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Dissolved oxygen controller

Polarography dissolved oxygen meter

1.Membrane (polarography) / Fluorescence
2.Fish farm/pond
3.multiple electrode available

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Our Successful Customer Case 1-Scrubber Tower;  2-Hydroponic planting/fertilizer system;   3-Hydroponics System;   4-Cleaning in place (CIP);   5-industrial wastewater;                 (Continuous update......Click more )


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Dissolved Oxygen Meter is one of the intelligent online chemical analysis instruments. It is widely used in continuous monitoring of dissolved oxygen, saturation, oxygen partial pressure and temperature .The continuous monitoring data is realized by remote transmission monitoring and recording through the transmission output connection recorder. It can also be connected to the RS485 interface and can be easily connected to the computer for monitoring and recording through the MODBUS-RTU protocol.



 It is widely used in continuous monitoring of dissolved oxygen, saturation, oxygen partial pressure and temperature in thermal power, chemical fertilizer, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water solutions.

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Detail Show

Dissolved Oxygen Meter: Controller+Electrode----We have two models of dissolved oxygen meter, mainly GWQ-DO280 membrane dissolved oxygen meter and GWQ-DO290 Fluorescence dissolved oxygen meter.


Membrane method: (electrochemical method) Under the action of pressure, dissolved oxygen passes through the separator and redox occurs. In response, the oxygen concentration was measured by measuring the resulting diffusion current.


Fluorescence method: blue light is irradiated on the fluorescent substance to excite the fluorescent substance and emit red Light,because oxygen molecules can take away energy (quenching effect), so the The time and intensity of red light is inversely proportional to the concentration of oxygen molecules. Excitation by measurement The phase difference between the red light and the reference light is compared with the internal calibration value, so that it can be calculated, Calculate the concentration of oxygen.

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Measuring principleMembrane (polarography)

Fluorescence method

Supporting electrodeGEC-DO2801

GEC-DO2901(for fresh water)

GEC-DO2902(for sea water)

Measuring range

Oxygen content:0~20mg/L 


Oxygen partial pressure:0~400hPa

Oxygen content:0~20mg/L 





Oxygen content:0.01mg/L 


Oxygen partial pressure:1hPa

Oxygen content:0.01mg/L 


Temperature range-10~+60℃0~45℃
 Correction accuracy (temp.)±0.5℃
Temp. measurement typeManual/Auto(NTC10K / PT1000)
Power supplyAC220V±10%,50Hz/60Hz
Relay alarm250VAC/3A
CommunicationRS485(compatible with MODBUS RTU)
Transmitting functionIsolated transmission 4-20mA output, maximum loop 750Ω, 0.1% FS
Opening size