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This system operates much like a classic float switch but without any moving
parts. The illustration shows how a system using two copper coils sealed
inside a plastic pipe, can detect the level of water outside the pipe.
Whenever the water level is lower than the upper coil, no signal is coupled
between the coils. Once calibrated, this technique might also work on the
outside of a plastic water tank.
Click on Drawing Below to view PDF version of Schematic
