Automation – building a foundation and looking to the future: PRESENTATION ONLY
Andy Thornton, & Richard Addison, Hach, UK
(Free)
Aeration blower control
Fixed dissolved oxygen set point control
- Currently the most commonly used control system. 2 controllers connected in cascade
- Outer loop calculates the required airflow from the difference between the desired DO and the online concentration
- The airflow setpoint is controlled by the inner loop that changes the position of the air valve.