| 摘要 |
PROBLEM TO BE SOLVED: To constitute a submerged pump control device by simple circuits that are tough against external noise and to improve its sensibility.SOLUTION: This invention comprises a starting water level detection sensor fixed at an upper level side of a submerged pump, a stopping water level detection sensor fixed at a lower level side of the submerged pump, an operation part electrically energizing the stopping water level detection sensor, detecting water temperature, adding a constant temperature T1 to the detected water temperature, determining a target heating temperature at the starting water level detection sensor, adding a constant temperature T2 to the water temperature and determining the target heating temperature of the stopped water level detection sensor, a starting control part and a stopping control part for controlling an applied voltage for applying a DC voltage to the starting water level detection sensor and the stop water level detection sensor or ON/OFF duty ratio.SELECTED DRAWING: Figure 1 |
