Re: Conductivity sensors


mooseo wrote:

How many probes do you need in each unit and how many units are you
planning to build? If building enough units, a low impedence solid
ground plane circuit board would help.

Each unit has a single probe, and for this stage of the experiment,
there will be 8 probes in close proximity, but they will be in separate
waterproof housings.

This is just a pilot project, where I am cabling multiple units to a
single DAQ...

That could be your problem. You are building an antenna, not sensors.
I would put a $2 microcontroller in each probe and transmit the result
via isolated media.

if it works, the next stage will be to build autonomous
loggers that will be battery powered, so no physical connections
between them. Which should eliminate all these problems?

You already verified that this won't work. What else do you need?


Still, I can't justify doing that (designing and building the loggers)
unless I've got some initial data to show the questions are
interesting. This way seemed simple.

Thanks,
mike

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