Temperature compensation of conductivity meter

The conductivity of a solution with a certain concentration changes with changes in temperature. It should be kept at a constant temperature for precise measurements, or it can be measured at any temperature, and then converted to conductivity at 25°C by the instrument's temperature compensation system. The values ​​can be compared.

However, due to various types, the temperature coefficient of conductivity varies at different concentrations. For example, the temperature coefficient of the acid solution is (1.0-1.6)%/°C, and the temperature coefficient of the alkali solution is (1.8-2.2)%/°C. The temperature coefficient of the salt solution is (2.2-3.0)%/°C, and the temperature coefficient of the natural water is 2.0%/°C, 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 big error.

For this reason, some conductivity meters do not use temperature compensation circuits, and the instrument measures the conductivity value at the current temperature. Temperature-compensated conductivity meter, 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.