Re: Conductivity Sensor

On Sat, 25 Jun 2005 12:39:29 -0700, Luhan Monat wrote:

> Hi,
>
> I'm constructing a Hydroponics system, and need to monitor the
> conductivity of the nutrient solution.
>
> Any suggestions on what to use for the sensors for stable long-term
> readings?
>
I'm wondering why conductivity, specifically. Is it really a good
indication - well, I know it would be a good indication of concentration
of _every_ kind of ion, but wouldn't distinguish between nutrient A
and nutrient B; or then again, are you using a premix and just need
to know when to add a teaspoon of mix or whatever?

But for plain ordinary conductivity, I was going to say platinum,
but that two-toroid idea sounds pretty intriguing.

Good Luck!
Rich


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