Oxygen sensor with self-calibration function

Abstract

The invention discloses an oxygen sensor with a self-calibration function. The oxygen sensor comprises a sensor body, a flue gas channel and a reference air channel, wherein the flue gas channel and the reference air channel are arranged in the sensor body. Tshe flue gas channel is a zirconium oxide pipe, a flue gas side electrode is sintered and mounted on the inner side of the flue gas channel,an air side electrode is sintered and mounted on the outer side of the flue gas channel, and the potential difference between the flue gas side electrode and the air side electrode is displayed through an electromotive force measuring instrument; two ends of the flue gas channel are respectively used as a flue gas inlet end and a compressed air recoil end, and compressed air is used for reverselypurging the flue gas channel; the reference air channel is arranged on the outer side of the flue gas channel, the air side electrode is arranged in the reference air channel, and reference air is introduced into the reference air channel and used for being compared with the oxygen content of compressed air for self-calibration. According to the invention, the self-calibration function of the oxygen sensor is realized through the comparison of the backflushing compressed air and the oxygen content in the reference air in the reference air channel, and the measurement accuracy of the oxygen sensor is ensured.

Description

technical field [0001] The invention belongs to the technical field of measurement and relates to an oxygen sensor with a self-calibration function. Background technique [0002] At present, zirconia is generally used to monitor the oxygen content in the boiler exhaust gas. In actual use, due to the corrosive gas SO contained in the boiler exhaust gas 2 etc., contain a certain amount of alkali metal, high dust content, especially dust and alkali metal are easy to bond on the surface of the zirconia probe, and the water and SO in the flue gas 2 Sulfuric acid radiation will form on the surface of the probe. All these will cause the value displayed by the zirconia oxygen sensor to drift, which will have a large deviation from the actual oxygen content. In addition, because the existing zirconia oxygen sensor is used in a harsh oxygen environment, its service time is relatively short. During the operation, it was found that the oxygen sensor display of some circulating fluidi...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above research status and existing problems, the present invention provides an oxygen sensor with a self-calibration function, which is used to solve the problem that the existing oxygen sensor cannot issue a warning or the calibration accuracy is low when the temperature is in the The measurement of flue gas between 300 and 1000 °C can effectively improve the measurement accuracy and has a self-calibration function

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