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Flow meter with integrated backflow prevention and display


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  • Precise detection of flow and medium temperature
  • Suitable for water, coolants, oil and glycol solutions thanks to integrated measurement graphs
  • Reliable backflow prevention with very fast response time
  • With switching output, analogue output or frequency output and IO-Link
  • Clearly visible LED display with red/green colour change
  • ce
  • eac
  • cul
  • iolink
  • crn
Technische Details
Product characteristics
Number of inputs and outputs Number of digital outputs: 2; Number of analogue outputs: 1
Process connection threaded connection Rp 1 1/2 internal thread
Temperature monitoring
Measuring range [°C] -10...100
Special feature Gold-plated contacts
Application for industrial applications
Media water; glycol solutions; coolants; oil
Note on media
oil 1 with viscosity: 10 mm²/s (40 °C)
oil 2 with viscosity: 46 mm²/s (40 °C)
Medium temperature [°C] -10...100
Pressure rating [bar] 25
MAWP (for applications according to CRN) [bar] 25
Electrical data
Operating voltage [V] 18...30 DC; (according to EN 50178 SELV/PELV)
Current consumption [mA] < 50
Protection class III
Reverse polarity protection yes
Power-on delay time [s] < 3
Inputs / outputs
Number of inputs and outputs Number of digital outputs: 2; Number of analogue outputs: 1
Total number of outputs 2
Output signal switching signal; analogue signal; frequency signal; IO-Link; (configurable)
Number of digital outputs 2
Output function normally open / normally closed; (parameterisable)
Max. voltage drop switching output DC [V] 2
Permanent current rating of switching output DC [mA] 150; (per output 2 x 200 (...60 °C); 2 x 250 (...40 °C))
Switching cycles (mechanical) 10 million
Number of analogue outputs 1
Analogue current output [mA] 4...20
Max. load [Ω] 500
Short-circuit protection yes
Overload protection yes
Frequency of the output [Hz] 0...10000
Measuring/setting range
Measuring range
4...200 l/min 0.24...12 m³/h
Display range
0...240 l/min 0...14.4 m³/h
1 l/min 0.05 m³/h
Set point SP
2...200 l/min 0.1...12 m³/h
Reset point rP
0...198 l/min 0...11.9 m³/h
Frequency end point, FEP
13...200 l/min 0.8...12 m³/h
In steps of
1 l/min 0.05 m³/h
Frequency at the end point FRP [Hz] 10...10000
Measuring dynamics 1:50
In steps of 10 Hz
Temperature monitoring
In steps of 10Hz
Measuring range [°C] -10...100
Display range [°C] -32...122
Resolution [°C] 1
Set point SP [°C] -9...100
Reset point rP [°C] -10...99
In steps of [°C] 1
Frequency start point, FSP [°C] -10...78
Frequency end point, FEP [°C] 12...100
Frequency at the end point FRP [Hz] 10...10000
Accuracy / deviations
Flow monitoring
Accuracy (in the measuring range) ± (4 % MW + 1 % MEW); (Q > 1 l/min; medium and operating temperature: +22 °C ± 4K)
Repeatability ± 1 % MEW
Temperature monitoring
Temperature drift 0,029 °C / K
Accuracy [K] 3 K (25°C; Q > 1 l/min)
Response times
Flow monitoring
Response time [s] 0.01
Damping for the switching output dAP [s] 0...5
Damping for the analogue output dAA [s] 0...5
Temperature monitoring
Dynamic response T05 / T09 [s] T09 = 120 (Q > 1 l/min)
Software / programming
Parameter setting options hysteresis / window; normally open / normally closed; switching logic; current/frequency output; medium selection; damping for the switching output / analogue output; display can be rotated and switched off; standard unit of measurement; process value colour
Communication interface IO-Link
Transmission type COM2 (38,4 kBaud)
IO-Link revision 1.1
SDCI standard IEC 61131-9 CDV
IO-Link device ID 564 d / 0234 h
Profiles Smart Sensor: Process Data Variable; Device Identification
SIO mode yes
Required master port type A
Process data analogue 2
Process data binary 2
Min. process cycle time [ms] 5
Operating conditions
Ambient temperature [°C] 0...60
Note on ambient temperature
medium temperature < 80 °C
medium temperature < 100 °C: 0...40 °C
Storage temperature [°C] -15...80
Protection IP 65; IP 67
Tests / approvals
DIN EN 61000-6-2
DIN EN 61000-6-3
Shock resistance
DIN EN 60068-2-27 20 g (11 ms)
Vibration resistance
DIN EN 60068-2-6 5 g (10...2000 Hz)
MTTF [years] 145
UL approval
UL Approval no. I007
Pressure Equipment Directive Sound engineering practice; can be used for group 2 fluids; group 1 fluids on request
Mechanical data
Weight [g] 1808
Materials stainless steel (1.4404 / 316L); PBT+PC-GF30; PBT-GF20; PC; brass chemically nickel-plated
Materials (wetted parts) stainless steel (1.4401 / 316); stainless steel (1.4404 / 316L); brass (2.0371); brass chemically nickel-plated; PPS; PP-GF30; O-ring: FKM
Process connection threaded connection Rp 1 1/2 internal thread
Displays / operating elements
Display unit 3 x LED, green
switching status 2 x LED, yellow
measured values alphanumeric display, red/green 4-digit
programming alphanumeric display, 4-digit
Recommendation: use a 200-micron filter.
All data refer to water (20 °C).
MW = measured value
MEW = Final value of the measuring range
Pack quantity 1 pcs.
Electrical connection
Connection Connector: 1 x M12; Contacts: gold-plated
Diagrams and graphs
Pressure loss
dP Pressure loss
Q volumetric flow quantity
ifm electronic gmbh • Friedrichstraße 1 • 45128 Essen — We reserve the right to make technical alterations without prior notice. — EN-GB — SBY257-02 — 19.08.2015 —