Submersible pumps
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United States of America Patent
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-
Nov 27, 1984
Grant Date -
N/A
app pub date -
Mar 29, 1982
filing date -
Apr 9, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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