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  • Products

    Actuators

    • Actuator Sizing and Selection
    • Non Fail-Safe Actuators
    • Fail-Safe Actuators
    • Actuators for Harsh Environmental Conditions
    • Fast Running Actuators
    • Linear Actuators
    • Fire Damper Actuators
    • Smoke Control Damper Actuators
    • Variable Air Volume
    • Valve Actuators
    • Accessories

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    • Valve Sizing and Selection
    • Belimo Energy Valve™
    • Pressure Independent Control Valves
    • Zone Valves
    • Characterised Control Valves
    • Ball Valves
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    • Globe Valves
    • Valve Actuators
    • Accessories

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    • Sensors/Meters Selection
    • Duct Sensors (Air)
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    • Belimo Energy Valve™ with TEM
    • Accessories

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    • Make the Most Out of It
    • Upgrade Your System
    • Start with Minimal Effort

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    • Building IoT
    • Indoor Air Quality (IAQ)
  • Support

    Tools

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    • Actuator Sizing and Selection
    • Valve Sizing and Selection
    • Sensors/Meters Selection
    • RetroFIT+ Product Replacement Tool
    • RetroFIT+ App
    • Belimo Display App
    • Belimo Assistant 2
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  1. Home
  2. Sensors/Meters

Air quality sensors

Intelligent air quality sensors for HVAC systems

Air quality sensors from Belimo, such as CO2 and VOC sensors, guarantee optimal indoor air quality (IAQ), increased comfort, and maximised energy savings in buildings. Multisensors with integrated temperature and humidity measurement are also available.

​​​​​​​Features

  • A dual-channel CO2 sensor based on NDIR technology. The additional reference channel enables reliable compensation for long-term drifts and temperature drifts, ensuring maximum accuracy and long-term stability. 
  • Our wide range of combined multisensors for CO2, humidity, temperature, and VOCs offers reduced labour and material costs. 
  • The dual-channel self-calibration technology enables the use of Belimo CO2 sensors in all buildings and applications, even where the Automatic Background Calibration (ABC) method cannot be used. 

Innovation for peace of mind

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Seamless

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Reliable

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Product range

Duct sensors
 

22DTC

CO₂22DC Series

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22DTC

CO₂ / Temperature22DTC Series

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22DTM-new

CO₂ / Humidity / Temperature22DTM Series

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22DTC

CO₂ / VOC22DCV Series

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22DTC

CO₂ / VOC / CO₂ + VOC / Temperature22DCK Series

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22DTC

CO₂ / VOC / Temperature22DCM Series

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Room sensors
 

Room-unit-AP_P-22RT-D_900X510

Room operating unitsP-22RT..D

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Room-unit-AP_P-22RT-A_900X510-2

Room operating unitsP-22RT..A

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Room-unit-AP_22RT_22RTH_900X510

Temperature / Humidity / Dew Point / CO222RT, 22RTH & 22RTM Series

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IAQ_sensors_900X510

Indoor Air Quality SensorsEXT-KA Series

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Elevate indoor air quality with high-performance HVAC sensors

Air quality sensors play a crucial role in modern HVAC systems, delivering real-time data on indoor environmental conditions to ensure health, comfort, and energy efficiency. Belimo air quality sensors provide accurate, continuous measurement of CO₂, total volatile organic compounds (TVOCs), and other environmental parameters such as temperature and humidity — enabling precise control strategies in commercial, industrial, and institutional buildings.

Key benefits of air quality sensors in HVAC

Belimo air quality sensors deliver a range of advantages for building performance and environmental health: 

  • Demand-controlled ventilation (DCV)

    Adjusts airflow based on real-time CO₂ and VOC levels, reducing energy waste and enhancing occupant comfort. 

  • Health & safety compliance

    Supports IAQ standards in schools, hospitals, offices, and public buildings.

  • Improved comfort

    Maintains ideal CO2 and humidity levels for enhanced cognitive function and well-being. 

  • System efficiency

    Prevents over-ventilation and associated energy costs by optimising air exchange rates. 

  • Seamless integration

    Output formats include Modbus, BACnet, 0...10 V, and 4...20 mA for plug-and-play use in BMS platforms. 

  • Long-term stability

    Designed with advanced sensing elements and auto-calibration for consistent performance over time. 

Typical applications of Belimo IAQ sensors

Belimo air quality sensors support a wide range of HVAC applications, including:

  • Commercial buildings

    Offices, schools, hotels, and retail environments for occupant comfort and energy optimisation. 

  • Healthcare facilities

    Ensures clean and compliant air in patient rooms, waiting areas, and laboratories. 

  • Education & public buildings

    Monitors IAQ in classrooms and auditoriums to promote cognitive performance and health. 

  • Smart buildings

    Forms the backbone of intelligent HVAC systems enabling real-time data-driven control and reporting. 

Selecting the right air quality sensor

When selecting an indoor air quality (IAQ) sensor for HVAC systems, consider the following:

  • Measured parameters

    Choose sensors that monitor CO2, TVOCs, temperature, humidity, or a combination, depending on the application. 

    Product series:

    • CO2 
    • CO2 + Temperature
    • CO2 + Temperature + Humidity
    • CO2 + VOC 
    • CO2 + VOC + Temperature 
    • CO2 + VOC + Temperature + Mix CO2/VOC 
  • Sensor placement

    Use duct sensors for system-level monitoring and room sensors for zone-based control. 

  • Sensor technology

    Choose ABC sensors when your building has regular fresh air cycles. Use dual-channel sensors when continuous occupancy or low ventilation does not provide that reference.

    ABC sensors (Automatic Baseline Correction)
    Best for applications where a regular fresh air reference is available (e.g. spaces that are ventilated daily). They automatically adjust to ensure long-term stability and accuracy.

    Dual-channel sensors
    Ideal for applications where a fresh air reference is not guaranteed. These sensors use an internal reference channel within the device to provide reliable and precise measurements, even in continuously occupied spaces.

  • Measurement accuracy and range

    Ensure the sensor’s measurement range and precision meet the project’s IAQ requirements. 

  • Output signal compatibility

    Match analogue or digital output to your BMS or control system. 

  • Environmental durability

    Use housing with appropriate IP ratings for indoor or exposed locations.

More questions on air quality sensors?

Contact your partner

More sensor topics

BELIMO_Application-Sensor-Water-1-RGB

  • Learn more about temperature sensors
Belimo_sensors_temperature_humidity_960px

  • Learn more about humidity sensors
Pressure Sensor

  • Learn more about pressure sensors

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