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What is dissolved oxygen and how to choose a right meter?

2022-12-13
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What is dissolved oxygen?
1. Molecular oxygen dissolved in water is called dissolved oxygen, usually recorded as DO, expressed in milligrams of oxygen per liter of water. Dissolved oxygen is an indicator of water body sensory and protection of the survival of aquatic organisms. Higher dissolved oxygen reflects the higher health of the aquatic ecosystem.

2. Dissolved oxygen content is commonly expressed in two forms, namely dissolved oxygen concentration and dissolved oxygen saturation.
Dissolved oxygen concentration:
Refers to the concentration of molecular oxygen dissolved in water under certain conditions.
Dissolved oxygen saturation:
Taking into account the influence of temperature and altitude factors, it is expressed as the percentage of the measured dissolved oxygen concentration to the saturated dissolved oxygen concentration at that temperature.
Different industries and different samples have different meanings and dissolved oxygen or dissolved oxygen saturation needs to be measured according to the actual situation.




Key points for selecting a dissolved oxygen meter.
1. Determine the measurement parameters: dissolved oxygen, dissolved oxygen saturation, and temperature.

2. Temperature compensation function: manual temperature compensation, automatic temperature compensation.

3. Air pressure compensation function: manual air pressure compensation, automatic air pressure compensation.

4. Determine the measuring range: (0.00-20.00) mg/L, (0.00-50.00) mg/L, (0.00-99.99) mg/L.
Healthy water body: At normal temperature and pressure, the dissolved oxygen content in water is generally 6-10mg/L.
Hypoxia: A large amount of organic pollutants and nutrients are discharged into lakes and reservoirs through rivers or coastal point sources, resulting in deterioration of water quality and hypoxia in water bodies.
Oxygen enrichment: The use of aeration or pressurized dissolved oxygen causes the concentration of dissolved oxygen in the water to increase. Common ones include aeration tanks and oxygen-enriched drinks.

5. Dissolved oxygen indication error: ±0.30mg/L (≤20.00mg/L), ±10.0% (>20.00mg/L)

6. Application scenario: According to the application scenario, it is divided into a laboratory dissolved oxygen meter for sampling laboratory measurement, a portable dissolved oxygen meter for on-site measurement, and an industrial dissolved oxygen meter for online automatic continuous measurement.

7. Reading mode: automatic reading, scheduled reading, scheduled interval reading.

8. Data management function: Whether it is necessary to store data and print data.

9. Communication interface: whether communication is required. Common communication interfaces are the RS-232 interface and the USB interface.

10. External devices: computer, printer, USB flash drive, scanner gun, automatic sampler, etc.

11. Other functions: user rights management and GMP management, etc.


Aoda Instrument's dissolved oxygen meter series products include laboratory measurement solutions, on-site portable measurement solutions, and online measurement solutions according to different usage scenarios.


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If you have a question about Dissolved oxygen meter and laboratory instrument, contact us to find out how Aoda can help.
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