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Compressed air flow and consumption monitoring

S401 – Thermal mass flow meter with insertion technology

Insertion thermal mass flow sensor, ideal for monitoring compressed air and process gases.


  • Insertion-type flow sensor, ideal for flexible installations and direct measurement under pressure.
  • Thermal mass flow measurement, independent of system pressure and temperature.
  • High accuracy and wide measuring range, suitable for detecting everything from large flow rates to small air or gas leaks.
  • Internal memory with two calibration curves, allowing the same sensor to be used with two different gases while maintaining maximum accuracy.
  • Integrated digital display for real-time visualization of instantaneous flow and totalized consumption.
  • Compatible with pipe diameters from 1” to 12” (other diameters available upon request).
  • Can be installed without shutting down the pressurized line (see installation video).
  • Robust housing with IP65 protection, designed for demanding industrial environments.
  • Isolated analog and pulse outputs, plus MODBUS / RTU interface for integration with monitoring systems.
  • Ultra-fast response time, ensuring stable readings even under fluctuating flow conditions.

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S415 / S418 – Thermal Mass Flow Sensor

Precise measurement of flow and consumption of compressed air and industrial gases


  • Flexible signal outputs: analog 4–20 mA or Modbus RTU digital communication, enabling easy integration into control and monitoring systems.
  • High measurement accuracy: accuracy of up to ±1% of reading, ideal for applications requiring reliable consumption control.
  • Real-gas calibration: capability to calibrate for up to two different gases, ensuring greater accuracy in specific applications.
  • Direct measurement at the point of use: reliable and cost-effective monitoring of compressed air and nitrogen consumption, without the need for straight pipe runs or additional calculations.

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S418-V – Thermal Mass Flow Sensor for Vacuum Applications

In-line sensor for precise measurement of flow, consumption, and absolute pressure in industrial vacuum systems.


  • Thermal mass flow sensor specifically designed for vacuum applications.
  • Direct measurement of true volumetric flow rate in vacuum, without bypass methods.
  • No additional pressure or temperature compensation required, even under variable conditions.
  • Integrated absolute pressure sensor for precise vacuum system monitoring.
  • Internal data logger with large storage capacity for historical analysis.
  • Integrated flow conditioner eliminates the need for straight inlet or outlet pipe runs.
  • Wireless interface for configuration and adjustment via mobile app.
  • Available signal outputs: 4…20 mA, pulse, and Modbus RTU.
  • High measurement accuracy suitable for industrial vacuum applications.
  • Gas-type threaded connection (ISO 228-1) available in DN8, DN15, DN20, and DN25.

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S421 – In-line Thermal Mass Flow Meter

Thermal Mass Flow Sensor with Pipe Section


  • Individual factory calibration on the complete measuring section, ensuring high accuracy and excellent repeatability even under variable flow conditions.
  • Dual calibration curve stored in internal memory, ideal for operation with two different gases or different operating ranges without the need for recalibration.
  • Integrated pipe design that ensures stable and reliable measurement by eliminating errors caused by irregular flow profiles.
  • Fast response to flow changes, suitable for dynamic processes and continuous monitoring.
  • Robust industrial construction, designed for continuous operation in demanding industrial environments.
  • Direct mass flow measurement, reducing sources of error and simplifying commissioning.

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S430 – Flow and Consumption Sensor for Compressed Air

Precise measurement of flow and consumption in untreated compressed air


  • Precise measurement of flow and consumption in demanding applications with humid air, steam, and high-velocity flows.
  • Designed for installation at the compressor discharge, even with undried or unfiltered air.
  • Direct measurement of the compressor’s FAD flow, without estimates or correction factors.
  • Pitot-type measurement technology, ideal for high-pressure and high-temperature conditions.
  • High measurement stability, even under rapid flow variations.
  • Suitable for large-diameter pipes, typical in main compressed air systems.
  • Low maintenance, with no moving parts exposed to the flow.
  • Robust and reliable solution for energy audits and compressor performance monitoring.

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S450/S452 – Explosion‑Proof Flow Sensor (Insertion / In‑Line)

Flow sensor designed for harsh industrial environments and ATEX applications


  • Direct measurement of mass flow and standard flow without the need for pressure compensation.
  • Wireless interface for on-site configuration and monitoring of the sensor.
  • Robust and durable design for harsh environments, including outdoor use (IP67).
  • No moving parts, ensuring low maintenance and zero clogging.
  • Compatible with explosive environments (ATEX/IECEx option).
  • Supports a wide range of pipe sizes: insertion type for large diameters and in-line type for small diameters.
  • Configurable outputs: 4–20 mA, pulse, HART, or Modbus, for flexible integration with industrial systems.

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S461 – High‑Precision Ultrasonic Flow Meter for Liquids

Clamp‑on device for high‑precision liquid flow and consumption measurement.


  • Non-contact measurement of flow and consumption for multiple liquids.
  • Energy measurement with clamp-on temperature probes (optional).
  • Bidirectional flow with separate counters.
  • Easy installation and configuration via the S4C-US app.
  • Compatible with pipes from DN40 to DN1200.
  • Data logging and energy efficiency analysis.
  • Outputs: Modbus, 4–20 mA, pulses, and alarms as required.
  • Portable version available for temporary measurements.

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S462 – External Ultrasonic Flow Meter for Liquids (Clamp-On)

External installation — fast and non-intrusive, with no need to cut into the pipe


  • Non-intrusive ultrasonic measurement using Clamp-On technology, with no direct contact with the fluid.
  • Compatible with clean liquids such as water, seawater, and other fluids upon request.
  • Fast external installation, with no pipe cutting and no process interruption.
  • Integrated OLED display for real-time value visualization and parameter configuration.
  • Compact and robust design, suitable for industrial environments.
  • High measurement accuracy and stability in continuous flow applications.
  • Ideal for consumption monitoring and industrial process control.

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