The core component of an electrochemical oxygen analyzer is an electrochemical oxygen sensor. Common electrochemical oxygen sensors consist of a sensing electrode (or working electrode) and a counter electrode, with a thin electrolyte layer between them. The gas to be measured first passes through a small capillary orifice sensor, then diffuses through a hydrophobic membrane before reaching the electrode surface. The sensor's structural design ensures an adequate amount of gas enters to react with the sensing electrode, producing sufficient electrical signals, while also preventing electrolyte leakage from the sensor. As the gas diffuses into the sensor through the hydrophobic membrane, oxidation/reduction reactions occur at the sensing electrode. A resistor is connected between the electrodes, so a current proportional to the oxygen concentration is generated between the cathode and anode. By detecting this current, the oxygen concentration in the gas is indicated.