For cascade control loop, the CO of outer loop will be set point of inner loop which make the inner loop cannot change the set point by itself. So we have to set the faster process to be an inner loop and then, call it that Slave and the slower to be an outer loop which call it that Master. Hence, for this lab, we set the controller of both flow and level loop to manual for finding the respond of this plant. After that, we can approximate response by the first-order plus deadtime which appears in figure below.