Hi Trem:
` So what's the final formula for the TDS 1???
`Is it half the pwt reading plus 20%.??
Tks.. Grant..
***********************
Hi James, I don't mean to jump in when you addressed the post to Dean
but the fact is that the PWT reads CS much better than the TDS-1 for
several reasons as pointed out on our website. Also, you do NOT divide
by half when using the PWT. You ADD to the reading. In the case of our
generators you add 20%. Hanna is right in telling you to cut the
reading in half IF you're measuring dissolved solids such as minerals in
the water. However, we as CS users are interested in measuring the
content of CS to determine what silver content we have. In this case
the meter only measures the ionic portion of CS. And that reading is
always less than the total amount of silver content because the meter
will NOT read the colloidal portion. Therefore one has to add to the
reading to get the total PPM. The correction factor will be the
difference between how much of the mix was colloidal versus ionic. We
have had our CS analyzed by atomic absorption spectrophotometry and it
is generally always the same ratio. Another thing I forgot to mention is
the fact that the TDS-1 has an accuracy tolerance of + - 2% of full
scale. Since the TDS-1 reads from 0-999 that's + - 20 PPM. Since the
PWT reads from 0-99.9 and has the same percentage of accuracy that's + -
2 PPM. And the PWT gives you a decimal point in the reading while the
TDS-1 reads in whole numbers only. I hope this helps clear up some of
the controversy about the TDS-1 versus the PWT. The PWT is the best
choice hands down for measuring PPM.T
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