Sensirion Introduces Next-Generation Compact Flow Sensors

Sensirion is debuting the SFM3505-300 and SFM3505-300-X—high-performance and compact flow sensors that are part of the company’s next-generation compact digital flow family. The pair succeeds the SFM3119 and SFM3100 sensors.

Featuring a completely re-engineered architecture, the new sensor delivers best-in-class performance with ultra-low noise and high accuracy across an extended flow range from –150 to +300 slm. The sensor is offered in two performance tiers, SFM3505-300 with standard (2.3% m.v.) and SFM3505-300-X with high (1.5% m.v.) accuracy.

Built on Sensirion’s latest 5th-generation CMOSens Technology, the SFM3505 integrates the sensor element and advanced signal processing on a single microchip. This enables fast, stable, and fully calibrated digital output via a standard I²C interface, ensuring long-term reliability and robust operation over the sensor’s lifetime. 

The sensor is calibrated for air and oxygen and incorporates on-chip temperature compensation, ensuring precise measurements under varying conditions. Its optimized flow channel design enables minimal pressure drop across the full dynamic range, making it ideal for inspiratory flow measurements in applications such as mechanical ventilation, anesthesia, and gas mixing systems, according to the company. 

“With the SFM3505, Sensirion meets all customer requirements, including low pressure drop, low noise levels, and high accuracy at high flow rates, while also ensuring accurate operation at low flow rates—all in a compact form factor,” said Pauline Simonet, Sensirion’s product manager for flow sensors. 

Sensirion develops and manufactures sensors and sensor solutions that improve efficiency, health, safety, and comfort. Founded in 1998, the company employs around 1,200 people at its headquarters in Stäfa, Switzerland, and in numerous international subsidiaries. Its product range includes environmental sensors for the precise and reliable measurement of humidity and temperature, volatile organic compounds (VOC), nitrogen oxides (NOx), carbon dioxide (CO₂), formaldehyde and particulate matter (PM2.5), as well as gas and liquid flow sensors, differential pressure sensors, and gas leakage sensors. These solutions are used across a wide range of applications. Sensirion develops solutions for customers’ needs from the automotive, industrial, medical, HVAC, and consumer electronics markets, as well as products for cost-efficient mass production.