| 摘要 |
<p>Apparatus and method for controlling electrically powered liquid-moving pumps, particularly bilge and sump pumps. The apparatus is characterized by the fact that no portion thereof need be located in the hostile environment of the bilge or sump served by the pump controlled thereby. The apparatus comprises a switch (K1') inserted in the power supply circuit of the pump's prime mover (PM), an interval timer stage (1) adapted to provide an ''on'' signal at a preselected time interval, and electrical condition sensing means (19) inserted in the power supply circuit of the pump's prime mover and being adapted to provide an ''off'' signal to a sensed electrical condition of the pump prime mover (PM) upon liquid starvation of the pump and a switch control circuit communicating with the timer stage (1), sensing means (19) and switch (K1') in such manner as to close the switch (K1') at each ''on'' signal of the interval timer stage (1) and to open the switch (K1') at each ''off'' signal of the sensing means (19).</p> |
