Years ago, the control system and process control equipment were often little more than an afterthought assigned to a local contractor (who knew almost nothing about the process he was trying to control) and an overworked in-house engineer. Those days ended with the realization that the modern control is far more than a fancy digital version of an ON/OFF switch.
With the technology available today in sensors, integrated PID control logic, intelligent valves and central SCADA systems, every function in your processing system can be automated to operate at a terrific level of accuracy. But as accuracy increases, costs rise, too and at an even faster rate. And this is where the most important balance of all becomes apparent: the balance between the accuracy that can be achieved and the accuracy needed.