Senseair launches next-generation CO₂ sensor featuring 75% smaller size and SMD-solderability for demand-controlled HVAC systems

Senseair, Swedish subsidiary of Asahi Kasei Microdevices, has developed the “S12 CO₂” as a next-generation CO₂ sensor for demand-controlled ventilation (DCV) in zero-energy buildings and battery-powered indoor air quality (IAQ) monitoring. The new model is approximately 75% smaller in volume than its predecessors and can be used as a surface-mount device (SMD) on circuit boards while maintaining high accuracy and low power consumption. This enables sensor integration in applications where installation was previously difficult. Senseair has already begun sample distribution and plans to initiate mass production in 2026.

In recent years, legal frameworks to enhance the energy efficiency of buildings have become stricter worldwide. Particularly within the EU, the Energy Performance of Buildings Directive adopted in 2024 requires new buildings to comply with the zero-emission standard. These buildings have very low energy needs, which are largely covered by onsite and nearby renewable energy sources. This legislation will come into effect for new public buildings by 2028 and for all other new buildings by 2030.

To contribute to achieving this zero-emission level for buildings, intelligent DCV systems are emerging as a highly effective alternative to conventional temperature-controlled ventilation. DCV systems automatically adjust the ventilation based on CO₂ levels, thus enabling both reduction in energy consumption and comfortable IAQ. However, DCV systems require the installation of CO₂ sensors across the entire building, and constraints in design and installation space have so far proved to be major challenges.

Senseair’s new “S12 CO₂” sensor features a redesigned structure based on the company’s NDIR (non-dispersive infrared absorption) sensor technology. With a measurement range of 400 – 10,000 ppm and an accuracy of +/- (30 ppm + 3% of reading), the new sensor maintains the performance of its predecessor CO₂ sensors, “Sunrise” and “Sunlight,” but comes with a significantly smaller packaging size of 18 mm × 15 mm × 7 mm. This compact size enables the effective use of available space. It enables SMD reflow surface mounting on circuit boards, offering a discreet and elegant installation in air conditioning equipment or wall-mounted monitors without compromising design aesthetics.