The conductivity of a solution with a certain concentration changes with temperature. It should be kept at a constant temperature when making precise measurements, or it can be measured at any temperature, and then converted to the conductivity at 25 ° C through the temperature compensation system of the instrument. The measured values ​​can be compared. However, due to various types, the temperature coefficient of conductivity at different concentrations is different. For example, the temperature coefficient of acid solution is (1.0 ~ 1.6)% / ℃, the temperature coefficient of alkali solution is (1.8 ~ 2.2)% / ℃, The temperature coefficient of salt solution is (2.2 ~ 3.0)% / ℃, and the temperature coefficient of natural water is 2.0% / ℃, so the temperature compensation problem of conductivity measurement is more complicated, or it can be considered that this temperature compensation is insufficient, or There is a large error. For this reason, some conductivity meters do not use a temperature compensation circuit, and what the instrument measures is the conductivity value at that temperature. For a conductivity meter with temperature compensation, if the temperature compensation knob is adjusted to 25 ° C, the instrument has no temperature compensation function, and the measured value is the unconverted conductivity value at the current temperature.
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