Re: Conductivity sensors


linnix wrote:


When you multiplexed the powers, did you isolate the grounds as well.
Did you have filters isolations for the power supply? Did you isolate
the probes? Treat this as a very noise sensiitive circuit.

Hi,
Yes, I did switch both the power and the ground through the
multiplexer. The other connection was the voltage out, which went into
the A/D. I did not have any filters on my power supply. What sort of
filters would you suggest? Maybe I'll try running it off a battery to
see if that helps.

thanks,
mike

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