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EC/TDS Meter

I know I can buy cheap meters to do this. I am looking to learn
however. I understand the concepts behind how they work. Pass a
small ac current through a probe with a known area between the poles
and measure the resistance.

I have a probe with a cell constant of 10.

What I am trying to do is build a circuit that takes 5v-12v input dc,
produces the ac that is sent to the probe and then outputs the
resistance converted to a volate in the range of 0-5v.

I have one schematic I tried and doesn't seem to work. I can share
what I have via email with those willing to help.

I have spent days googling and cannot find much on the net.

Thanks in advance.
 
I know I can buy cheap meters to do this. I am looking to learn
however. I understand the concepts behind how they work. Pass a
small ac current through a probe with a known area between the poles
and measure the resistance.

I have a probe with a cell constant of 10.

What I am trying to do is build a circuit that takes 5v-12v input dc,
produces the ac that is sent to the probe and then outputs the
resistance converted to a volate in the range of 0-5v.

I have one schematic I tried and doesn't seem to work. I can share
what I have via email with those willing to help.

I have spent days googling and cannot find much on the net.

Thanks in advance.

If you put more than a few millivolts across your cell, things are
likely to go pear-shaped.

I'd be happy to llook at your circuit - my e-mail addesss is real, and
I've worked on real conductivity meters.
 
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