Mainly based on the Karl Fischer Coulomb method, which is a method for determining moisture content using chemical reactions. The basic principle is to react the water in the sample with Karl Fischer reagent (usually composed of pyridine, iodine, sulfur dioxide, and methanol) to produce pyridine hydroxide and methyl hydrogen sulfate. In the presence of pyridine and methanol, water participates in the reaction and consumes iodine. After the water reacts, excess iodine is reduced on the electrolytic anode, resulting in a sudden jump in current or voltage. According to Faraday's law, the amount of iodine consumed during electrolysis is directly proportional to the moisture content in the sample, so the moisture content can be determined by measuring changes in electrolysis current or voltage.

The specific steps are as follows:

Reagent preparation: Inject Karl Fischer reagent into the electrolytic cell of the instrument.

Sample processing: Add the test sample to the electrolytic cell to ensure sufficient contact between the sample and the reagent.

Electrolysis reaction: Iodine is produced through electrolysis and reacts with the moisture in the sample.

Endpoint detection: After the moisture reaction, excess iodine is reduced on the electrolytic anode, resulting in a sudden jump in current or voltage.

Data calculation: Based on the amount of iodine consumed during the electrolysis process, combined with Faraday's law, calculate the moisture content in the sample.

The advantages of solvent moisture analyzer include: high degree of automation: the instrument can automatically complete the titration process, reducing human error. Easy to operate: Users only need to set the relevant parameters, and the instrument can automatically complete the measurement and display the results.

Wide applicability: It can be used for moisture determination of various samples such as liquids, solids, gases, etc.

The solvent moisture analyzer is widely used in industries such as pharmaceuticals, chemicals, food, tobacco, cosmetics, etc., to control product quality, optimize production processes, and ensure safety. For example, in the pharmaceutical industry, precise control of moisture content is crucial for the stability and safety of drugs; In the chemical industry, controlling moisture content can reduce the risk of equipment corrosion and blockage.