Polymetron 9582 dissolved oxygen analyzer

- typical application

 

Power plants, semiconductor plants, etc., are suitable for the analysis of dissolved oxygen at low concentration (ppb) such as deaerated water.

 

-Features and benefits

 

The pre-installed membrane module only needs a few seconds to replace the membrane

 

Low detection limit

 

Quick calibration process: calibration from ppm (air) to ppb (process) can be completed in less than 15 minutes

 

The universal 9500 controller is used for easy integration and simple installation.

 

 

 

- working principle

 

The measurement of dissolved oxygen is based on the well-known Clark battery principle. The oxygen-permeable membrane isolates the water sample from the electrode, so there is no need to adjust the sample. Since other reducing or oxidizing ions cannot pass through the gas-permeable membrane, they will not cause interference.

 

A constant voltage is applied to the two electrodes to keep the potential of each electrode constant. The gold working electrode (cathode) reduces dissolved oxygen to hydroxide ions:

 

O2 + 2H2O + 4e--> 4OH

 

The oxidation reaction takes place on the surface of the large silver electrode (anode):

 

4Ag + + 4Br--> 4AgBr + 4e-

 

The oxidation-reduction reaction produces a diffusion current, which is proportional to the dissolved oxygen concentration.