Optical Dissolved Oxygen Sensor DOS Series

 Optical Dissolved Oxygen Sensor DOS Series
  • DOS-20[Checker][Parts No. 05160]

Easy Installation, Simple Operation. Maintenance long-term unnecessary.


  • Combination use with MLSS Analyzer for biological treatment or MBR process
  • Robust Design -Inert ABS construction
  • Long Term Stability -No Influence by water flow rate


Aquaculture ground
Aquaculture ground


Replacement sensor cap: DOS-CP

Replacement sensor cap: DOS-CP

[Parts No. 05161]

It is a consumable item that we will exchange for 1 year as a guide.

Please go to the support page to get the necessary files in PDF.

  • Specifications

  • Dimensions

Model DOS-20
Measurement item Dissolved Oxygen concentration (mg/L)
Temperature (°C)
Dissolved oxygen saturation (%)
Oxygen Partial Pressure (kPa)
Measurement range(Display resolution) Dissolved oxygen concentration: 0.00 – 50.00 mg/L (0.01 mg/L)
Temperature: 0.0 – 50.0°C (0.1°C)
Dissolved oxygen % saturation: 0.0 – 200.0 (0.1%)
Oxygen partial pressure: 0.0 – 150.0 kPa (0.1 kPa)  
Measurement resolution ± 0.1 mg/L (0 – 8 mg/L)
± 0.2 mg/L (8 – 20 mg/L)
± 10% of reading (20 – 50 mg/L)  
Response time 90% response: < 45 seconds
95% response: < 60 seconds (Water temperature: 25°C)
Power supply voltage 12 to 36 VDC
Current consumption 25 mA max. (24 VDC)
Communications (function) MODBUS (RTU/ASCII)
Operating temperature 0 to 50°C (unfrozen)
Major material ABS
Dimensions Φ44 × 204 mm
Weight Approx. 850 g (including cable length of 10 m)
Degree of protection IP68, maximum depth of 200 meters (underwater type)
Sensor cable length 10 m
Sensor cap replacement cycle Every year after sensor installation (guideline)
Sensor cap storage period 2 years after manufactured date (when stored in the specified container)
Storage temperature: 1 to 60°C
*Specifications are subject to change without prior notice.
dimensions of Optical Dissolved Oxygen Sensor DOS-20

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