Monitoring indoor air quality (IAQ) is crucial for maintaining a healthy environment for building occupants. Advancements in air quality monitoring technology have greatly expanded the range of features and sensitivity in data collection.
When selecting an air quality sensor, consider the following criteria to ensure optimal performance:
Measurement Parameters:
Global building standards recommend monitoring various pollutants in regularly occupied spaces at least once an hour. Key parameters include:
- Particle matter in different sizes (e.g., 2.5 and 10 µm)
- Carbon dioxide (CO2)
- Total volatile organic compounds (TVOC)
These parameters can be reliably measured with suitable accuracy and cost-effectiveness. Additionally, some standards recommend monitoring specific volatile organic compounds, formaldehyde, nitrogen dioxide/oxides, ozone, radon, and airborne microorganisms. However, these may require more complex and costly equipment. In the absence of known exposure risks, focusing on easily measurable parameters like CO2, TVOCs, and PM is typically sufficient.
Modern indoor air quality sensors integrate CO2, TVOCs, PM, humidity, and temperature monitoring capabilities into a single device, offering cost-effective installation and comprehensive monitoring.
Accuracy and Longevity:
Selecting an air quality monitor that offers precise and durable performance is paramount.
Commercial building sensors typically employ two primary detection methods: MOS-based chemi-resistors and non-dispersive infrared (NDIR) technology.
MOS sensors are cost-effective and energy-efficient but can be susceptible to fluctuations in temperature and humidity, potentially limiting their sensitivity. Over time, electrochemical and MOS sensors may experience electron loss, leading to "drifting" readings where the displayed values deviate significantly from the actual air quality. Lower-quality monitors may experience faster drift due to inferior components, often requiring replacement every 6 to 12 months.
NDIR sensors, on the other hand, are renowned for their accuracy and reliability, offering superior stability and a wide measurement range throughout their typical lifespan of 10 to 15 years. NDIR sensors currently represent the longest-lasting option available in the market. Although electrochemical and MOS sensors have made advancements, they still lag behind NDIR technology.
Some sensors may exhibit cross-sensitivity bias, where certain substances, such as water vapor, alter the sensor's electrical properties and readings. Opting for NDIR sensors can mitigate this issue.
Moreover, the accuracy of air quality monitors depends on meticulous calibration during the manufacturing process. High-quality monitors undergo rigorous calibration and testing procedures to ensure consistently precise readings. It's advisable to inquire about the manufacturer's quality control measures to ascertain the reliability of their sensors.
Data Accessibility and Integration:
Opt for sensors that offer convenient and secure access to data. While many sensor providers offer software for data analysis, it often entails recurring subscription costs and data ownership concerns. If your goal is to integrate with your existing data platform or automate HVAC processes, prioritize sensor providers that facilitate seamless data integration with your preferred system.
Pulse sensors are designed to be system-agnostic, empowering you with complete control over your data. This flexibility enables you to seamlessly integrate the data into any IoT cloud platform or smart system of your choice. Sensor data is transmitted securely to your selected IoT server via your network or 4G connection, eliminating the need for middleware or subscription fees. This capability enables you to incorporate real-time data into any software application or intelligent building control system effortlessly.
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