25
User Manual EE741 Inline Flow Sensor for Compressed Air and Gases
10 Technical Data
Measurands
Flow
Standard conditions
(factory setting)
1 013.25 mbar
(14.7 psi)
, 0 °C
(32 °F)
(configurable)
Measurement range
1)
in air
DN15 (1/2"): 0.2...76.3 Nm
3
/h
(0.12...44.88 SCFM)
DN20 (3/4"): 0.4...135.7 Nm
3
/h
(0.24...79.77 SCFM)
DN25 (1"):
0.6...212 Nm
3
/h
(0.36...124.71 SCFM)
DN32 (1-1/4"): 0.9...347.4 Nm
3
/h
(0.52...202.06 SCFM)
DN40 (1-1/2"): 1.4...542.8 Nm
3
/h
(0.81...315.71 SCFM)
DN50 (2"):
2.2...848.2 Nm
3
/h
(1.22...493.35 SCFM)
Accuracy
2)
in air at 7 bar (102 psi) (abs) and 23 °C (73 °F)
± (3 % of measured value + 0.3 % of full scale)
Pressure dependency
Compensated by entering the system pressure
using the EE-PCS
3)
Response time t
90
< 2 s
Measurement interval
0.1 s
Temperature
Measurement 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
R
L
< 500 Ω
Switch output
DC PNP, max. 100 mA, V
drop
< 2.5 V, 10 kΩ pull-down
Configurable: N/C or N/O, hysteresis, window
Pulse output
Consumption meter, pulse length 0.02...2 s
Digital interface
RS485
Protocol Modbus RTU (EE741 = 1 unit load)
Default settings
Baud rate 9 600
4)
, parity even, 1 stop bit, slave ID 240
M-BUS
Default settings
Baud rate 2 400
5)
, parity even, 1 stop bit, slave ID 240
IO-Link
Interface specification
IO-Link v1.1, IO-Link device, COM2 (38.4 kBaud)
Service interface
USB
General
Supply voltage
18 - 30 V DC
Current consumption
with display
I
max
≤ 120 mA
(P
max
≤ 2,5 W)
without display
I
max
≤ 60 mA
(P
max
≤ 1.6 W)
Operating pressure (max.)
16 bar
(232 psi)
/ PN16
Ambient temperature range
with display
0...50 °C
(32...122 °F)
without display
-20...60 °C
(-4...140 °F)
Medium and storage temperature range
-20...60 °C
(-4...140 °F)
Humidity working range
0…100 % RH, non-condensing
Medium
Compressed air or none corrosive gases
Electrical connection
M12x1 plug, 4 poles
Electromagnetic compatibility
EN 61326-1 EN 61326-2-3
Industrial environment
Material
Enclosure sensing unit
Polycarbonate
Sensing head / sensor element
Stainless steel 1.4404 / glass
Gauge mounting block
Aluminium anodised or stainless steel 1.4404
Gauge mounting block with flanges
Entire media contacting surface in stainless steel 1.4404
Enclosure protection rating
IP65
1) See user manual for factory settings.
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 accord-
ance with EA-4/02 following the GUM (Guide to the Expression of Uncertainty in Measurement). Temperature coefficient: ± 0.25 % of measured value / °C deviating from
23 °C (73 °F).
3) The flow sensor is factory adjusted at 7 bar (abs, 102 psi). Pressure compensation is valid for v = 10 ... 120 Nm / s. Without entering the system pressure into the EE741,
the pressure dependency is +/- 0.5 % of the measured value / bar deviating from 7 bar.
4) Supported baud rates: 600, 1200, 2400, 4800, 9 600, 19 200, 38 400 and 57 600; find more details about communication setting in the User Manual and the
Modbus Application Note at
5) Supported baud rates: 600, 1200, 2400, 4800 and 9 600; find more details about communication setting in the User Manual
