Temperature compensation and TDS derivation
54
3. Set the temperature compensation to an expected value (see section 3.12 on
page 20).
4. See if the compensated value is the same as the 25 ºC value.
5. If the value is not the same, raise or lower the temperature compensation and
measure again until the 25 ºC value is read.
C.3 TDS ratio of unknown solutions
When the effect of temperature is removed, the compensated conductivity varies
with the concentration (TDS). The ratio of TDS to compensated conductivity for any
solution also varies with concentration. The ratio is set during calibration in the User
mode (see section 3.13 on page 20). Measure the TDS of an unknown solution by
evaporation and weighing. Then measure the conductivity of the solution, with the
now-known TDS, and calculate the ratio. The next time this solution is measured,
the ratio is known.
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