On Mon, 4 Aug 1997, Paul B. Webster wrote:


>   I am visualising something like a pipe through which the liquid
> passes, forming the reference electrode, and containing a central
> sense electrode which connects fairly directly with the measurement
> circuit, itself encased in a shield attached to the outer reference
> "pipe".  Something similar would seem to be in order whether the
> shield was grounded or isolated.

Just to clarify the situation:

In this case, I'll be measuring solutions in a small plastic resevoir,
about bathtub sized. The measuring device is hand held, and will just be
dipped into the resevoir.

-Shane.