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Sensirion have launched the SCD4x series of next generation miniature CO₂ sensors that offer an unmatched price-to-performance ratio along with an evaluation kit SEK-SCD41 which helps developers accelerate their designs. This sensor builds on the photoacoustic sensing principle and Sensirion’s patented PASens® and CMOSens® Technology to enable unmatched small sensor size combined with high performance.

As people across the world return to public area’s such as the work place and schools despite the coronavirus pandemic, this can present some issues as many of these environments are often enclosed or potentially poorly ventilated spaces where occupants can be sitting side by side for several hours. Of course, this raises concerns about virus transmission. Tiny droplets (known as aerosols) are emitted not only when people cough or sneeze, but also during normal breathing and speech. These aerosols may contain viruses, which is why frequent and effective ventilation of enclosed spaces is more important than ever. The more fresh air there is in a closed room, the less exhaled air which may contain viruses.

Various solutions for regular ventilation in enclosed spaces exist and by far one of the most effective indicators that a space needs ventilating is to measure the CO₂ level, here is where modules equipped with Sensirion CO₂ sensors can be used to effectively measure air quality in enclosed spaces. The advantage: a CO₂ warning system is easy to use, intuitively understandable thanks to the traffic light system, and measures with high accuracy. A CO₂ warning system ensures regular and effective ventilation, so occupants have the confidence to return to these spaces. In addition to reducing the risk of transmitting viruses such as COVID-19, CO₂ reduction measures also increase concentration capacity – another positive effect.

CO₂ sensing for better indoor air quality

The SCD4x miniature CO₂ sensors are compatible with SMD soldering processes and feature a small footprint allowing cost and space-effective integration to boost freedom of design for customers. The CO₂ sensor also integrates a best-in class humidity and temperature sensor which enables superior on-chip signal compensation and addition RH and Temperature outputs. The sensor has a large supply voltage (2.4 V – 5.5 V) capability, coupled with robustness towards external stresses and adjustable power consumption make the SCD4x the perfect fit for varying customer needs.

Functional Block Diagram

The SCD4x CO₂ sensors use Sensirion’s PASens® Technology which is based on the photoacoustic sensing principle. The photoacoustic sensing principle allows extreme miniaturization of the CO₂ sensor without compromising sensor performance due to the fact that the sensor sensitivity is independent of the optical cavity size. The reduced size and the smaller number of integrated components result in a highly price-efficient BOM structure. Thanks to the miniaturizing and the economical BOM structure of these new CO₂ sensor, the SCD4x will open up numerous possibilities for a whole new set of products and applications.

PASens® Technology

The SCD4x come in two model variants, the SCD40 with a specified accuracy of ± (50 ppm + 5% of reading) for CO₂ levels 400 – 2’000 ppm and the SCD41 with a specified accuracy of ± (40 ppm + 5% of reading) for CO₂ levels 400 ppm – 5’000 ppm. The humidity sensing range is 0 %RH – 100 %RH with typical accuracy of 6% over 15 °C – 35 °C, 20 %RH – 65 %RH and 9% over -10 °C – 60 °C, 0 %RH – 100 %RH. Temperature measurement range is - 10°C – 60°C with a typical accuracy of 0.8°C over 15 °C – 35 °C and 1.5°C over -10 °C – 60 °C.

The SCD4x CO₂ sensors are supported by the SEK-SCD41 evaluation kit which has been designed for easy and cost-efficient evaluation of the sensors. The kit contains a SCD41 mounted on a development board with a JST connector and through-hole pins. The included adapter cable (JST-Ethernet) connects to the SEK-SensorBridge for easy evaluation of the sensor via the SEK-ControlCenter viewer software. The kit also contains a 4-pin jumper wire cable that enables fast prototyping, e.g. through integration into existing evaluation platforms (like Arduino, Raspberry Pi, etc.).

SEK-SCD41 evaluation kit introduction

The sensors are supplied on tape and reel packaging combined with its SMD assembly processing making the SCD4x ideal for high-volume applications.

Anglia are offering customers a FREE evaluation kit and samples of the SCD4x series of next generation miniature CO₂ sensors from Sensirion, please fill in the form below to register for evaluation kit and samples now.