What factors can affect the measurement results of a dissolved oxygen sensor?

The main factors affecting dissolved oxygen (DO) measurement results include:

Water Sample Temperature:

Temperature is a crucial factor affecting DO measurement results. The solubility of dissolved oxygen decreases with increasing temperature. Therefore, changes in water sample temperature directly lead to changes in dissolved oxygen concentration.

Salinity:

Salinity is also a key factor affecting DO measurement results. As salinity increases, the density and viscosity of water change, thus affecting the diffusion rate and solubility of dissolved oxygen.

Pressure:

The pressure exerted on the water sample also affects the DO measurement results. In deep-water environments, water pressure gradually increases with depth, and the dissolved oxygen concentration changes accordingly.

Instrument Calibration and Maintenance:

In addition to the factors inherent to the water sample itself, the calibration and maintenance of the dissolved oxygen meter also significantly impact the measurement results. Regular calibration ensures the accuracy and reliability of the instrument; proper maintenance extends the instrument's lifespan and reduces the likelihood of malfunctions.

Sample Flow Rate: 

Oxygen diffuses through the membrane more slowly than through the sample; therefore, it is essential to ensure sufficient contact between the electrode membrane and the solution. For flow-through detection methods, oxygen in the solution diffuses into the flow cell, causing oxygen loss in the solution near the membrane, resulting in diffusion interference and affecting the measurement.

Light: 

For some optically based DO (dissolved oxygen) meters, lighting conditions can also affect the measurement. Excessive light exposure, especially direct sunlight, may interfere with the normal operation of the fluorescence sensing element, leading to erroneous readings.

Chemical Substances: 

Chemical substances present in water, such as sulfides, nitrites, and chlorides, can sometimes interfere with dissolved oxygen sensors, especially those based on electrochemical principles. They may undergo side reactions with the electrodes, resulting in false current signals and thus affecting the accuracy of the measurement results.

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