...
The process controller method for the PSS flow rate experiments experiment can be found here.
The following is an overview of how we utilized this software for our apparatus.
...
Varying Flow Rates and Floc Blanket Height
In order to run the system continuously while varying flow rates and floc blanket height, we organized our process controller method into two loops: the first loop to increment flow rates at the low floc blanket height, and the second loop to increment flow rates at the high floc blanket height.
To do this, we used increment and counting functions. The increment function toggled between consecutive flow rates and a reset state; while the counting function regulated the number of flow rates incremented, and directed the path of the system appropriately. For example, once the counting function identified that the reset state had been employed four times, the system was sent to a new state after the fifth flow rate.