IN Brief:
- Mouser is now shipping Sensirion’s SFM3505 digital mass-flow meters.
- The sensors cover −150 to +300 slm flow measurement for air and oxygen.
- The devices target mechanical ventilation, anaesthesia, gas mixing, and industrial flow systems.
Sensirion SFM3505 high-performance digital mass-flow meters are now available from Mouser Electronics, adding a compact gas-flow sensing option for medical and industrial applications that require low noise, low pressure drop, and stable digital output.
The SFM3505 series has been designed for inspiratory flow measurement in systems including mechanical ventilators, anaesthesia equipment, and gas-mixing platforms. The devices measure air and oxygen across an extended flow range from −150 to +300 standard litres per minute, with two variants available: the SFM3505-300 standard-accuracy version and the SFM3505-300-X high-accuracy version.
Built on Sensirion’s fifth-generation CMOSens technology, the flow meters integrate the sensing element and signal processing on a single microchip. Calibrated digital output is provided through a standard I²C interface, while on-chip temperature compensation supports measurement stability across varying operating conditions.
Design evaluation is supported through the SEK-SFM3505 evaluation kit cable, which allows either SFM3505 variant to connect through Sensirion’s SensorBridge. The setup can be used with viewer software for measurement display, logging, and data export, and is backed by drivers, sample code, datasheets, CAD drawings, handling notes, flow-conversion resources, and selection guides.
Flow sensing in medical equipment has become a more integrated part of the control system, particularly as ventilation and anaesthesia platforms require stable measurement without adding unnecessary resistance to the gas path. A low pressure drop reduces the load placed on pumps, valves, and control loops, while digital output reduces the amount of analogue signal-conditioning circuitry required around the sensor.
Industrial gas-flow systems are following a similar path. As process equipment becomes more compact and software-controlled, sensors are expected to deliver calibrated data directly into embedded controllers, rather than relying on large external measurement chains. That places more value on devices that combine sensing, compensation, and digital communication in a small mechanical footprint.
Flow measurement has been moving steadily towards application-specific electronics. ScioSense’s ultrasonic flow converter for smart meters shows the same shift in a utility context, with signal processing and embedded interfaces becoming central to measurement performance.
For medical systems, long-term stability and repeatable calibration are central design requirements. Ventilation, anaesthesia, and gas-mixing platforms must operate over extended periods with predictable behaviour across temperature variation, changing flow profiles, and different gas compositions. Integrating the sensing element and signal processing reduces the number of external variables around the measurement path.
The SFM3505 series gives equipment designers a digital flow-sensing option for systems where accuracy, pressure drop, interface simplicity, and mechanical integration all need to be balanced. As medical and industrial platforms become more compact and software-defined, the sensor’s role is moving from passive input to active part of the control architecture.
