What is Air Quality Sensors (CO2) ?

Introduction to Air Quality Sensors (CO2)

What is it?

Air quality sensors (CO2) are devices that measure the concentration levels of carbon dioxide in the air inside a building. They detect and monitor the levels of CO2, which can be an indicator of poor ventilation, high occupancy levels or inefficient HVAC systems.

Why we use it?

We use air quality sensors (CO2) to maintain good indoor air quality, improve energy efficiency, control HVAC systems and ensure occupant health and safety.

How it works?

The sensor typically contains an infrared light source and detector, which analyze the absorption of light by the CO2 molecules in the air. The device then calculates the concentration of CO2 based on the amount of absorbed light.

Major brands that manufacture it

Some of the major brands that manufacture air quality sensors (CO2) include Honeywell, Johnson Controls, Siemens, Schneider Electric, and Trane.


There are two main types of air quality sensors (CO2): non-dispersive infrared (NDIR) and metal oxide semiconductor (MOS). NDIR sensors are more accurate and stable, while MOS sensors are less expensive and more sensitive to other gases besides CO2.

How do we select it?

When selecting an air quality sensor (CO2), consider factors such as accuracy, response time, measurement range, power consumption, and communication protocols. Also, make sure the sensor is compatible with your existing HVAC and building automation systems.

How to install it?

Air quality sensors (CO2) should be installed in areas where occupants spend most of their time, such as conference rooms or classrooms. They should be mounted on a wall or ceiling at a height of approximately 4-6 feet, away from any obstructions that could interfere with airflow.

Wire connections required to receive the signals

The wire connections required to receive the signals from an air quality sensor (CO2) may vary depending on the specific device and building automation system. Typically, they will require a power supply connection and a communication signal wire that connects to the building automation system or controller. It's important to refer to the manufacturer's installation instructions for proper wiring connections.

in MEP
What is Air Quality Sensors (CO2) ?
Administrator December 22, 2023
Share this post
Sign in to leave a comment

What is Air Quality Sensors (VOCs) ?
Introduction to Air Quality Sensors (VOCs)