Monitoring and Management of Air Quality in School Spaces
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The Issue of CO2 as an Indicator of Air Quality in Classrooms
\nThe quality of the indoor environment in school buildings is a crucial factor influencing the cognitive performance and health of students and teachers. The concentration of carbon dioxide (CO2) serves as a primary indicator of air quality due to its precise measurability and correlation with other pollutants.
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WHITE LED
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– excellent air quality,
\ncomfortable environment
\nfor concentration
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GREEN LED
\n– good air quality
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ORANGE LED
\n– poor air quality, need to ventilate, possible discomfort associated with stale air.
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Specifications of the NLII-CO2-R-5-A Sensor for School Environment
\nThe NLII-CO2-R-5-A sensor represents a comprehensive solution for monitoring and automating ventilation in school spaces:
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Technical Properties
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Acoustic signaling: gentle non-intrusive alert when limit values are exceeded
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Output interface: compatible with most ventilation systems (0-10 V)
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Ability to control window or skylight actuators
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Power supply voltage: 12 V to 24 V AC/DC
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Lifetime: at least 10 years without the need for calibration
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Maintenance-free operation throughout its lifetime
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\nProtronix air quality sensors have a three-stage optical indication, the so-called “TRAFFIC LIGHT” — three LED indicators that clearly indicate the current air quality:
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Effectiveness of Ventilation Management Based on CO₂
\nA properly implemented monitoring and ventilation management system ensures:
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Maintaining CO₂ concentration below 1500 ppm
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Optimization of energy costs for heating and ventilation
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Automation of ventilation without the need for manual intervention
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Proven improvement in cognitive functions and reduction of fatigue
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\nProtronix sensors are fully compatible with 99% of ventilation and recovery units on the market, allowing for seamless integration into existing and newly built HVAC systems in educational facilities.
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Key Findings from Our CO₂ Measurements in Classrooms
\nWe installed carbon dioxide sensors in many classrooms at various schools across the Czech Republic. Our measurements led to a relatively simple conclusion: in poorly ventilated classrooms, the CO₂ concentration rises to unacceptable levels in the vast majority of cases already during the first lesson (sometimes even after the first half hour of teaching) right on Monday morning. And this can reach values between 3,500 and 4,000 ppm.
