Electrochemical H2S Sensor 4S-H2S

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4S-H2S sensor is a constant potential electrolytic H2S sensor. H2S 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 H2S concentration. The H2S concentration can be determined by testing the current. 4S-H2S is widely used for the detection of hydrogen sulfide in industrial, mining and environmental protection.


* 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.


Coal Mining Industry Poison Gas Monitoring

Flammable gas is mainly detected by catalytic sensor, mainly measuring 100% LEL, and also using thermal conductivity components to measure 100% VOL. High-end gas detection products in the petrochemical industry are gradually using infrared gas sensors, which can measure 100% LEL and 100% VOL. At the same time, laser beam technology is also gradually being used in the petrochemical industry.


Industrial Poison Alarm

Common toxic and harmful gases can be divided into irritating gases and asphyxiating gases according to their toxic properties.


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Specification Product Size

Technical Data Sheet

Basic performance
Sensitivity 700±150nA/ppm
Range 0~100ppm
Baseline drift <±2ppm
Response time (T90) <20s(Typical value 15s)
Recovery time (T10) <20s(Typical value 15s)
Linearity Linear
Repeatability <±2%
Use environment
range of working temperature -40℃~+55℃
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 0.2mA
Maximum O/C voltage 1.3V
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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Here you can learn about the selection guide, common technical problems, packaging, transportation, MOQ, delivery time, etc.

What is the Service Life of Mq Series Sensors?

Usually, the life span is about ten years, and the actual application is related to the use environment and method of use.

Why Does the Sensitivity of the Semiconductor Sensor Reduce During Use?

There are five main reasons: 1) Organosilicon, sulfide, phosphide, chlorine (fluorine) compound, alkali metal, etc. will poison the sensor; 2) The power supply voltage of the sensor has changed; 3) The sensor has been used for too long (Exceeded service life); 4) The test gas concentration is too high; 5) The sensor is subjected to severe vibration or destructive external conditions.

Can the Catalytic Sensor Be Made into a Digital Display?

MC series catalytic products have good linearity and can be made into digital display products.

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