The total TDS is a mass estimate
and is dependent on the mix of chemical species
as well as the concentration while conductivity
is only dependent on the concentration of
chemical species. Some applications require
the measurement of Total Dissolved Solids
(TDS) in mg/L, parts per million (ppm) or
parts per thousand (ppt). The TDS concentration
can be obtained by multiplying the conductivity
value with a factor which is empirically determined.
Eutech offers meters that allow the direct
reading
of TDS values. These include the TDSTestr™
series, EcoScan TDS 6, CyberScan Standard
Portables
CON 11, CON 110 and Waterproof Portable CON
410. Bench meters for advanced level laboratory
research are the CyberScan CON 510, CON 1500
and colour touchscreen research-grade CON
6000.
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