A valve cannot open more than all the way. A pump cannot go slower than stopped. Yet an improperly programmed control algorithm can issue such commands. Herein lies the problem […]
The control objective for the jacketed reactor is to minimize the impact on reactor operation when the temperature of the liquid entering the cooling jacket changes (detailed discussion here). As […]
Many process control practitioners tune by “intuition,” fiddling their way to final tuning by a combination of experience and trial-and-error. Some are quite good at approaching process control as art. […]
When exploring the capabilities of the P-Only controller in rejecting disturbances for thegravity drained tanks process, we confirmed the observations we had made during the the P-Only set point tracking study […]
We investigated P-Only control of the heat exchanger process and learned that while P-Only is an algorithm that is easy to tune and maintain, it has a severe limitation. Specifically, […]
Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump). […]