Sulfur dioxide (chemical formula: SO2),Also known as sulfite anhydride, is a common sulfur oxide, the main component of sulfuric acid feed gas. Sulfur dioxide is a colorless gas with a strong pungent odor and is one of the main pollutants in the atmosphere. Volcanoes emit the gas when they erupt, and sulfur dioxide is also produced in many industrial processes. Since both coal and petroleum usually contain sulfur compounds, sulfur dioxide is produced when burned. When sulfur dioxide is dissolved in water, sulfurous acid (the main component of acid rain) is formed. If SO2 is further oxidized in the presence of a catalyst such as nitrogen dioxide, sulfuric acid (H2SO4) is formed.

Sulfur dioxide is a typical acid gas and basically meets all the characteristics of acid gas. Most acid gases are harmful, such as nitrogen oxides, chlorine and so on. Sulfur dioxide is a medium toxic substance, which is very harmful to the human body, and can cause great trauma to the human body in a small dose. In the atmosphere, sulfur dioxide will be oxidized to form sulfate mist or sulfate aerosol, which is an important precursor of environmental acidification. The concentration of sulfur dioxide in the atmosphere is0.5ppmThe above has potential effects on the human body;1~3ppmWhen most people begin to feel stimulated;400~500ppmPeople will develop ulcers and pulmonary edema until death from asphyxia. Moreover, sulfur dioxide gas is produced in many steps of industrial production. For example, a large amount of sulfur dioxide is required in the preparation process of sulfuric acid, and low-quality undesulfurized coal also produces sulfur dioxide gas. Sulfur dioxide gas is even present in automobile exhaust. With the rapid development of economy, people have more and more cars, and the pollution effect caused by automobile exhaust is becoming more and more obvious. The concentration level of sulfur dioxide gas in the air is becoming more and more popular. How to effectively monitor sulfur dioxide gas is also a problem we are facing. The monitoring and detection technology of sulfur dioxide gas concentration has been paid more and more attention.

Electrochemical sensor detection method: The principle of electrochemical sensor is to use the electrochemical oxidation process of the working electrode potential of the gas to be measured in the electrolytic cell. The current generated by the electrochemical reaction of the gas to be measured is proportional to its concentration and follows Faraday's law. The concentration of the gas to be measured can be determined by measuring the size of the current.

The advantage is cheap and safe, but the disadvantage is that the accuracy of electrochemical reaction is greatly affected by the outside world. With the rapid development of the electronic industry, the accuracy of the sensor is getting higher and higher, and the electrochemical sensor method is more and more popular.

In short, different occasions need different methods to detect, and electronic is the general trend of the times, more convenient, fast and safe. For sulfur dioxide gas to achieve effective detection, in order to protect public health.

ApolloCompany Agent of the United KingdomAlphasenseTwo-year conventional electrochemical principleSO2-AF/BFSensor, professional for detectionSO2Gas emissionAlarm, with good stability, high sensitivity, fast response and high cost performance.

The main performance parameters are as follows:

1.   Test range:0-50ppm

2.   Sensitivity:300~-550nA/ppm

3.   High resolution:0.1ppm

4.   T90 response time:

5.   Working environment:-30~50 ℃,10 ~ 90% RH