On 10/10/07, 556RECON <556recon@charter.net> wrote:
>
> Paul & Lynn Tyrer wrote:
>
> >Have you considered a 1 -wire network. I guess what you could do is
> string a
> >load of temperature sensors and monitor the difference in temperature.
> >Assuming though that the water would be a different temperature to the
> air
> >in the well cavity. This could be connected to a PIC to monitor them and
> >then download to a pc when connected. The 1 Wire run could easily do the
> >distance.
> >Hope this helps.
> >
> >Paul
> >
> >
> We worked on a project such as this.
> We found that without the air circulating in the well the air and water
> temp. were the same at least 10 FT above the water.  But at that time we
> used a digital water temp. thermometer for water temp. for fishing. it
> would only read in whole numbers and not fractional degrees.



I think the only way to do it with thermistors would be to self heat them
a little. I bet the thermistor in air would heat a lot more than the one in
water

John La Rooy
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