A CO₂ sensor measures the carbon dioxide content of the indoor air in ppm (parts per million). If the value rises, the air is stale – a good reason to ventilate automatically.
Guide values
- Outdoor air: around 400 ppm
- up to 1,000 ppm: good indoor air (the so-called Pettenkofer value)
- 1,000 to 2,000 ppm: ventilation recommended
- above 2,000 ppm: inadequate air quality
CO₂ sensor and window actuator
Combined with a suitable ventilation control, the window opens when the air is poor and closes again once the value has dropped. Whether a control has a sensor input is stated in the data sheet. Wind and rain sensors ensure that it still closes in bad weather.
Frequently asked questions
Where does CO₂-controlled ventilation make sense?
In rooms with many people: classrooms, meeting rooms, offices, nurseries.
Do I need a building management system for this?
Not necessarily. There are ventilation controls with sensor inputs. For larger buildings, integration into the building management system is an option – with the i-series actuators, for example, via Modbus.
Read more
- Glossary: Ventilation control
- Glossary: Rain sensor
- Guide: Integrating window actuators into building management
Not sure which actuator fits? Call us at 040 50694631 (Mon–Fri 8 am–5 pm) or use the actuator finder.
Related terms: Ventilation control (window control) · Modbus · Rain sensor
