The concentration of the CO2 content in the room air is decisive for the quality of the air we breathe. A too high CO2 content reduces performance and increases the risk of illness. In the publication "Recommendation for the necessary air change in schools, open-plan offices, lecture halls and gymnasiums to reduce the risk of aerosol-bound infections" of the RWTH Aachen University, it is shown how strongly an infection risk can depend on various factors. Therefore, the study, as well as the letter "Ventilation in Schools" from the Federal Environment Agency Germany, recommends the measurement of CO2 concentration. The ventilation success depends among other things on the outside temperature and the wind conditions. Particularly at low outside temperatures, there can be significant restrictions on thermal comfort during the ventilation phases. Likewise, a noisy outdoor environment can be detrimental to a learning environment. These factors should be taken into account in a ventilation concept in addition to the CO2 value.
Measurement of indoor air quality
Spectrum of CO2 concentrations relevant for humans
High data security in the measurement of indoor air quality
With the carbon dioxide sensor FYAD 00-CO2Mx the sophisticated ALMEMO® system offers an accurate and traceable measurement for the evaluation of indoor air quality. Besides the CO2 content, temperature and air pressure are measured for automatic compensation. The accuracy of the sensor is +/- 50 ppm +/- 3 % of the measured value.
The FYAD 00-CO2Mx sensor can be attached to any ALMEMO® measuring instrument. For placement at different measuring locations, e.g. in production halls, several sensors can be plugged on, depending on the measuring device, or complex measuring networks can be set up for the acquisition of different measured variables.
Humidity measurement
If ventilation is uncontrolled and too frequent, the CO2 value is correct, but the thermal comfort deteriorates significantly. When temperatures outside fall below zero, the air in the room becomes drier and drier and can cause respiratory tract irritation. Together with temperature fluctuations and immobility at the learning or work place, colds are pre-programmed. Therefore, in addition to the CO2 content, the air humidity, air temperature and possibly also the draught should be measured. With ALMEMO® all relevant parameters can be measured with only one single measuring device.
Logging of the measured values
The ALMEMO® system, which can be calibrated, enables the recording of measured values and is ideally suited as a reference or for checking building services engineering. The values are stored and documented with date and time. By building up a history, individual ventilation profiles can be created. For long-term measurements ALMEMO® data loggers work in sleep mode.
