When installing sensor-controlled ventilation, there are a variety of strategies and algorithms to choose from. Depending on who you are (an OEM developer, a system developer, a distributor), we need to discuss what strategies you want to apply.
A sensor will deliver a signal strength depending on CO2 variables. The frequency of measurements depends on your needs and energy savings.
Here are some different strategies:
Most likely, our sensors end up in PID controlled systems (for more information on PID, see below), as they are suitable in multi-zone buildings that have high variables and unpredictable patterns of occupancy.
Helpful links ("PID for dummies"):
CO2 controls the damper with a set point and when ventilation reaches the correct level, the sensor closes the damper. This strategy works well in applications like schools, theatres, and conference rooms where the occupancy can vary greatly from one minute to the next.
This strategy works with the difference between outside and inside air. For example, the setting point can be 100 ppm over outside level. When the desired CO₂ level is reached, the control eases up on “the gas pedal”.