Aranet4 HOME Carbon Dioxide Sensor

Aranet4 HOME Sensor

We produce carbon dioxide (CO2) when we breathe, which makes it a particularly important factor in classrooms, where many people are present in a limited space.

As early as the 19th century, the hygienist Prof. Max von Pettenkofer investigated the effects of increasing CO2 levels in assembly rooms. These investigations resulted in the eponymous Pettenkofer number, which sets a maximum acceptable value of 1,000 ppm for indoor spaces. Outdoor concentrations vary between approximately 400 ppm (parts per million) in clean air areas and 500 ppm in urban areas.
Various studies, conducted specifically in classrooms, have shown that after the first lesson of the morning (with year 5 pupils), CO2 concentrations reached 1,900 to 3,300 ppm.

The seasons also play a part, with CO2 limits exceeded more quickly in winter than in summer.

The effects of excessive CO2 concentrations on everyday school life are reduced concentration and performance, increased fatigue and errors and general discomfort, both for teaching staff and pupils.
Recent studies have shown that CO2 concentration is a very good indicator for the presence of aerosols in the room. This means that increasing the air exchange rate can reduce the aerosol concentration and therefore the risk of infection.

In order to create a learner-friendly and healthy climate in the classrooms for everyone, effective ventilation is essential. This is why the CO2 warning light with high-quality NDIR 2-beam sensor has been developed. It monitors the current CO2 concentration in the classroom and clearly signals with coloured lights when ventilation may be needed.