Electrochemical SO2 Sensor 4S-SO2

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The 4S-SO2 sensor is a constant potential electrolytic gas sensor. SO2 gas and O2 undergo corresponding redox reactions at the working electrode and the counter electrode and release charges to form a current. The current is proportional to the gas concentration. The gas concentration can be determined by testing the current.


* Low power consumption
* High precision and sensitivity
* Wide linear range
* Strong anti-interference ability
* Excellent repeatability and stability

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Industrial Exhaust Monitoring

Industrial waste gas refers to the general term for various pollutant-containing gases discharged into the air generated during the fuel combustion and production process in the factory area of the enterprise. These gases enter the human body through the respiratory tract through different routes, some directly cause harm, and some have an accumulation effect, which will seriously endanger human health.


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Specification Product Size

Technical Data Sheet


Basic performance
Sensitivity 425±125nA/ppm
Maximum filter volume >1000hours*25ppm
Range 0~20ppm
Baseline drift <±0.5ppm
Response time (T90) <30s
Maximum load 100ppm
Linearity Linear to 20ppm
Repeatability <±2%
Use environment
range of working temperature -30℃~+50℃
Working pressure range 800~1200mbar
Operating humidity range 15%RH~90%RH
Life warranty
Output drift <15% Per year
Service life >24months(in air)
Warranty 12months(From the date of shipment)
Recommended storage temperature 0~20℃(sealed container)
Resolution <0.1ppm
Recommended load resistance 10Ω
Intrinsic safety characteristics
2000ppm maximum current 0.1mA
Maximum O/C voltage 0.75V
Maximum S/C current <1.0A





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As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:


As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:


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We have 17 sensor series, 200+ categories, and 300+ detection objects for gas detection. Such as CO, CO2, VOC, PM2.5, CH4, LPG and so on. In particular, we also have MEMS sensors. According to your industry application, gas principle, power consumption, accuracy, and range requirements, and we can select a specific model for you. You can also use the product filter below to choose a suitable product, or choose online serivce.

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Winsen is a factory with over 30,000 square meters area and 500+ production machines which is focusing on sensors development&manufacturing. It has strong R&D strength with more than 100 R&D personnel.

How long is the delivery time?

1-7 days after received payment

What is your warranty term?

The warranty period is one year from the date of shipment. If the appearance of the product is not damaged, it can be returned after confirmation. For damage not caused by Winsen, the customer shall bear all maintenance costs.

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