Process analyzer for measuring gas composition. In many production processes, especially in the production process where there are chemical reactions, automatic control based on physical parameters such as temperature, pressure, and flow is often not enough. Due to the wide variety of analyzed gases and the variety of analysis principles, there are many types of gas analyzers. Commonly used are thermal conductivity gas analyzers, electrochemical gas analyzers and infrared absorption analyzers.

The gas composition is measured based on changes in the amount of ions or changes in current caused by chemical reactions. In order to improve the selection, prevent contamination of the measuring electrode surface and maintain the electrolyte performance, a diaphragm structure is generally adopted. Commonly used electrochemical analyzers include constant-potential electrolysis and galvanic cell. The working principle of the constant potential electrolysis analyzer is to apply a specific potential on the electrode, and the measured gas will produce electrolysis on the surface of the electrode. As long as the potential applied to the electrode is measured, the specific electrolysis potential of the measured gas can be determined, so that The instrument has the ability to select and identify the gas to be measured. The galvanic cell analyzer electrolyzes the measured gas that diffuses into the electrolyte through the diaphragm, and measures the formed electrolysis current to determine the concentration of the measured gas. By selecting different electrode materials and electrolytes to change the internal voltage of the electrode surface, the selection of gases with different electrolytic potentials is realized.

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