People sitting around a conference table with Cala KNX IL CO2 mounted on the wall

CO2 sensor technology intelligently integrated into KNX

News of 09 October 2025

Air quality as part of intelligent building automation

A healthy indoor climate is an essential part of holistic KNX projects. Why?

The CO2 content of the air is a key indicator of air quality and comfort. As the concentration rises, attention and wellbeing decrease – a clear signal that fresh air is needed.

With Cala KNX IL CO2, CO2 measurement and indication become part of the building automation system. The device accurately detects the CO2 concentration, evaluates it according to adjustable thresholds and transmits the corresponding signals to the KNX system.

This allows ventilation systems or window drives to respond automatically as soon as air quality declines, and to switch off again once the desired level is restored. The result is a healthy, stimulating indoor environment in offices, schools and smart homes.

Find out more about Cala KNX IL CO2!

See details on Cala KNX IL CO2

What can the CO2 indicator light do?

Functionality

Cala KNX IL CO2 combines sensing, indication and control in one device:

✅ Measures the CO2 concentration of indoor air

✅ Displays values via LED colours (green / yellow / red)

✅ Controls ventilation or window drives via KNX

✅ Can be easily configured in the ETS

Tip: You only need the indicator light function without a CO2 sensor? Then Cala KNX IL is the ideal choice!

For details on the technical settings options for Cala KNX IL CO2, please refer to our technical article "Cala KNX IL CO2: Technical details and settings options". Among other things, you can read about how to connect the CO2 indicator light, which CO2 limit values are stored and what the application of the device looks like.

See technical settings

Cala KNX IL CO2, CO2 indicator light with various coloured LEDs

What are the benefits in your KNX project?

Benefits for your project

With Cala KNX IL CO2, you create an intelligent link between sensing and logic – providing greater comfort and efficiency within KNX systems:

➡️ Air quality measurement directly integrated into room automation

➡️ Reduced wiring effort thanks to combined functions

➡️ Energy savings through demand-based ventilation control

➡️ Flexible use in offices, schools, conference rooms and many other applications

People sitting at a conference table with Cala KNX IL CO2 mounted on the wall

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Cala Series: Consistent design, many applications

The Cala Series offers uniform display and sensor modules for a wide range of KNX system requirements.
All variants share a coordinated design and can be used flexibly for different applications.

Your benefits:
⭐ Consistent glass design for a cohesive appearance

⭐ Sensor and display modules for different measurement parameters

⭐ Easy integration into 55 mm switch ranges ► Cala models also available for the Swiss system!

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KNX glass push button from the Cala series mounted on the wall

Technical articles

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People are seated around a conference table with Cala KNX IL CO2 mounted on the wall.

Cala KNX IL CO2: Technical details and setting options

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For visualising alerts, warnings and CO2 levels indoors