Russell McMahon wrote:
>
> > I am looking for a reliable way to detect water,
> > although the sensor is covered with a layer of dirt,
> > oil film, etc.  And the water may be pure or contaminated.
>
> Nuclear Magnetic Resonance perhaps?


Thermal conductivity might be the easiest of all
methods. My motorcycle uses thermistors inside
metal tubes in the fuel tank to detect when the
liquid touches them (level).
:o)
-Roman

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