Dissolved oxygen analyzer is an instrument used to measure the oxygen content in water based on the principle of electrochemistry, which involves the occurrence of redox reactions on two different metal electrodes in an oxygen-containing electrolyte solution. The resulting diffusion current is related to the oxygen concentration in the solution. Some instruments also use the principle of polarography in voltammetry, which applies voltage to the working electrode in a solution and generates a polarographic graph showing a certain relationship between the current and the concentration of the substance being measured in the solution.

Characteristics of dissolved oxygen analyzer

Dissolved oxygen meter measures the amount of oxygen dissolved in an aqueous solution. Oxygen dissolves in water through the surrounding air, air flow, and photosynthesis. Dissolved oxygen is consumed in water through respiration and decomposition, mainly supplemented by air and photosynthesis. The oxygen content in water mainly depends on temperature. The oxygen concentration in warm water should be lower than that in cold water. However, excessive dissolved oxygen content can be harmful to animals and plants.