How do you choose the best indoor air quality (IAQ) sensors for your building?

1 Sensor types

Different types of sensors are used to measure and monitor indoor air quality (IAQ). Carbon dioxide (CO2) sensors measure the concentration of CO2, which is an indicator of human occupancy and ventilation adequacy. High CO2 levels can cause drowsiness, reduced concentration and increased risk of infection. Volatile organic compounds (VOCs) sensors measure the presence of VOCs in the air, which are emitted from sources such as paints, cleaners, furniture, carpets and office equipment. VOCs can cause irritation, nausea, headaches and respiratory problems. Particulate matter (PM) sensors measure the amount of fine particles in the air, such as dust, pollen, smoke and bacteria. PM can affect the lungs, heart and blood vessels, and increase the risk of chronic diseases. Temperature and humidity sensors measure the thermal comfort and moisture level of the indoor environment. Temperature and humidity can affect the perception of IAQ, as well as the growth of mold and bacteria.

2 Sensor features

When selecting IAQ sensors for your building, accuracy, sensitivity, durability, connectivity and functionality should all be taken into account. To ensure accuracy, you should review the specifications and certifications of the sensors. Sensitivity should be checked to make sure the sensors can detect and respond to changes in IAQ parameters and have a wide range and resolution. The sensors should also be durable enough to withstand environmental conditions and usage of the building, being resistant to dust, moisture, chemicals and interference. Connectivity-wise, the sensors should be able to communicate with each other and a central system or platform, with support for wireless or wired connections that are compatible with your existing or preferred network and protocol. Functionality-wise, you should look for sensors that are able to perform the necessary functions such as logging, alarming, controlling or reporting, with user-friendly interfaces, customizable settings and options, and integration capabilities with other systems or software.

3 Sensor installation

Once you have selected the best IAQ sensors for your building, you need to install them properly to ensure their optimal performance and accuracy. Planning the location, number, and layout of the sensors should be done according to your objectives, building characteristics, and sensor specifications. Additionally, you should consider the power supply, wiring, and mounting options for the sensors. Testing the sensors before and after installation is important for verifying their functionality, accuracy, and connectivity. You should also calibrate the sensors according to the manufacturer's instructions and standards. Documenting the installation process is essential, including details such as sensor locations, settings, and calibration results. Labeling the sensors is also important, as well as keeping a record of their inventory and maintenance schedule.

4 Sensor maintenance

To ensure the long-term performance and accuracy of your IAQ sensors, you need to maintain them regularly and properly. Cleaning the sensors periodically with a soft cloth or a compressed air canister will help remove any dust, dirt or debris that may affect their sensitivity or accuracy. Additionally, you should replace the sensors or their components when they reach the end of their lifespan or show signs of wear or damage, following the manufacturer's instructions. Lastly, you should recalibrate the sensors periodically using a reference device or a standard gas to compare and adjust the sensor readings.

5 Sensor data

The data collected by your IAQ sensors can provide valuable insights and information for improving the indoor environment and the building performance. It is important to analyze the data to identify trends, patterns, and anomalies of IAQ parameters over time and across locations, as well as compare it with established guidelines and benchmarks. Diagnosing the data to determine the causes and sources of any IAQ issues or problems is also necessary. Furthermore, you should investigate relationships and interactions between IAQ parameters and other factors, such as occupant behavior, building operation or outdoor conditions. Lastly, optimizing the data to implement solutions and actions for enhancing IAQ is essential. You should also monitor and evaluate the impacts and outcomes of your interventions on IAQ and building performance.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?