Sensirion expands flow sensor range for medical ventilators

August 10, 2021 // By Nick Flaherty
Sensirion expands flow sensor range for medical ventilators
Sensirion has launched three next generation flow sensors that benefit from the lessons learned on ventilator design during the Covid-19 pandemic

Sensirion in Switzerland has launched three new flow sensors for ventilator designs and other respiratory applications.

The next-generation sensors in the SFM3xxx range are suitable for inspiratory applications at ambient pressure and use the CMOSens Technology that integrates the sensor element, logic, calibration data and digital interface on a single chip. These benefit from the experience of using ventilators durig the Covid-19 pandemic. 

The SFM3003 has an extended flow range between -150 and 300 slm, while the SFM3013 is resistant to overpressure (up to 1 bar) and calibrated for heliox. Lastly, the SFM3119 adds a digital sensor to the SFM31xx series of compact sensors.

The SFM3003 is based on the technology used in the SFM3019 sensor, which was brought onto the market during the COVID-19 pandemic to provide a high volume of flow sensors for inspiratory flow measurements in medical ventilators.

Compared to the SFM3019, the SFM3003 comes with a wider flow range and improved specifications. The flow of air, oxygen and mixtures thereof at rates between -30 and 300 slm can be measured with excellent accuracy, reliability and long-term stability with no recalibration required. The SFM3003 also has a very low pressure drop, ultra-fast response time and optimal signal-to-noise ratio. The SFM3013 is a variant of the SFM3003. It offers additional resistance against overpressure (up to 1 bar gauge pressure), and is also calibrated for heliox gas. Both sensors are suitable for high volume, cost sensitive applications.

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The SFM3119 (above) is a compact digital flow meter that is the successor to the SFM3100 flow sensor. The SFM3119 adds a digital I2C output with an accurate for measuring flows of air, oxygen and mixtures between -10 and 240 slm. It has a compact design and can be easily integrated into existing devices with a low pressure drop and is particularly suitable for inspiratory flow sensing in applications such as ventilation and anesthesia, and for mixing oxygen and air to a very precise degree.

The devices are fully calibrated and temperature-compensated sensors that can accurately measure flow rates in both directions.

“The three new flow sensors are the ideal complement to our product range. Our customers can now find the right sensor for all respiratory applications,” said Pauline Simonet, the product manager for the sensors. “In addition to these sensors, we also provide our customers with comprehensive support and all important documents (data sheets, application notes, engineering guide, CAD files, etc.) so that starting new projects can be easy and straightforward.”

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The SFM3119 flow sensor from Sensirion adds an I2C interface

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