BioChem introduced its patented Bioprocess Aeration Control System (BACS) in 2009.
Since then it has proven its effectiveness, efficiency and reliability in dozens of applications as a stand alone subsystem to control the production and distribution of the aeration process. BACS is not the standard proportional integral (PI) loop utilizing high speed trial and error based control actions to chase the desired set-point. Rather BACS is an intelligent system which actually calculates the volume of air required to maintain the DO setpoint by analyzing the process metabolism in real-time. In fact, because of system response times, it is necessary to know what the oxygen demand will be 15 minutes from now in order to effectively maintain the proper DO concentration. BACS does this. It has a Predictive element in its nature.
With BioChem's EDI partnership a new more holistic concept to process design and control was introduced. This new concept called Symphony considers all the critical subsystems required to control the biological treatment process utilizing digitized intelligence throughout. The goal is to achieve unprecedented economy and performance while providing practical, actionable information to manage the plant by incorporating such features as fault detection and isolation (FDI) and Reliability Centered Maintenance (RCM).
Within the Symphony framework, we decided that it was more informative for our systems' names to describe not merely the "what" they do, such as Bioprocess Aeration Control, but the "how and why", such as Predictive Aeration Logic (PAL). As mentioned above, to control something like the DO level in a very complex, dynamic and nonlinear process, you need to be predictive. You need a PAL. BACS = Your PAL.