| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic operation device for a submerged motor- driven pump to dispense with lead-out of the lead wire of a float by a long length even when a control width of a liquid level is high, be stabilized in float inclination operation, and perform high-precise control of a liquid level by a single float type level sensor. SOLUTION: An automatic operation circuit 3 for a pump motor M is contained in a holding body 1 for a float type level sensor 2, the holding body 1 is mounted on a pump P, the pump motor M is started by a starting level detecting signal through upward inclination operation of a float type level sensor 2 during a rise of a liquid level. Based on a time t1 required for detection of a switch liquid level detecting signal through downward inclination operation of the level sensor 2 due to lowering of a liquid level after the staring of the pump motor M, a time t2 required for lowering to a given stop liquid level L is computed. Operation of the pump motor M is continued within the limits of the computed time t2, and a circuit is set such that the pump motor is stopped because of a time being up.
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