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Why to measure CO2?

Sensors in an HVAC environment
Together with the increased thermal insulation of our buildings, the importance of a smart ventilation system is rising in order to maintain a good indoor air quality and to minimize energy losses.

The following parameters have a direct impact on the health, the sense of well-being and the comfort of the residents:
- Temperature
- Relative humidity
- CO2

As a specialist in control solutions for HVAC and ventilation systems, Sentera developed a wide range of sensors – each with its own, specific purpose. To guide you in the process of determining the correct sensor for your application, we will explain these different parameters in detail.

Temperature and relative humidity have a direct impact on the sense of well-being and comfort of the residents.
Dry air leads to dry skin, itchy eyes, and irritated nasal passages. It can cause a bloody nose or an itchy throat and can aggravate symptoms of the common cold and some respiratory ailments. It also increases static electricity, which you feel in your clothes and hair and on furniture and carpeting.

Too high relative humidity degrees will result in condensation forming on windows, walls and ceilings that are colder than the air temperature and potentially damaging building materials and causing odours in poorly ventilated spaces.

Since temperature and relative humidity are the basic parameters that determine the comfort and well-being of residents, most Sentera sensors can measure these.

CO2 - NDIR CO2 sensing technology
Carbon Dioxide (CO2) is not only a by-product of combustion, it is also the result of the metabolic process in living organisms. Because carbon dioxide is also a result of human metabolism, concentrations within a building are often used to indicate whether adequate fresh air needs to be supplied to the space.

Moderate to high levels of carbon dioxide can cause headaches and fatigue, and higher concentrations can produce nausea, dizziness, and vomiting. Loss of consciousness can occur at extremely high concentrations. To prevent or reduce high concentrations of carbon dioxide in a building or room, fresh air should be supplied to the room.

NDIR is an industry term for “nondispersive infrared”, and is the most common and adequate type of sensor used to measure CO2. CO 2 gas molecules absorb the specific band of IR light while letting other wavelengths of light pass through. Finally, an IR detector reads the amount of light that was not absorbed by the CO2 molecules or the optical filter. The difference between the amount of light radiated by the IR lamp and the amount of IR light received by the detector is measured. The difference is proportional to the number of CO2 molecules in the air inside the room.

Ventilation based on CO2-level is interesting in rooms with highly variable occupancy, such as meeting rooms, classrooms, universities, etc.




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