Electrochemical principle of sensitive carbon monoxide detector

Carbon monoxide will endanger our human health. If carbon monoxide poisoning is severe, it will lead to death. If we use a sensitive carbon monoxide detector, we can avoid poisoning in advance and save lives. Let us introduce the electrochemical principle of the detector.

When carbon monoxide diffuses into the gas sensor, its output terminal produces a current output, which is supplied to the sampling circuit in the alarm, which plays the role of converting chemical energy into electrical energy. When the gas concentration changes, the output current of the gas sensor of the sensitive carbon monoxide detector also changes proportionally.

A sensor based on electrochemical principles. The principle is that two electrodes are immersed in a conductive solution (electrolyte), and carbon monoxide molecules and water molecules react on one of the electrodes to convert into carbon dioxide and generate hydrogen ions and electrons. This electrode is the work Electrode (W); and the changed product is transferred to another electrode, reacting with oxygen on this electrode to regenerate water molecules, this electrode is the counter electrode (C); these two electrodes are conducted through an external circuit containing resistance, The change in voltage across its resistance can be measured;

Thus, the resulting reaction is the conversion of carbon monoxide into carbon dioxide in the presence of oxygen. Electrochemical principle sensitive carbon monoxide detector is mainly used in industry or places with high accuracy requirements, and its detection accuracy is high.