A commonly used sensor for water quality detection - dissolved oxygen sensor
Dissolved oxygen is the amount of oxygen dissolved in a given amount of water at a given temperature and atmospheric pressure. Therefore, it should not be confused with oxygen in water molecules. It is usually expressed as one millionth of concentration or milligrams per liter. It can also be expressed as percentage saturation, where saturation is the theoretical maximum amount of oxygen that can be dissolved in water at a given height and temperature.
Dissolved oxygen sensor is a new type of integrated sensor that can obtain the numerical value of dissolved oxygen in the environment where the device is located through the collection device. It can be widely used in environmental monitoring, aquaculture, sewage treatment, industrial production and other environments. Compared with traditional IoT sensors, it has the advantages of high accuracy and easy installation. At present, the main methods for measuring dissolved oxygen content in water environments include colorimetric method, iodometric method, conductivity method, electrode method, etc. The electrode method, also known as the sensor method, has gradually been widely used in recent years due to its ease of online monitoring and high detection sensitivity.
With the acceleration of the construction of the Internet of Things, the intelligence of aquaculture has also become a development trend for future large-scale aquaculture. Using IoT sensors to guide and improve aquaculture measures in a timely manner can increase the revenue of aquaculture.
The significance of testing the five conventional parameters of water quality:
PH: Changes in pH value in surface water quality can affect the oxygen uptake capacity of algae and the sensitivity of animals to food intake;
Conductivity: mainly used to measure the conductivity of water and monitor the total ion concentration in the water. It contains a total amount of various conductive substances such as chemicals, heavy metals, impurities, etc.
Dissolved oxygen: In addition to being consumed by reducing substances such as sulfides, nitrite, and ferrous ions in surface water, dissolved oxygen is also consumed by the respiration of microorganisms in water and the oxidative decomposition of organic matter in water by aerobic microorganisms. Dissolved oxygen is an important indicator for surface water monitoring and a representation of whether a water body has the ability to self purify.
Turbidity: The high or low turbidity value intuitively reflects the degree of turbidity in the water body. The degree of turbidity is mainly caused by insoluble substances in water, including suspended sediment, corrosive substances, planktonic algae, and colloidal particles. Reducing turbidity also reduces bacteria, Escherichia coli, viruses, Cryptosporidium, iron, manganese, etc. in the water.
Temperature: Changes in surface water temperature can have significant negative impacts on aquatic wildlife, affecting the growth of organisms, the speed of feeding for fish and shrimp, as well as their reproductive time and efficiency.
