Electrochemical Oxygen Sensor 4S-O2

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The electrochemical 4S-O2 oxygen sensor is based on the principle of electrochemistry, using the measured gas to undergo a corresponding redox reaction on the working electrode and the counter electrode of the sensor and release the charge, and form a current through the external circuit. The magnitude of the current is proportional to the gas concentration, thereby Realize quantitative measurement of target gas.


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Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.


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Specification Product Size

Technical Data Sheet


Performance Output Output (µA) in 20.9%O2 80-120
Response time t90 time (s) from 20.9% to 0% O2 < 15
Zero point current Output in N2 (µA) < 2.5
Linearity Oxygen deviation percentage at 10%O2 0.6
Lifespan Output drift 3 month output percentage change < 1
life span Number of months for output to drop to 85% of original output at 20.9% O2 > 24
Environment Humidity sensitivity Percent oxygen change: 0~95%RH, 40°C < 0.7
CO2 sensitivity Percent change in oxygen reading/CO2 concentration at 5% CO2 0.1
Pressure sensitivity At 20kPa, output change percentage/pressure change percentage < 0.1
Key parameter Temperature range -30~55
Pressure range kPa 80~120
Humidity range Percentage of continuous relative humidity (0~99%RH in the short term) 5~95
Storage period Storage months at 3~20℃ 6
Load Resistance Ω (recommended) 47~100
Diameter mm (with label) 20
Height mm (with foam gasket) 17.4
Weight g < 16



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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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