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EE741
Modular, compact, inline ow meter
for compressed air and gases
The EE741 inline flow meter is dedicated for accurate metering
and monitoring of compressed air and technical gases in DN15
to DN50 pipes.
The thermal measuring principle and the well-proven E+E hot film
sensor element lead to best long-term stability and fast response
time.
Outstanding measuring accuracy, even in the lower measuring
range is achieved by an application-specific multi-point factory
adjustment performed at 7 bar (102 psi). This allows reliable leak
detection and corresponding energy savings.
The construction of the EE741 is optimized for easy installation
and maintenance.
The EE741 is user configurable and can be easily adapted to any measuring task. The setup can be set using either
display and push buttons or the free product configuration software EE-PCS.
Typical applications
EE741
• Compressed air consumption measurement
• Monitoring of technical gases O
Features
Transmitter
» For each three pipe diameters
» Installation and removal without dis-
assembling the pipework facilitatesregular calibration
» Application-specific adjustment
under pressure for best accuracy
Sensor head and thermal ow sensor
» Robust design in stainless steel
» Very short response time
» Wide measuring range
» Long-term stable and accurate
» Negligible pressure drop
» Highly insensitive to contamination
» No additional pressure and
temperature compensation required
Gauge mounting block
» Precise and reproducible positioning
of the transmitter for best accuracy
» Aluminum or stainless steel
» Can be operated with sealing plug
also without transmitter
, N2, Ar, CO2 and other
2
• Nitrogen generators
• Leak detection
Display
» Shows instantaneous values and
overall consumption
» Intuitive device setup with push-
buttons
» Can be rotated in 90° increments
Output
» User configurable via display or PC
» 0-20 / 4-20 mA output
» Two switch outputs
» Pulse output
» Modbus RTU
» M-Bus
Measurands
» Standard volume flow
» Mass flow
» Standard flow
» Temperature
» Integrated consumption meter
(totalisator) for cost-effective
consumption analysis without
additional datalogger
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Modular design
One and the same transmitter 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
Configurator software.
Once the gauge mounting block is built into the pipeline, the transmitter
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 transmitter is removed.
Display (optional)
The state-of-the-art LCD shows the current measured values and the
overall consumption. The user specific device setup can be easily
performed with the push buttons and intuitive menu guidance.
The display can be rotated in 90° increments with a push button for
convenient orientation in any mounting position of the flow meter.
The EE741 without display can be configured by the user via USB
interface with the free EE-PCS product configuration software.
Connection diagram
34
1 2
M12 plug on device
Output 1: Analogue [mA] or switch
Output 2: Pulse or switch
The output signal is freely selectable and configurable.
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 / Meter-bus
1...V+
2...M-Bus
3...GND
4...M-Bus
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Technical data
Measured values
Flow
Measurands m
Standard conditions (factory setting) 1013.25 mbar
Measuring range in air
DN20 (3/4”): 0.4...135.7 Nm3/h (0.24...79.77 SCFM)
DN25 (1”): 0.6...212 Nm3/h (0.36...124.71 SCFM)
DN32 (1-1/4“): 0.9...347.4 Nm3/h (0.52...202.06 SCFM)
DN40 (1-1/2“): 1.4...542.8 Nm
DN50 (2“): 2.2...848.2 Nm
Accuracy2) in air at 7 bar (102 psi) (abs) and 23 °C (73 °F) ± (3 % of measured value + 0.3 % of full scale)
Temperature coefficient ± 0.25 % of the measured value / °C deviating from 23 °C
Pressure coefficient3) + 0.5 % of the measured value / bar deviating from 7 bar (102 psi)
Response time t90 < 2 sec.
Measuring rate 0.1 sec.
Temperature
1)
DN15 (1/2”): 0.2...76.3 Nm3/h (0.12...44.88 SCFM)
Measuring range -20...60 °C (-4...140 °F)
Accuracy at 20 °C (68 °F) and flow >0.5 Nm/s ± 0.7 °C (1.26 °F)
Outputs
Analogue output (scalable) 0 - 20 mA / 4 - 20 mA RL<500 Ohm
Switch output DC PNP, max. 100 mA, V
Configurable: N/C or N/O, hysteresis, window
Pulse output Consumption meter, pulse length 0.02...2 sec.
Bus-interface Modbus RTU (max. 32 units in one bus) or
M-BUS (Meter-Bus)
Configuration interface USB
General
Supply voltage 18 - 30 V DC
Current consumption (max.)
with display I
without display I
Operating pressure (max.) 16 bar
Ambient temperature
with display 0...50 °C
without display -20...60 °C (-4...140 °F)
Medium and storage temperature -20...60 °C (-4...140 °F)
Humidity 0…100 % RH, non-condensing
Medium Compressed air or none corrosive gases
Electrical connection M12x1 4 pol. plug
Electromagnetic compatibility EN61326-1 EN61326-2-3
Industrial environment
Material
Enclosure Polycarbonate
Sensor head / sensor element Stainless steel 1.4404 / glass
Gauge mounting block Aluminium anodized or stainless steel 1.4404
Enclosure protection class IP65
1) Factory setting of the output see manual.
2) The tolerance specifications include the uncertainty of the factory calibration with a coverage factor k=2 (2 x standard deviation). The tolerance was calculated in accordance
with EA-4/02 following the GUM (Guide to the Expression of Uncertainty in Measurement).
3) The flow meter is factory adjusted at 7 bar (102 psi) (abs). At operating pressure other than 7 bar (102 psi) (abs), the error can be corrected by entering the actual system pressure via display menu or with EE-PCS configuration software.
3
/h, m3/min, l/min, l/s, kg/h, kg/min, m/s, SCFM, ft/min, °C, °F
≤120 mA (P
max
≤60 mA (P
max
(232 psi)/ PN16
(32...122 °F)
(14.7 psi), 0 °C (32 °F) (configurable)
3
/h (0.81...315.71 SCFM)
3
/h (1.22...493.35 SCFM)
<2.5 V, 10 kOhm Pull-down
drop
≤2,5 W)
max
≤1,6 W)
max
(73 °F)
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Dimensions (mm/inch)
EE741:
M12 x 1M12 x 1
100 / 3.94
EE741-N50:
50 / 1.97
50 / 1.97
84.5 /3.33
Internal thread:
Whitworth thread
according to EN 10226
(old DIN 2999) or NPT
Mounting
block
DN15 1/2"
DN20 3/4"
DN25 1"
1)
DN32
DN40 1-1/2”
DN50 2”
Rp or NPT
1-1/4”
1) only Rp thread
Thread
123 /4.84
Internal thread:
Whitworth thread
according to EN 10226
(old DIN 2999) or NPT
Modbus Map
88.5 / 3.48
100 / 3.94
1)
80 / 3.15
The flow meter 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).
Read Registers (Function Code 0x03 / 0x04)
Register [DEC]
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
1) Complete Modbus Map see operating instructions.
Protocol address [HEX]
Muasured value Unit Type
Data transmission
Baud rate 9600 9600, 19200, 38400
Data bits 8 8
Parity EVEN None, Odd, Even
Stop bits 1 1 oder 2
Slave addresse 240 1...247
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Factory setting Adjustable values
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Ordering information
A complete flow meter consists of a transmitter (Item 1) and a gauge mounting block (Item 2).
Item 1 - Transmitter EE741-
Pipe diameter / Type
Output
Display Without display no code
Hardware
Cleaning
Factory setting
pipe diameter
(selectable)
2)
Output 1
2)
Output 2
Measurand output 1
2)
Software configuration
Measurand output 2
2)
Unit for process parameters
3)
Medium
Item 2 - Gauge mounting block
Aluminum gauge mounting block
Stainless steel gauge mounting block
Stainless steel gauge mounting block
for oxygen
1) The parts of the transmitter/mounting block in contact with the medium are oil and grease-free. Only for DN15, DN20 and DN25.
2) Only for analogue/switch and pulse output
3) Other gases upon request
1)
for DN15, DN20, DN25 no code
for DN32, DN40, DN50 N50
Analogue/switch/pulse output A6
RS485 Modbus RTU J3P1
M-Bus J5P4
With display D2
without no code
degreased for oxygen measurement
1)
DN15 (1/2“)
DN20 (3/4“)
DN25 (1“)
DN32 (1-1/4“) only for N50
DN40 (1-1/2“) only for N50
DN50 (2“) only for N50
Analogue output 4-20 mA
0-20 mA
Switch output
Pulse output (Only with Measurand output 2 = Consumption)
Switch output
Standard volume flow V‘n [Nm3/h]
V‘n [Nm
3
/min]
V‘n [l/min]
V‘n [l/s]
V‘n [SCFM]
Mass flow m‘ [kg/h]
m‘ [kg/min]
Standard flow vn [Nm/s]
vn [SFPM]
Temperature T [°C]
T [°F]
Consumption Qn [Nm3] (Only for output 2 = Pulse output)
Standard volume flow V‘n [Nm
V‘n [Nm
3
/h]
3
/min]
V‘n [l/min]
V‘n [l/s]
V‘n [SCFM]
Mass flow m‘ [kg/h]
m‘ [kg/min]
Standard flow vn [Nm/s]
vn [SFPM]
Temperature T [°C]
T [°F]
SI units [mbar, °C]
US units [psi, °F]
Air
Nitrogen
CO
2
Oxygen
Argon
BSP-thread NPT-thread
DN15 (1/2“) HA079015 HA179015
DN20 (3/4“) HA079020 HA179020
DN25 (1“) HA079025 HA179025
DN32 (1-1/4“) HA079032
DN40 (1-1/2“) HA079040 HA179040
DN50 (2“) HA079050 HA179050
DN15 (1/2“) HA078015 HA178015
DN20 (3/4“) HA078020 HA178020
DN25 (1“) HA078025 HA178025
DN15 (1/2“) HA081015 HA181015
DN20 (3/4“) HA081020 HA181020
DN25 (1“) HA081025 HA181025
AF2
DN15
DN20
DN25
DN32
DN40
DN50
no code
GA5
GA9
no code
GB9
no code
MA84
MA85
MA86
MA87
MA80
MA81
MA22
MA23
MA1
MA2
no code
MB83
MB84
MB85
MB86
MB87
MB80
MB81
MB22
MB23
MB1
MB2
no code
U2
no code
FU2
FU3
FU4
FU7
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Order Example
Item 1 - Transmitter
EE741-A6D2DN15
Pipe diameter/type for DN15, DN20, DN25
Output: Analogue/switch/pulse output
Display: With display
Pipe diameter (selectable): DN15 (1/2”)
Unit for process parameters: SI units [mbar, °C]
Medium: Air
Item 2 - Gauge mounting block
HA079015
Aluminum gauge mounting block DN15 (1/2“)
Accessories
- Inlet and outlet path BSP thread, stainless steel, for mounting block DN15 (1/2“) HA070215
DN20 (3/4“) HA070220
DN25 (1“) HA070225
DN32 (1-1/4“) HA070232
DN40 (1-1/2“) HA070240
DN50 (2“) HA070250
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
• Operating instructions
• Two self-adhesive labels for configuration changes
(see user guide at www.epluse.com/relabeling)
• Inspection certificate according to DIN EN10204 - 3.1
Item 2: Gauge mounting block:
• Gauge mounting block incl. sealing plug
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