The_CO2 level in indoor air is a relevant indicator for assessing a room’s airtightness. In indoor building environments, this molecule is primarily produced by human respiration (exhaled air). A_CO2 level exceeding 1,500 ppm indicates that air exchange is insufficient. If this threshold is exceeded, measures must be taken to improve indoor air quality.

The_CO2 sensor selected by the laboratory is a Class’Air electronic unit, approved by the CSTB for measuring carbon dioxide in the indoor air of public-access facilities (ERP). It is equipped with a high-precision_CO₂sensor (NDIR technology) that offers a resolution of 1 ppm.

Two versions of the Class’Air sensor are available:

- The Class’Air Educational Model: This is the simplest model. It displays real-time readings for_CO2 levels, temperature, and humidity (one measurement every 10 minutes—measurement frequency can be adjusted). It also includes three colored LEDs (green, orange, red) that make it very easy to visualize the_CO2 level, as well as the option to add an audible beep when levels exceed a critical threshold. The thresholds are user-configurable.

- The Class'Air with data logging: Visually, this is the same model as the educational sensor, but it includes a data logging function. You can then easily retrieve the data using the USB drive and the Class'Air software.

The sensor is very easy to move from one room to another since it does not require a power connection (battery-powered).

The Class'Air is factory-calibrated. It is entirely designed and manufactured in France. 

Recommendations from the Ministry of Solidarity and Health

2023 Recommendations from the Indoor Air Quality Observatory

Do you want to measure_CO₂ concentration with a direct reading and monitor changes in humidity and temperature over a period of at least two hours?

The Class’Air sensor is the ideal solution. Simple and intuitive, it allows you to continuously measure_CO2levels, enabling you to identify pollution spikes and/orevaluate the effectiveness ofavailableventilation systems.

It fully complies with the requirements of the December 27, 2022, Decree establishing the conditions for performing direct-reading measurements of_CO2 concentrationin indoor air.

We also offer this high-end sensor for renton this page. You’ll record data for one week and then receive a comprehensive analysis report (with graphs), allowing you to determine whether you need to improve your air exchange rate.

If you operate a public access building (ERP) and wish to conduct measurements in accordance with the decree on indoor air quality monitoring, check out our dedicated analysis kit (QAI Self-Diagnostic Kit for ERPs).

This sensor will allow you to monitor:

• The level of carbon dioxide (_CO2) in the air;
• Room temperature;
• Ambienthumidity;
• Atmospheric pressure.

Real-time monitoring of these parameters will allow you to assess the level of airtightness in your rooms and thereby improve your indoor air quality.

- 1 Class'Air_CO2 sensor (Pyrescom®) - Dimensions: 90 x 100 x 35 mm;

- 1 USB cable for charging the sensor (and retrieving measurements for the version with data logging);

- 1 mounting bracket;

- 1 manufacturer’s calibration certificate;

- 1 user manual;

- 1 access to the Class'Air software for managing measurement campaigns—if you choose the version with data logging.

The sensor is very easy to use. A user manual is provided, explaining how to set the measurement frequency and the threshold values for LED color changes. You can also configure an audible beep to sound when a certain threshold is exceeded.

For the sensor with data logging, the manual also explains how to start and stop data logging.

The sensor has a battery life of approximately 12 months (battery-powered) with a measurement frequency of 10 minutes. For the version with data logging, this battery life may vary depending on usage.

Technical documentation-Explanatory brochure