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On-Demand Webinar:

How to Choose the Best CO2 Sensors for Your HVAC Needs

This webinar presents a short review of which factors to consider when choosing CO2 sensors for your HVAC project.

Date: November 1, 2017
Time: 10 AM EDT (7 AM PDT)
Duration: 1 hour
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In addition to temperature and relative humidity, CO2 is one of the most central measurements in modern building automation systems. CO2 is used in demand controlled ventilation to optimize energy consumption by adjusting the amount of fresh air introduced into the building according to the number of people. This presentation will go through the requirements for the CO2 sensors in different standards and certification schemes like ASHRAE 90.1 and LEED.

Another viewpoint that is gaining importance is how the CO2 concentration in itself will affect employee productivity. We will look at some key findings showing how the CO2 concentration affects human performance and productivity. This might in many cases be a much more important to consider than focusing only on energy consumption.

We will also go through some of the specifications and technology choices to consider when choosing sensors for different application and projects. HVAC systems should be designed to work properly not only when commissioned, but during the whole lifetime of the building. This means there needs to be a plan on how to maintain the measurements. Many certification schemes require sensor calibration with at least 5 years intervals.

We will also look into some pitfalls in CO2 measurement in wall, duct and outdoor sensors. Outdoor CO2 sensors need special attention, as a single measurement device may control the fresh air intake for the whole building. As these sensors are subjected to harsh outdoor conditions with high humidity, high wind speeds and varying temperatures you need to choose your instrument carefully.

Key Take-Aways

  • Learn why CO2 control is important in office and other buildings
  • Understand what is said about CO2 sensors in LEED, ASHRAE 90.1 and other standards and certification schemes
  • Learn how to choose appropriate sensors for different projects


Lars Storbom, Product Manager, Vaisala

Lars Stormbom is a Product Manager for Vaisala with over 30 years of experience in industrial and HVAC measurements. He has a background in sensor development and testing, especially the HUMICAP® and DRYCAP® sensors. He holds a Master of Science degree in Technical Physics from the Aalto University of Espoo, Finland.