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Appendix A Temperature compensation
Electrical conductivity indicates solution concentration and ionization of the
dissolved material. Because temperature greatly affects ionization, conductivity
measurements are temperature dependent, and are normally corrected to read
what they would be at 25 ºC.
A.1 Compensation to 25 ºC
The MP series handheld meters includes temperature compensation to 25 ºC.
Temperature compensation can be set to KCl, NaCl or 442 solutions or tailored for
special measurements or applications.
A.2 Changes in temperature compensation
Most conductivity meters approximate the temperature characteristics of solutions,
and assume a constant value, such as, 2%/ºC. In fact, KCl temperature
compensation changes with concentration and temperature in a non-linear fashion.
Other solutions change even more. The MP series handheld meters use
compensations that change with concentration and temperature instead of single
average values (Figure 8).
Figure 8
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