Morgan Olsson wrote:
> I=B4ll better use a rare earth metal magnet, as the unit is mobile, and=
 i also want to keep power requirement down.
>=20
> But i don=B4t know anything about this really... how does it work?
> Can i use one sending coil, one magent and a reciever coil placed aroun=
d a tube in which i want to detect water?  How?


Why not use one cheap thermistor attached to
the tube, (as I mentioned in a previous post)
this system is used with great reliability in
my motorcycle fuel tank to detect the difference
in thermal loss from the thermistor when in contact
with the liquid.

It is possible to get SMT thermistors that would
detect tiny quantities of water, and match your
low power requirements.
-Roman

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