| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump automatic alternating operation control system stabilizing alternating operation and also stabilizing stop near the target stop water level by using two submerged pumps operated and controlled by a single water level sensor. SOLUTION: Each capacity sensor 3A, 3B of both submerged pumps 1A, 1B is mounted keeping a height difference. The system is provided with a start timer starting count by detection of trigger water level TA, TB and a descent time measuring timer measuring a water level descent time until water level descents to trigger water levels TA, TB. The submerged pumps 1A, 1B are stopped after a time defined with the water level descent time as reference elapses. The capacitor sensor 3A of the first submerged pump 1A is put at a higher position than a water level rising before the second submerged pump 1B starts. The second submerged pump 1B functions once per two counts started by detection of trigger water level TB. COPYRIGHT: (C)2008,JPO&INPIT
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