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The process controller method for the PSS flow rate experiment can be found here (...this does not seem to be linked properly yet).
The following is an overview of how we utilized this software for our apparatus.
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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.