This type circuits come as science models , even engineering students make to show . While in demo it looks fine , the circuit is as follows ....
lets list the problems
- The 9v cell is not solution it will drain in 20days
-the probes will be damaged by water corrosion
-the wires may catch noise and give very wring reading
- very costly 6wire wiring for high tanks
Our solution
-2 wire sensing
-touch to read , saves battery for 2 years
-probes made of graphite
-very low cost like 40Rs
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