Dave
As you are probably aware, one unit is the reciprocal of the other. As a
rough guide, you can say that the ionic contaminants in your water are
roughly proportional to the conductivity, if you offset the minimum
value of 0.056 µS-cm (at 20°C). Practically, therefore, if your scale
is, say, 0 to 10 µS-cm, it is approximately linear to the contaminants.
On the other hand, if your resistivity scale is 0 to 20 Mohm-cm, your
most useful part will be non-linearly cramped up between, say, 10 and 18
Mohm-cm and a relatively large change in contaminants will result in a
small change in reading at the upper end. Go for conductivity, every
time.
Brian
Dave Abbott wrote:
>
> Hi Technet members
>
> I have a stencil and mis-print cleaner on-site which has a water
> purification circuit attached. It consists of a Carbon and a D.I. cylinder
> and I need to plumb in a meter for measuring the purified water. I have
> only ever used resistivity systems previously, but have now discovered
> conductivity meters. The only thing I have been told about them is that
> they can measure to a tighter degree than resistivity meters. If anybody
> can enlighten me unto which system would suit my application best, then it
> would be greatly appreciated.
>
> Thanks in advance
>
> Dave Abbott
> Manufacturing Engineer
> Marconi Communications
>
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