Submersible pumps
US4484862A · kind A · utility
14Cited by
11References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1982 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Mar 29, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D9/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for controlling the operation of a pump, especially a submersible pump, and particularly for controlling a water level in connection with cellar drainage pumps, comprises at least one level detector using the principle of acoustic impedance for detecting the presence or absence of liquid to be pumped, said level detector being electrically connected to a control circuit controlling a switching device for the pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.