Detection method and equipment of gas sensor

Abstract

The invention provides a detection method and equipment of a gas sensor. The gas sensor comprises a working electrode, a reference electrode, a counter electrode and an ionic conduction electrolyte which is communicated with the three electrodes. The equipment comprises a voltage driving module, a current driving module and a voltage detection module, wherein the voltage driving module is used for applying first reference voltage and second reference voltage to the reference electrode and the working electrode respectively, so that the gas sensor works in the constant-potential mode; the current driving module is used for providing working current needed by working of the counter electrode and the working electrode; and the voltage detection module is used for detecting the open-circuit potential difference between the counter electrode and the working electrode, judging that the gas sensor is normal if the open-circuit potential difference falls into a preset voltage range, and otherwise, judging that the gas sensor fails. According to the invention, the effectiveness of the gas sensor can be detected with a relatively simple method and circuit structure.

Description

technical field [0001] The invention relates to gas sensor detection technology, in particular to a gas sensor detection method and equipment. Background technique [0002] Electrochemical gas sensors generally consist of two or three electrodes and an electrolyte connected to each electrode. For a three-electrode sensor, three electrodes are generally included: a reference electrode, a working electrode, and a counter electrode. The gas sensor works in the constant potential mode, that is, the potential difference between the working electrode and the reference electrode is constant, and the generated current is proportional to the concentration of the gas to be detected, such as carbon monoxide, hydrogen sulfide, oxygen, etc. When there is a gas leak, if the sensor fails and doesn't work properly, and we don't know that the sensor has failed, it is dangerous at this time. [0003] A variety of different methods and devices have been proposed in the prior art to detect ga...

AI Technical Summary

Problems solved by technology

However, these methods have many inconveniences. In actual operation, the staff must regularly perform ventilation tests on each sensor, which is time-consuming and labor-intensive.

If the gas sensor fails, you can only know it until the next detection, which has great potential danger, especially for the working environment with toxic or explosive gas

[0006] In addition, the problem of sensor leakage is generally discovered only when the instrument is corroded. At this time, the loss is huge, and the instrument can only be scrapped.

The method of US patent US6428684 makes the gas sensor more complicated, and the method proposed by the above-mentioned other patents is also very complicated on the circuit

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