Water-level indicator

  
In this a warning device WD1 is in series with SCR1. When the liquid level causes a conductive path between the probes, the SCR conducts sounding WD1. The warning device may be a Sonalert (TM), a lamp or a buzzer.D1 acts as a transient suppressor.
Water-level indicator - schematic

Press SI to reset the circuit.



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