Target: Liquid
Model: MW-O201
Detection range: 0~20 mg/L
Detection principle: It is polarographic type dissolved oxygen water quality detection sensor.
Characteristics: Quick response, good stability, high precision, long life and easy maintenance.
Resolution and accuracy: Minimum graduation value 0.01 mg/L
Sensitivity 4.5-5.5 nA/(mg/L)(O2
Response time: <30 s

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MW-O201 sensor is polarographic type dissolved oxygen water quality detection sensor. At a certain polarization potential, the dissolved oxygen in the water will pass through the oxygen permeable membrane and REDOX reaction will occur on the surface of the working electrode. The resulting current is proportional to the concentration of dissolved oxygen in the water, and the concentration of dissolved oxygen in the water is calculated by measuring the size of the current.


It is widely used in the detection of dissolved oxygen water quality in laboratory research, aquaculture, environmental protection and other fields.


Quick response, good stability, high precision, long life and easy maintenance.


Measure range 0~20 mg/L
Temperature range 5~45℃
Minimum graduation value 0.01 mg/L
Response time (T90) <30 s
Temperature compensation without
Zero point output (oxygen-free water) <1nA (2% Na2SO3, 20℃)
Pure water saturated oxygen output 40nA -48nAin saturated water at 20℃ 
Measurement error ≤ ±0.1 mg/L
Zero error ≤0.1 mg/L
Repeatability ≤ ±0.10 mg/L
stability ±0.03 mg/L
Sensitivity 4.5-5.5nA/mg/L(O2)
Interface 2 connection wires

* 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.