You will notice that whatever the conductivity of a solution is quoted it is usually referred to a temperature. This is because the conductivity of a solution varies not just with the amount of dissolved salts, but also with temperature. If the conductivity measurement is going to be used to determine for instance the concentration of sulphuric acid it is essential that the temperature effect is eliminated. This is achieved by measuring the solution temperature and compensating the conductivity measurement to the reading that would be given at a standard temperature. This is usually 25°C.

Different solutions will have different coefficients in the order of 1-3 %/°C. The temperature compensation will be quoted in %/°C and to a base temperature. When comparing different conductivity readings on different instruments it is essential that the temperature compensation is performed in the same way. A typical compensation rate of 2%/°C is generally used, but where more accuracy is needed a variable coefficient is essential.

It should also be noted that the conductivity of pure water below 0.1 uS/cm (10M°.cm) has a very large and non-linear temperature dependence. In order to obtain accurate readings in this range of measurement it is essential that the instrument has the correct temperature facilities.