S 415/418 Thermal Mass Flow Meter


  • Thermal mass flow, no additonal compensation required
  • Economic and affordable version S 415
  • High end version S 418
  • wireless communication interface for sensor settings
  • Accuracy up to 1%
  • Variouse sensor outputs: 4... 20 mA, Modbus RTU
  • No straight inlet requirements thanks to the integrated flow conditioner
  • No by-pass measurement, measures the whole mass flow
  • G inner thread connection DN8, DN15, DN20 or DN25 (ISO 228-1)
  • S 418 with integrated data logger and pressure measurement
  • Real gas calibration in 2 different gases possible

The SUTO S 415 and S 418 thermal mass flowmeters offer gas flow and consumption measurement directly at the point of use. These highly economical units will help you improve system efficiency, while helping reduce compressed air usage and operating costs. Both versions come standard with wireless communication interface to help the user quickly and easily check the flow meter readings or adjust the settings via the SUTO flow meter app.

The S 415 is best suited to general process work where low cost and broad monitoring is required, while the S 418 is ideal for remote locations or high accuracy with its built in data logger and optional pressure sensing.

Technical data S 415 S 418
Measuring ranges See separate table
Accuracy 3% of reading 1.5% of reading
Pressure range 0 … 1.0 MPa
Power supply 18 … 30 VDC / 120 mA
Measured gas Air, N Non-corrosive gases,
up to 2
calibrated gases
Ambient conditions 0 … 50 °C
Transport Temp. -30 … +70 °C
Response time T90 = 1 sec T90 = 0.1 sec
Output signal
(only 1 of it)
– 4 … 20 mA and pulse, isolated
– RS-485 (Modbus/RTU)
Interface Bluetooth for service app or IIoT
USB for logger read out (S 418 only)
Casing Process connection: aluminum alloy
Wetted parts: aluminum alloy
Top casing: PC + ABS
Classification IP54
Electrical connection 2 x M8, 4 poles
Process connection G inner thread: DN8, DN15, DN20, DN25
Approvals CE, RoHS