| 摘要 |
A cascade system of series-connected elements senses and controls liquid levels in these elements and senses and controls flow rates of liquid flowing through the series of elements and also of liquid being received and discharged by the system. A signal corresponding to a change in the flow rate of liquid being received by the system (or discharged by the system) along with at least one acid level change provides control signals (1) to regulate each flow rate of liquid between the elements and (2) to regulate the flow rate of liquid that is to be correspondingly discharged (or received) in accordance with said change. |
