![CO<sub>2</sub> monitors](/images/products/categories/3x-luftreiniger/Luftreiniger_CO2-Monitor.png)
In order to maintain control of the room air quality at all times, the practical CO2 monitors signal the current CO2 concentration in the room with traffic light colours. The maintenance-free units are self-calibrating and ideal for e.g. classrooms, offices or shops.
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Highlights
![Title](/images/products/categories/3x-luftreiniger/co2-monitor/CO2-Monitor_Schule.jpg)
Helios CO2 monitors as indicators of air quality
- Five level LED display in traffic light colours shows the current range of the CO2 concentration
- Measuring range extends to 0 to 3000 ppm (parts per million)
- Starting from the critical value of 1000 ppm, the CO2 monitor prompts the user to introduce ventilation measures via the yellow warning LED
- An acoustic signal can be switched on optionally
Three versions for maximum comfort:
![Title](/images/products/categories/3x-luftreiniger/co2-monitor/CO2-Monitor_Aufsteller.jpg)
CO2 AP-A: With stainless steel stand holder
CO2 AP-A is ideal as a mobile solution thanks to the power plug with micro USB and high-quality stainless steel stand holder. Simply take it into the desired room, plug it in and feel safe.
![Title](/images/products/categories/3x-luftreiniger/co2-monitor/CO2-Monitor_Aufputz.jpg)
CO2 AP: For surface-mounting
CO2 AP has a power plug and is ideally suited for wall installation.
![Title](/images/products/categories/3x-luftreiniger/co2-monitor/CO2-Monitor_Unterputz.jpg)
CO2 UP: For flush-mounting
CO2 UP is provided with a power supply unit (included in delivery) for flush-mounting. The CO2 monitor is in- stalled in a flush-mounted box.
Your advantages at a glance:
![automatischer Luftwechsel](/images/products/categories/3x-luftreiniger/co2-monitor/Icon_monitor.png)
The CO2 monitor has a traffic light display with five different LEDs which provide information about the concentration of CO2 content in the room air in three colours and graduated brightnesses.
![Heizkosten reduzieren](/images/products/categories/3x-luftreiniger/co2-monitor/Icon_einsatzbereit.png)
The units with power plugs only require one free power socket and are fully operational after one hour at the latest.
![Niedrige CO2 Konzentration](/images/products/categories/3x-luftreiniger/co2-monitor/Icon_wartungsfrei.png)
Helios CO2 monitors are maintenance-free. Even the calibration is fully automated.
![kein Aussenlärm](/images/products/categories/3x-luftreiniger/co2-monitor/Icon_messbereich.png)
CO2 values are measured in the range from 0 to 3000 ppm (parts per million). The room air quality is continuously displayed via the glowing LEDs.