Home > News > Content

Application And Principle Analysis Of Oxygen Sensor

Oct 24, 2017

Oxygen sensor, as the name suggests, an instrument for the detection of oxygen concentration, and feedback of the information to the relevant personnel or equipment. Some people may not be too familiar with this concept, in our daily life, usually it is hidden, such as the most close to our car interior, in fact, the application of oxygen sensors is very wide, for example, in some paper industry, Chemical plants, medicine and so on. Next, I have to introduce you to introduce some of the oxygen sensor works and its application of it.

Oxygen sensor is the standard on the car, it is the use of ceramic sensor components measured in the exhaust gas pipeline oxygen potential, calculated by the chemical balance of the corresponding oxygen concentration, to monitor and control the combustion air-fuel ratio to ensure product quality and exhaust Emission standards for measuring elements. Oxygen sensor is widely used in all kinds of coal combustion, oil combustion, gas combustion and other furnace atmosphere control, it is the best way to measure the combustion atmosphere, with a simple structure, rapid response, easy maintenance, easy to use, accurate measurement The The use of the sensor for combustion measurement and control can not only stabilize and improve product quality, but also shorten the production cycle, saving energy.

The working principle of the oxygen sensor on the car is similar to that of the dry battery, and the zirconia element in the sensor acts like a electrolyte. The basic working principle is: under certain conditions, the use of zirconia inside and outside the oxygen concentration difference, resulting in potential difference, and the greater the difference in concentration, the greater the potential difference. Atmospheric oxygen content of 21%, concentrated mixture of combustion gas is actually no oxygen, dilute mixed gas generated after the combustion of waste gas or emissions due to the lack of oxygen contains more oxygen, but still more than the atmosphere Oxygen much less. Under the catalysis of high temperature and platinum, negatively charged oxygen ions are adsorbed on the inner and outer surfaces of zirconia casing. As the oxygen in the atmosphere than the exhaust gas in the oxygen, the casing on the same side of the air than the exhaust side of the adsorption of more negative ions, the concentration of ions on both sides of the generation of electromotive force.

When the oxygen concentration on the side of the car casing exhaust gas is low, a high voltage (0.6 to 1 V) is generated between the oxygen sensor electrodes, and the voltage signal is sent to the automobile ECU for amplification. The ECU regards the high voltage signal as a rich mixture , And the low voltage signal as a lean mixture. According to the oxygen sensor voltage signal, the computer in accordance with as close as possible to the theoretical best air-fuel ratio of 14.7: 1 to dilute or thicken the mixture. So the oxygen sensor is the key sensor for electronically controlling fuel metering. Oxygen sensor only in high temperature (end to 300 ° C above) its characteristics can be fully reflected in order to output voltage. It reacts to the mixture at about 800 ° C the fastest, and at low temperatures it will change greatly.

Oxygen sensors are widely used in petroleum, chemical, coal, metallurgy, paper, fire, municipal, pharmaceutical, automotive, gas emissions monitoring and other industries.

After the above description, whether you have a more comprehensive understanding of the oxygen sensor? According to my personal experience of knowledge can only provide you with so much information, and perhaps not perfect, but hope that these only The personal information can help everyone. There is no saying: "live to learn old", knowledge endless, but I think in our side, and we are closely related to the knowledge of things should have a general understanding of them.