Water level control circuit for sump pumps and the like

Details Water level control circuit for sump pumps and the like Water level control circuit for sump pumps and the like

1991-11-15

1993-06-01

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

137392, 361178, 340620, 417 36, H01H 3518, F04B 4902

Patent

active

052162885

ABSTRACT:
A control circuit for a sump pump or other pump that controls the liquid level in a vessel. The liquid is maintained between upper and lower levels defined by probes in the vessel. The probes are associated with comparators and connect with one comparator input. The upper limit comparator connects with the gate of an SCR which supplies current to the lower limit comparator and also to a relay which controls the on/off condition of the pump. The output of the lower limit comparator controls a switching transistor which is arranged in a series circuit with the SCR and relay coil. Once the SCR is conductive, it is latched in the conductive state until the transistor is made nonconductive by the lower limit comparator. In a sump pump application, latching of the SCR allows the pump to remain activated after the liquid level is reduced below the upper probe.

REFERENCES:
patent: 3800205 (1974-03-01), Zalar
patent: 4244385 (1981-01-01), Hotine
patent: 4404809 (1983-09-01), Johnson et al.
patent: 4600844 (1986-07-01), Atkins
patent: 4742244 (1988-05-01), Koerner
patent: 4766329 (1988-08-01), Santiago
patent: 4785843 (1988-11-01), Nicholson
patent: 4952914 (1990-08-01), Mueller
patent: 5145323 (1992-09-01), Farr

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