CO2 traffic lights rely on Sensirion’s sensor technology for classroom air quality measurement

15 October 2020

Sensirion_ISIS-IC_CO2 signal lights for classrooms_580x280
Sensirion_ISIS-IC_CO2 signal lights for classrooms_580x280

IoT system integrator, ISIS IC GmbH has chosen environmental sensors expert, Sensirion’s SCD30 CO2 sensor for its CO2 signal lights for classrooms, thus enabling reliable & accurate air quality measurements in schools – helping combat COVID-19. The SCD30 is an ideal solution for determining air quality and for applications in the heating, ventilation & air conditioning (HVAC) sector.

Scientists have proven that SARS-CoV-2, COVID-19 and other viruses are mainly spread by aerosols exhaled by infected people. In enclosed indoor spaces (classrooms, offices, gyms, theatres and so on), the main source of aerosols and CO2 is the human body itself. High CO2 concentrations in rooms are therefore accompanied by high aerosol levels, which in turn indicate inadequate ventilation and also increase the risk of infection. Measuring CO2 is therefore a useful method for assessing air quality with respect to CO2 and aerosol concentration, and enables simple, clear and feasible ventilation recommendations to be made. In the cold season in particular, it is possible to achieve a balance between preventing the building becoming too cold through ventilation, and reducing the risk of viral infection.

As an expert in environmental sensor technology, Sensirion is the ideal partner for our CO2 traffic lights. Thanks to its high accuracy, compact size and excellent performance, Sensirion’s SCD30 CO2 sensor met all our requirements,” says Dirk Unsenos of ISIS IC GmbH. “In the meantime, we have already been able to gain important insights during our pilot projects in schools, which are significant with regard to safety and acceptance in daily classroom use.

While larger respiratory droplets sink quickly to the ground, aerosols can float in the air for a long time. It is therefore especially important to monitor and optimise air quality in classrooms. We are convinced that the CO2 signal light with its reliable measurement and instructive traffic light colours can help to monitor air quality and thus minimise the risk of infection and improve students’ concentration,” says Pascal Gerner, Director Product Management at Sensirion.

Sensirion’s SCD30 sensors, based on CMOSens® Technology, enable high-accuracy carbon dioxide measurements at an attractive price-performance ratio. In addition to the CO2 sensor, a first-class humidity and temperature sensor is used on the same sensor module.

Sensirion_ISIS-IC_CO2 signal lights for classrooms_green_580x280
Sensirion_ISIS-IC_CO2 signal lights for classrooms_green_580x280

More about the CO2 sensor:

More about the CO2 signal light:


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Sensirion_ISIS-IC_CO2 signal lights for classrooms_red_580x280

German company, ISIS IC offers its expertise in the field of sensor technology combined with Internet of Things (IoT). ISIS IC offers both full service in the development of IoT products, as well as its own products, such as the HELIA series of assistance systems and CO2AMPEL, for example. The development portfolio ranges from the special sensor, over a radio link with hardware and embedded software, to operation and visualisation through an Internet portal and to the smartphone. And for actuator purposes, it works of course from the smartphone to the actuator (actuators are usually drive units that convert an electrical signal into mechanical movements or changes in physical parameters, such as pressure or temperature, and thus actively intervene in the controlled process). The company is also involved in various international research projects. Topics include medical technology solutions for digital health care or civil drone technology.

About Sensirion: Experts for Environmental & Flow Sensor Solutions

Headquartered in Stäfa, Switzerland, Sensirion AG is a leading manufacturer of digital microsensors and systems. Its product range includes gas and liquid flow sensors, differential pressure sensors and environmental sensors for the measurement of humidity and temperature, volatile organic compounds (VOC), carbon dioxide (CO2) and particulate matter (Pm2.5). An international network with sales offices in the USA, Europe, China, Taiwan, Japan and Korea supplies international customers with standard and custom sensor system solutions for a wide range of applications. Sensirion sensors are commonly used in the medical, industrial and automotive sectors, and in analytical instruments, consumer goods and HVAC products.

One of the hallmark features of Sensirion products is the use of its patented CMOSens® Technology, which allows for intelligent system integration of the sensor element, logic, calibration data and digital interface on a single chip. Sensirion's credentials as a reliable supplier are evident from its loyal customer base, reputation for quality (ISO/TS 16949) and excellent customer pedigree.

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