Sensors
Sensors are devices that detect and measure specific environmental parameters, such as temperature, humidity, or the concentration of pollutants in the air. In the context of indoor air quality (IAQ), sensors play a crucial role in monitoring and assessing the conditions within buildings.
Types of Sensors
There are various types of sensors used for IAQ monitoring, each designed to measure different parameters:
- Carbon Dioxide (CO2) Sensors: CO2 sensors measure the concentration of carbon dioxide in the air, which is a good indicator of ventilation effectiveness. High CO2 levels can indicate poor ventilation and potential buildup of other pollutants.
- Volatile Organic Compound (VOC) Sensors: VOC sensors detect the presence of volatile organic compounds, which are chemicals emitted from various sources like building materials, furniture, and cleaning products. Some VOCs can have adverse health effects.
- Particulate Matter (PM) Sensors: PM sensors measure the concentration of particulate matter in the air, which are tiny particles that can be inhaled and cause respiratory and cardiovascular problems. PM2.5 sensors specifically measure fine particles that are 2.5 micrometers or smaller in diameter, which are of particular concern for health.
- Temperature and Humidity Sensors: These sensors measure the temperature and relative humidity of the air, which are important factors for thermal comfort and can influence the growth of mold and other biological pollutants.
Low-cost sensors
Low-cost sensors have become increasingly popular for IAQ monitoring due to their affordability and ease of use. These sensors typically utilize electrochemical or optical sensing technologies to measure various parameters. While they may not be as accurate as professional-grade equipment, they can provide valuable insights into IAQ trends and help identify potential issues.
Importance of Sensor Calibration and Validation
To ensure the reliability and accuracy of IAQ data, it is crucial to calibrate and validate sensors regularly. Calibration involves comparing the sensor's readings to a known reference standard to adjust for any discrepancies. Validation involves testing the sensor's performance in real-world conditions to ensure it is functioning correctly.
EDIAQI's Role in Sensor Evaluation
The EDIAQI project is actively involved in evaluating the performance of various low-cost sensors in different indoor environments. The project aims to provide recommendations on the most suitable sensors for IAQ monitoring and develop guidelines for their proper use and maintenance.
| Aranet 4 | |||
| Awair Omni | |||
| CO2Panel PI | |||
| Dioxcare | |||
| Extech CO1O | |||
| Foobot | |||
| Interoperability | |||
| PCE-VOC 1 | |||
| SensorThings API | |||
| URADMonitor MODEL A3 | |||
| Wöhler CDL 210 |