S418 Compact Flow Sensor for Compressed Air and Gases (Pro-Inline)

Compact flow meter provides accurate consumption and cost monitoring of gas supplies and consumers.

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Efficient monitoring for compressed air and gases

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Economic flow and consumption metering at low investments

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No straight inlet section needed, due to flow conditioner

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Installation and configuration through smartphone app

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Integrated data logger for measurement recordings

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Accuracy of 1.5% o.RDG, measuring volume 100: 1

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Isolated 4... 20 mA & Pulse; Modbus/ RTU; M-Bus

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G inner thread connection: DN8, DN15, DN20, DN25 or DN32

The S418 Compact Flow Sensor provides compressed air flow and gas monitoring directly where it is needed. The seamless integration into a compressed air and gas system makes it an affordable and easy to install flow measurement solution.

Get Your Compressed Air and Gas Cost Under Control

The S418 helps you to improve your compressed air system efficiency and get your operating costs under control. By monitoring flow, consumption, pressure and temperature in one device optimization potential can be easily detected.

The integrated data logger helps to collect and save your data, which can be imported into data analysis software via Modbus outputs.

Wireless Communication and Configuration

The S418 Flow Sensor comes standard with wireless communication interface to quickly and easily check the flow sensor readings. This can also be used to adjust the settings via the SUTO flow sensor app S4C-FS. Flow sensor configurations and online real-time data readings have never been easier.

Integrated Flow Conditioner

To ensure accurate readings regardless of the design of the piping system, the S418 has a built-in flow conditioner. Due to the flow conditioner design, no straight pipe inlet sections are needed to provide reliable compressed air and gas flow monitoring.

Thermal Mass Flow Technology

With the use of thermal mass flow technology, the S418 is virtually independent of pressure and temperature changes. This makes it resistant to environmental influences and at the same time highly precise and reliable.

The S418 Flow Sensor is providing a state-of-the-art and easy to install solution for monitoring your gas and compressed air flow system and usage. Should you have any special requests, such as custom flow ranges or different gas types, please contact us here.

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  • Compressed air and gas consumption and flow measurement at point of use
  • Accurate consumption and cost monitoring of gas supplies and consumers


Accuracy1.5 % o.RDG ±0.3 % FS
Selectable unitsl/min, cfm, kg/h, m3/h
Measuring rangesee table on the previous page
Repeatability0.5 % o.RDG
SensorThermal mass flow sensor
Sampling rate10/sec
Turndown ratio100:1
Response time (t90)0.5 sec
Selectable unitsm³, ft³, l, kg
Accuracy0.5 % FS
Selectable unitsbar, psi
Measuring range0 ... 10 bar(g)
SensorPiezo resistive sensor
Reference conditions
Selectable conditions20 °C 1000 mbar (ISO1217),
0 °C 1013 mbar (DIN1343)
freely adjustable


Analog output
Signal4 ... 20 mA (4-wire), isolated
Scaling0 ... max flow
LoadMax 250 Ω freely adjustable
Update rate3/sec
Pulse output
SignalSwitch output, normally open, max 30 VDC, 200 mA
Scaling1 pulse per consumption unit
Voltage supply15 ... 30 VDC
Current consumption120 mA @ 24 VDC
Data interface
ConnectionUSB micro


WirelessS4C-FS App for mobile phones
PC SoftwareS4A PC software for download and data analyzes
Integrated4 digit LED
Data Logger
Storage8 Mio. values
Process connectionAluminum alloy
HousingPC + ABS
SensorCeramic, glass coated
Metal partsAluminum alloy
Electrical connection2 x M8 (4 pole)
Protection classIP54
ApprovalsCE, RoHS, FCC
Process connectionG-thread
Weight0.45 ... 1.3 kg (depends on model)
Operating conditions
MediumAir, N2, O2, CO2 and other gases
Medium qualityISO 8573: 4.4.3 or better
Medium temperature0 ... 50 °C
Medium humidity< 90 % rH, no condensation
Operating pressure0 ... 10 bar(g)
Ambient temperature0 ... 50 °C
Ambient humidity< 95 % rH
Storage temperature-30 ... 70 °C
Transport temperature-30 ... 70 °C
Pipe sizesDN8, DN15, DN20, DN25, DN32


Standard range (S)2501000200035006000
Low range (L)502004007001200
Stated measuring ranges for S418 under following conditions:
Standard flow in air in l/min
Reference pressure: 1000 mbar
Reference Temperature: +20 °C
Measuring ranges in Nitrogen are different. Please contact us for details at [email protected]


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Info sheets
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S401/ S402/ S415/ S418/ S418-V/ S421/ S430/ S450/ S452/ S460 /S461 /S462 – CE & UKCA DECLARATION OF CONFORMITY

S401/ S402/ S415/ S418/ S418-V/ S421/ S430/ S450/ S452/ S460 /S461 /S462 – CE & UKCA DECLARATION OF CONFORMITY
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S4C-FS App Android: V2.0.1

S4C-FS App Android: V2.0.1
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