Dissolved Oxygen

Dissolved Oxygen Measurement

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The measurement of dissolved oxygen has it biggest importance in environmental analysis, but also in some industrial applications.

In its simplest form a dissolved oxygen sensor contains a working electrode and a counter-electrode. Both electrodes are located in an electrolyte system which is separated from the sample by a gas-permeable membrane. The working electrode reduces the oxygen molecules to hydroxide ions. In this electrochemical reaction a current flows from the counter-electrode to the working electrode. The more oxygen is present in the sample, the larger the current signal. From this signal the D.O. meter calculates the concentration of dissolved oxygen in the sample.

The optical method uses the so-called fluorescence quenching. The membrane contains a special dye which is excited by light. The fluorescing light will be changed in its intensity and phase by oxygen. This signal change can be detected and evaluated. It is the principle of modern optical D.O. sensors which also digitally process the signal and send it to the meter.

 

• inoLab® Laboratory Dissolved Oxygen Meters

• Portable Dissolved Oxygen Meters

• Galvanic Dissolved Oxygen Sensors

• Digital IDS Dissolved Oxygen Sensors

• Accessories

Sensors for lab and field

Sensors for lab and field

To measure oxygen in lab and field 

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Benchtop meters

Benchtop meters

To measure oxygen in lab – radio connection available 

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Portable meters

Portable meters

To measure oxygen in the field – radio connection available 

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photoLab<sup>?</sup> 7100 VIS

photoLab® 7100 VIS

Spectral photometer to measure oxygen in the lab 

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Optical sensors for wastewater

Optical sensors for wastewater

To monitor e.g. nitrification on a wastewater treatment plant – calibration free 

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Electrochemical sensors for wastewater

Electrochemical sensors for wastewater

To monitor e.g. nitrification on a wastewater treatment plant 

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Oxygen in drinking water

Oxygen in drinking water

Analog systems for drinking water monitoring 

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Titrator TitroLine<sup>?</sup> 7000

Titrator TitroLine® 7000

To titrate oxygen according to WINKLER 

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