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Sump Pump Controller, Corrosion Resistant
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Every sump pump controller that I have seen on the web uses DC to sense the water.  This approach is simple, but eventually causes corrosion of he sensor probes due to the electrolysis.  The probes than have to be periodically cleaned or replaced.  This circuit solves the problem by using AC to sense the water in the sump.

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More:  Water-Level Monitors Liquid-Level Sensing CircuitsWater Sensing Circuits

 

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