Target: SO2
Model: ME4-SO2
Detection range: 0-20ppm, Max 200ppm
Detection principle: Electrochemical
Characteristics: Detection of sulfur dioxide in industrial and environmental protection fields
Size: φ32×14.5
Working conditions: Resolution ratio 0.1ppm
Response time≤30s
Anticipated using life 2 years

ME4-SO2 Manual download
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ME4-SO2 sulfur dioxide gas sensor is constant potential electrolysis type. Oxidation-reduction reaction with sulfur dioxide and oxygen take place respectively on the working electrode and on the counter electrode. The process releases electric charge and generates current. The current is in direct proportion to the concentration of sulfur dioxide. So the concentration of the target gas could be got by measuring the value of current.


It is used for hydrogen sulfide detection in industrial occasions and environmental protection field.


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


Detection gas Sulfur dioxide (SO2)
Detection range 0~20ppm
Max range 200ppm
Sensitivity (0.8±0.2) µA/ppm
Resolution 0.1ppm
Response time (T90) ≤30S
Bias voltage 0mV
Load resistance 10Ω (recommended)
Repeatability <2% Output value
Stability (/month) <2% 
Output linearity Linear
Zero drift (-20℃~40℃) ≤0.2ppm
Temperature range -20℃~50℃
Humidity range 15%~90% RH
Pressure range standard atmospheric pressure±10%
Life span 2 years (in air)

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.