How to maintain the sensitivity of an oxygen gas sensor in daily use.

2023-03-27 16:45:05

Oxygen gas sensors, especially electrochemical oxygen gas sensor modules, can automatically adapt to environmental changes and automatically calibrate the aging curve of the sensor. They have the characteristics of high sensitivity, good gas selectivity, and strong anti-interference ability, maintaining the detection sensitivity of gas sensors during their lifespan. Oxygen gas sensors are widely used in mining, instrumentation, environmental pollution control, and other scenarios that require O2 gas detection. The oxygen gas sensor can continuously monitor the concentration of oxygen gas in the environment 24 hours a day and transmit real-time information to the monitoring platform, enabling the monitoring of changes in the concentration of oxygen gas at any time and any place.

The working principle of an oxygen gas sensor.

When oxygen gas diffuses through the permeable membrane on the shell and reaches the working electrode surface, oxidation occurs on the working electrode under its catalysis. The H+ ions and electrons generated by the oxidation reaction on the working electrode are transferred to the counter electrode through the electrolyte at a certain distance from the working electrode, and undergo a reduction reaction with the oxygen in the water. Therefore, a reversible oxidation-reduction reaction occurs inside the sensor. This oxidation-reduction reversible reaction always occurs between the working electrode and the counter electrode, generating a potential difference between the two electrodes. However, the polarization at both electrodes limits the range of detectable oxygen concentration, since reaction on both electrodes may affect the potential difference between them, which is difficult to maintain constant. To maintain a constant potential difference, a reference electrode is introduced. In a three-electrode electrochemical gas sensor, the output reflects the potential difference between the reference electrode and the working electrode. Since the reference electrode does not participate in oxidation or reduction reactions, it can maintain the potential difference (i.e., constant potential), which directly correlates with the change in oxygen concentration. When the gas sensor generates an output current, its magnitude is proportional to the gas concentration. By measuring the output current of the sensor through the electrode external output wires and external circuit, the oxygen concentration can be detected with a wider linear measurement range. In this way, by connecting the signal acquisition circuit and the corresponding conversion and output circuits to the gas sensor, oxygen gas detection and monitoring can be realized. Oxygen gas sensors are precise industrial electronic instruments, which can be easily affected by the external environment during use, leading to inaccurate detection data and shortening the service life of the sensor

In daily use, it is important to maintain the detector and preserve the sensing sensitivity of its sensor. The maintenance process should pay attention to the following aspects:

1)Regularly check the working condition of the oxygen gas sensor to ensure its normal operation.

2)Clean the surface frequently to prevent interference from pollutants such as dust and deposits. Clean with a clean cotton cloth or paper towel.

3)Avoid placing the sensor in high temperature, humid, or corrosive environments to maintain its normal working environment.

4)Avoid external interference, such as electromagnetic interference or mechanical vibrations, to ensure the accuracy of detection results.

5)When the sensor is not in use, store it in a dustproof, moisture-proof, and temperature-stable place, and avoid collisions or damage.

By following the above maintenance methods, it is possible to ensure the long-term effective operation of the oxygen gas sensor and better meet daily use needs.

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