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Re: TDS meter: which one ?
In a message dated 3/1/02 2:45:06 PM, yurko at warwick_net writes:
<< The so-called TDS meter measures conductivity and uses a conversion
factor for a "typical" water to express the result as Total Dissolved
Solids. >>
Most instrument manufacturers use potassium chloride as the standard for
converting conductivity to TDS. In that case and that case only, the
conductivity in microsiemens is exactly 2 times the TDS in ppm. However, no
real water supply system has only potassium chloride in solution. For my
water the conversion factor is about 1.7 times. So when I measure 120 ppm TDS
on my TDS meter, that is really about 200 microsiemens conductivity.
Lee Harper
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