Water Pump Relay Controller Circuit


Posted on Feb 5, 2014

By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the `water high` sensor, whereas the longer is the `water low` sensor. When the water level is below both sensors, IC1C output (pin #10) is low; if the water becomes in contact with the longer sensor the output remains low until the shorter sensor is reached. At this point IC1C output goes high, Q1 conducts, the Relay is energized and the pump starts operating..


Water Pump Relay Controller Circuit
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