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Oxygen Concentration

66 Series Portable Instruments

Measured value of oxygen concentration is available immediately after the instrument is on...

77 Series Desktop Instruments

Measurement of oxygen concentration is possible even in still water, it is possible to make pinpoint measurement and to draw a distribution...

MFD 79 (only Oxygen Meter)

The pocket multi-parameter instrument MFD 79

MKT 44A Pocket Oxygen Meter

The MKT 44A is a pocket battery meter for comfortable, reliable and accurate measurement of oxygen concentration and temperature in both clean and dirty, running and stagnant water...

Dissolved oxygen concentration is one of the main indicators of water quality. It is an important indicator of surface water pollution and a significant parameter that crucially determinates the effectiveness of the activation, nitrification and denitrification process in biological water treatment plants. This is an essential parameter in fish breeding. In the food industry oxygen influences fermentation process and food storage.
For measuring oxygen concentration in water amperometric membrane sensors (Clark type sensors) are used mostly.
The sensor is made up of polarizing electrodes - a platinum cathode and non-polarizing argent chloride anode. Both electrodes are submerged in electrolyte and separated from the measured medium by a homogeneous separating membrane, which is oxygen permeable, (also permeable to other gases - H2S, SO2, CO2, and Cl2).
The membrane is non-permeable for ions, and most absorptive pollutants in solutions usually present, which, in the absence of a membrane, would interfere with or disturb oxygen reduction.
By the application of a suitable voltage between the electrodes oxygen reduction occurs on the cathode surface. The result of this reaction is an electric current between the sensor electrodes, which is proportional to the partial pressure of oxygen in measured solution.
Oxygen sensors (when active) consume oxygen, which is removed from the measured medium. Therefore all factors which influence the speed of diffusion toward the cathode surface are applied during measurement (for example pollution layer on the membrane surface). As CSOT 43 oxygen sensors have extremely low oxygen consumption, disturbing factors caused by membrane pollution are extremely low also.

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