the flow direction. The entire media contacting surface is of stainless steel 1.4404.
• Both connection surfaces of the flanges are to be connected to the pipe system with suitable
seals. (see HA074532, HA074540, HA074550)
• The seals shall not impact the cross section of the pipe or of the block.
• All connections must be properly sealed and checked for tightness before use.
4.5.3 Operating the Pipeline without Sensing Unit
To operate the pipeline without the sensing unit unit, the opening of gauge mounting block which
accommodates the sensing head can be closed using the sealing plug included in the scope of
supply (Fig. 6). The sealing plug has a Tuflok® coating (http://www.bossard.com) and does not
require any additional seal.
Mount the sealing plug with a torque of min. 28 Nm.
Under normal operation with sensing unit installed, the sealing plug shall be placed for safe
keeping into the opening at the side of the gauge mounting block (Fig. 7).
Fig. 6 Gauge mounting block with sealing plug Fig. 7 Sealing plug in park position
Fig. 8 Gauge mounting block with flanges
with sealing plug
Fig. 9 Gauge mounting block with flanges
with sealing plug in park position

14 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
4.6 Mounting the Sensing unit Unit into the Gauge Mounting Block
Depressurize the pipeline before mounting or removing the sensing unit unit.
In case the gauge mounting block has been operated without sensing unit, remove the sealing
plug with a WAF 13 spanner.
Remove the protective cap from the sensing head (Fig. 10) and insert carefully the sensing head
of the sensing unit into the gauge mounting block.
Fig. 10 Remove protective cap
Make sure that the direction arrow on the sensing unit units corresponds to the flow direction in
the pipeline. Failure to comply with this may lead to additional measurement error of ±3 % of the
measured value.
Complete the mounting by tightening the mounting screws with a max. torque of 6 Nm using the
4 mm hex key included in the scope of supply (Fig. 11).
Fig. 11 Tighten mounting screws

15
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
5 Electrical Installation
The electrical installation of the EE741 shall be performed by qualified staff only. Observe all
applicable national and international requirements for the installation of electrical devices as well
as power supply according to EN 50178, SELV, PEL.
5.1 Connection Diagram
Fig. 12 M12 connector
M12 4 pole connector according to
IEC 61076-2-101
Analogue/switch/
pulse output
1...V+
2...Output 1
3...GND
4...Output 2
Modbus RTU
1...V+
2...RS485 A (=D+)
3...GND
4...RS485 B (=D-)
M-Bus
1...V+
2...M-Bus
3...GND
4...M-Bus
1 2
34
M12 connector on
the sensing unit
IO-Link
1...V+ (L+)
2...NC
3...GND (L-)
4...CQ
5.1.1 Switch and Pulse Outputs Internal Circuit
Switch and pulse outputs are NOT potential-free and include internal pull-down resistors (Fig. 13).
V+
GND
GND
10k 10k
OUT 1
OUT 2
Fig. 13 Switch/pulse output

16 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
5.2 Digital Interface
5.2.1 M-Bus (Meter Bus)
The M-Bus (Meter Bus) is a field bus for recording consumption data. Transmission runs serially
on a reverse polarity protected two-wire line. The EE741 flow sensor as M-Bus slave requires
a separate supply voltage. There is no prescribed specific topology (line or star) for the wiring.
Normal phone cable of type J-Y(St)Y Nx2x0.8 mm can be used. The max. cable length per
segment (primary addressed) is 250 m (820 ft).
The table below shows the structure of the consumption data sent by the sensing unit:
Header
68 Start of the telegram
4F 4F L-eld (length)
68 Second starting signal
08 C-eld (RSP_UD)
XX A-eld (address)
Start user data
72 CI-eld (variable data structure)
XX XX XX XX Identication number
A5 16 Manufacturer (0x16A5 … EUE)
01 Version
09 Medium (9 … compressed air)
XX Access number (consecutive)
00 Status
00 00 Signature
Data record 1: Volume ow
05 DIF (32 bit real)
3E VIF (volume ow in m³/h)
XX XX XX XX Cur. measured value
Data record 2: Temperature
05 DIF (32 bit real)
5B VIF (temperature in °C)
XX XX XX XX Cur. measured value
Data record 3: Mass ow
05 DIF (32 bit real)
53 VIF (mass ow in kg/h)
XX XX XX XX Cur. measured value
Data record 4: Consumption meter status
05 DIF (32 bit real)
16 VIF (volumes in m³)
XX XX XX XX Cur. consumption value
Data record 5: Flow velocity
05 DIF (32 bit real)
7F VIF (manufacturer-specic in m/s)
XX XX XX XX Cur. measured value
Data record 6: Volume ow
04 DIF (32 bit integer)
3B VIF (volume ow in 10-³ m³/h)
XX XX XX XX Cur. measured value
Data record 7: Temperature
04 DIF (32 bit integer)
59 VIF (temperature in 10-² °C)
XX XX XX XX Cur. measured value
Data record 8: Mass ow
04 DIF (32 bit integer)
51 VIF (mass ow in 10-² kg/h)
XX XX XX XX Cur. measured value
Data record 9: Consumption meter status
07 DIF (64 bit integer)
13 VIF (volumes in 10-³ m³)
XX XX XX XX
XX XX XX XX
Cur. consumption value
Data record 10: Flow velocity
04 DIF (32 bit integer)
7F VIF (manufacturer-specic in 10-²
m/s)
XX XX XX XX Cur. measured value
End user data
XX Checksum
16 End of telegram
Secondary addressing:
In addition to primary addressing, the EE741 flow sensor provides the option of secondary
addressing. The secondary address uses the fields of identification number, manufacturer,
version and medium. The M-Bus Standard https://m-bus.com/assets/downloads/MBDOC48.PDF
describes the exact sequence of the secondary addressing.
M-Bus setup:
Factory settings Adjustable values
Baud rate 2400 600, 1200, 2400, 4800, 9600
Data bits 8 8
Parity EVEN None, odd, even
Stop bits 11 or 2
Slave address 240 0...254
For several devices on the bus the max. recommended baud rate is 9600.

17
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
5.2.2 Modbus RTU
EE741 flow sensor can be operated in a Modbus RTU network with max. 32 devices. Writing 0
into the corresponding register will reset the MIN/MAX values and the consumption meter.
For Modbus protocol settings see Application Note Modbus AN0103 (www.epluse.com/EE741).
Modbus Map:
Register number1)
[DEC]
Register address2)
[HEX]
Measured value Unit Type
Read registers (function code 0x03 / 0x04)
30501 1F4 Temperature °C 32-bit float
30503 1F6 Temperature °F 32-bit float
30507 1FA Standard flow Nm/s 32-bit float
30509 1FC Standard flow SFPM 32-bit float
30511 1FE Mass flow kg/h 32-bit float
30513 200 Mass flow kg/min 32-bit float
30517 204 Standard volume flow Nm³/h 32-bit float
30519 206 Standard volume flow Nm³/min 32-bit float
30521 208 Standard volume flow l/min 32-bit float
30523 20A Standard volume flow l/s 32-bit float
30525 20C Standard volume flow SCFM 32-bit float
30529 210 Consumption meter status m³ 64-bit-double
30533 214 Consumption meter status ft³ 64-bit-double
31001 3E8 MIN value temperature °C 32-bit float
31003 3EA MIN value temperature °F 32-bit float
31007 3EE MIN value standard flow Nm/s 32-bit float
31009 3F0 MIN value standard flow SFPM 32-bit float
31011 3F2 MIN value mass flow kg/h 32-bit float
31013 3F4 MIN value mass flow kg/min 32-bit float
31017 3F8 MIN value standard volume flow Nm³/h 32-bit float
31019 3FA MIN value standard volume flow Nm³/min 32-bit float
31021 3FC MIN value standard volume flow l/min 32-bit float
31023 3FE MIN value standard volume flow l/s 32-bit float
31025 400 MIN value standard volume flow SCFM 32-bit float
31501 5DC MAX value temperature °C 32-bit float
31503 5DE MAX value temperature °F 32-bit float
31507 5E2 MAX value standard flow Nm/s 32-bit float
31509 5E4 MAX value standard flow SFPM 32-bit float
31511 5E6 MAX value mass flow kg/h 32-bit float
31513 5E8 MAX value mass flow kg/min 32-bit float
31517 5EC MAX value standard volume flow Nm³/h 32-bit float
31519 5EE MAX value standard volume flow Nm³/min 32-bit float
31521 5F0 MAX value standard volume flow l/min 32-bit float
31523 5F2 MAX value standard volume flow l/s 32-bit float
31525 5F4 MAX value standard volume flow SCFM 32-bit float
Write registers (function code 0x06)
60001 0 Reset MIN value temperature 16-bit integer
60002 1 Reset MIN value standard flow 16-bit integer
60003 2 Reset MIN value mass flow 16-bit integer
60004 3 Reset MIN value standard volume flow 16-bit integer
60005 4 Reset MAX value temperature 16-bit integer
60006 5 Reset MAX value standard flow 16-bit integer
60007 6 Reset MAX value mass flow 16-bit integer
60008 7 Reset MAX value standard volume flow 16-bit integer
60009 8 Reset consumption meter 16-bit integer
1) Register number starts from 1
2) Register address starts from 0
Modbus setup:
Factory settings Adjustable values
Baud rate 9600 9600, 19200, 38400
Data bits 8 8
Parity EVEN None, odd, even
Stop bits 11 or 2
Slave address 240 1...247

18 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
The recommended baud rate for several devices in the Modbus RTU network is 9600.
Device address, baud rate, parity and stop bits can be set via:
1. EE-PCS, Product Configuration Software and USB configuration interface (see chapter 5.3).
The EE-PCS can be downloaded free of charge from www.epluse.com/configurator
2. Modbus protocol in the register 60001 (0x00) and 60002 (0x01).
See Application Note Modbus AN0103 (available on www.epluse.com/EE741)
The serial number as ASCII-code is located at read register address 30001-30008 (16 bits per
address).
The firmware version is located at register address 30009 (bit 15...8 = major release; bit 7...0 =
minor release). The sensor name is located at register address 30010.
Please note: When reading the serial number or the sensor name, it is always necessary to read
all 8 registers, even if the desired information requires less.
Please note: For obtaining the correct floating point values, both registers have to be read
within the same reading cycle. The measured value can change between two Modbus requests,
therefore exponent and mantissa may get inconsistent.
Communication settings (INTEGER 16 bit)
Parameter Register number1) [DEC] Register address2) [HEX]
Write register: function code 0x06
Slave ID (Modbus address) 1 0x00
Modbus protocol settings3) 2 0x01
1) Register number starts from 1.
2) Register address starts from 0.
3) For Modbus protocol settings see Application Note Modbus AN0103 (available at www.epluse.com/EE260).
INFO (read register)
Parameter Register number1) [DEC] Register address2) [HEX]
Read register: function code 0x03 / 0x04
Serial number (as ASCII) 1 0x00
Firmware version 9 0x08
Sensor Name 10 0x09
1) Register number starts from 1.
2) Register address starts from 0.
Bus termination resistor:
Bus termination is required for the last flow sensor in a Modbus RTU network. The 120 Ohm
termination resistor is located behind the blind of the USB port and can be switched on and off
(see Fig. 14).
Fig. 14 Bus termination resistor

19
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
5.2.3 IO-Link
Communication specification
Manufacturer ID 0563hex / 1379dec
Device IDs
EE741 DN15 to DN25: EE741 DN15 to DN25 : 0x074111 475409 d
EE741 DN32 to DN50: EE741 DN32 to DN50 : 0x074112 475409 d
Bitrate COM2 (38.4 kBaud)
Minimum cycle time 6.0 ms
SIO mode supported no
Process data input length 12 bytes
IO-Link Revision 1.1
Required masterport class A
Structure of process data input
The Process Data Input (the measured data of EE741) is configurable and structured in the
following order:
Bit no. 95 64 63 32 31 0
Process data input Measurand 1 Measurand 2 Measurand 3
Measurand index,
factory default
acc. to Tab. 2
80
Mass ow m'
[kg/h]
83
Standard volume ow V'n
[m3/h]
1
Temperature T
[°C]
Tab. 1 Scheme of process data input
Per factory default, the measurands’ data type is FLOAT32 (more exactly, 32-bit single precision
float). The parameters may freely be selected via IO-Link device parameter, the most usual are
pre-selected per default. See Tab. 2 for the supported measurands.
Alternatively, the measured data may be represented as INTEGER32 within the above scheme,
the values are scaled with a factor 1 000 in this case.
Please note that the data type selection (FLOAT32 or INTEGER32) applies to the entire 12 byte
process data input, i.e., all 3 measureands will have the same data type at the same time.
Measurand description Formula sign Unit Measurand index
Temperature T
°C 1
°F 2
K 4
Standard ow vn m/s 22
ft/min 23
Mass ow m'
kg/h 80
kg/min 81
kg/s 82
Standard volume ow V'n
m3/h 83
m3/min 84
SLPM 85
l/s 86
SCFM 87
m3/s 88
Consumption Qn m391
ft393
Tab. 2 Indices of supported measurands

20 User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
5.3 USB Configuration Interface
The micro USB port is located behind a blind cover (Fig. 15 and Fig. 16)
Blind coupling USB cable
Fig. 15 Remove the blind cover Fig. 16 Plug in the USB cable
For EE741 setup and configuration via USB interface it is necessary to install the EE-PCS
Product Configuration Software on a personal computer. EE-PCS is available for free download
at www.epluse.com/EE741. When an adjustment is performed using the EE-PCS, a suitable air
velocity / temperature reference has to be used.
6 Display
The LCD-display (optional) shows the actual measured values and the overall consumption. The
complete EE741 setup and configuration can be performed with the control keys and intuitive,
self explanatory menu guidance.
If the settings are changed during operation, it may affect the function of the system. Ensure that
it will not result in any system malfunctions.
The display orientation can be changed in 90° steps via the settings menu to match the mounting
position of EE741 (Fig. 17 and Fig. 18).
Fig. 17 Horizontal display Fig. 18 Vertical display