It can be used for samples with different properties such as granular solids, liquids, emulsions, and pastes, and has the advantages of high accuracy, fast measurement speed, and simple operation. Therefore, it is widely used in moisture testing in agricultural products, food, chemical engineering, pharmaceuticals, materials science, and other fields.

The main principle is to react the water in the sample with Karl Fischer reagent to form hydrogen gas. The amount of hydrogen gas is measured by an electrochemical sensor to analyze the water content in the sample.

Measuring moisture is an electrochemical method. The principle is that when the Karl Fischer reagent in the electrolytic cell of the instrument reaches equilibrium, a sample containing water is injected. Water participates in the oxidation-reduction reaction of iodine and sulfur dioxide. In the presence of pyridine and methanol, hydrogen, iodine, acid pyridine, and methyl sulfate pyridine are generated. The consumed iodine is electrolyzed at the anode, and the oxidation-reduction reaction continues until all the water is exhausted. According to Faraday's law of electrolysis, the production of iodine by electrolysis is directly proportional to the amount of electricity consumed during electrolysis.

It has a wide range of applications in many industries, such as pharmaceuticals, chemicals, food, and tobacco. By using solvent moisture testers, these industries can ensure the quality and safety of their products, while also effectively controlling the moisture content during the production process and reducing production costs.