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Dissolved Oxygen (DO) is really a physical distribution of oxygen molecules in water. There are two main sources of DO in water: atmosphere and photosynthesis. Waves and tumbling water mix air into water where oxygen readily dissolves until saturation occurs. Oxygen is also produced by aquatic plants and algae as a by-product of photosynthesis.

The electrochemical method of measuring DO requires a cathode, anode, electrolyte solution and a gas permeable membrane. The material of the membrane is specially selected to permit oxygen to pass through. Oxygen is consumed by the cathode which will create a partial pressure across the membrane. Oxygen will then diffuses into the electrolyte solution.

Thus, a DO meter actually measures the pressure of oxygen in water. It can be used to measure DO in any medium.

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βˆ™ 13y ago
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βˆ™ 5mo ago

Dissolved oxygen meters typically work by using a sensor that measures the amount of oxygen dissolved in a liquid sample. This is usually done using a probe containing an oxygen-permeable membrane that allows oxygen to diffuse into the sensor. The sensor then generates a signal that is correlated with the oxygen concentration in the sample, which is displayed as a numerical value on the meter.

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Q: What is the Working principle of dissolved oxygen meter?
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