On 09/30/2014 02:36 PM, Alan Faulkner wrote:
I have a Hanna 98308 TDS meter. Is it accurate for
testing CS PPM?
My problem with TDS (total dissolved solids) meters, is that
they have a rather arbitrary calibration, based on the
assumption that the dissolved solid is some particular salt.
I like a true (EC or electrical conductivity) conductivity
meter. To convert microsiemens per cm conductivity to total
dissolved solids you use a conversion factor to calculate
the dissolved solids value for a specific substance.
http://en.wikipedia.org/wiki/Conductivity_%28electrolytic%29
http://www.tdsmeter.com/what-is?id=0019
Unfortunately, colloidal silver gives a different
conductivity (lower) that ionic silver, for the same
concentration.
But either TDS or EC meters should give consistent and
repeatable results for silver water made by the same method
(where the ratio of colloidal to ionic silver should be
pretty consistent). So if you like the solution you have
made, making it, again, to the same reading, should produce
about the same solution.
--
Regards,
John Popelish
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