Summary:
Fish and shellfish need oxygen to live, grow and reproduce. If fish die or do not grow large enough to reproduce, low dissolved oxygen levels can lead to fish farming failures. Dissolved oxygen sensor can be used to measure dissolved oxygen levels in the water.
Why does dissolved oxygen fluctuate?
Several factors affect the amount of dissolved oxygen available to fish or shellfish. First, it is important to consider fish populations compared to the size of their habitats. Aquaculture usually involves raising large numbers of fish in small amounts of water. This man-made overpopulation leads to rapid depletion of resources, including dissolved oxygen. Therefore, the fish farming industry uses mechanical aeration and other methods to supplement natural oxygen.
Microbial populations also influence dissolved oxygen levels. Some microorganisms, such as phytoplankton, can photosynthesize. During photosynthesis, sunlight and carbon dioxide are converted into oxygen and organic matter. This process increases dissolved oxygen in the water. Phytoplankton and other microorganisms also perform respiration, which consumes oxygen and consumes food. Changing microbial populations will change the availability of oxygen depending on the biochemical processes they perform.
Monitoring dissolved oxygen:
Monitoring dissolved oxygen using dissolved oxygen sensor in aquaculture applications has many benefits. Monitoring allows managers to be notified when dissolved oxygen drops too low, thereby endangering the health of fish or shellfish. The monitoring also provides feedback to the control system that automatically regulates oxygen in aquaculture through mechanical aeration. Careful control of inflatable systems is crucial because they require a lot of energy consumption. Optimizing aeration for sustainable growth conditions can save energy and money.
The solubility of oxygen in water depends on temperature, pressure and the salt dissolved in the water. Dissolved oxygen analyzer sensor is composed of gold electrode (cathode) and silver electrode (anode) and potassium chloride or potassium hydroxide electrolyte, oxygen diffusion through the film into the electrolyte and gold electrode and silver electrode form a measurement loop.
When 0.6 ~ 0.8V polarization voltage is added to the electrode of the dissolved oxygen analyzer, oxygen diffuses through the membrane, the cathode releases electrons, the anode receives electrons, and generates current. The whole reaction process is as follows: Anode Ag+Cl→AgCl+ 2E – cathode O2+2H2O+ 4E →4OH- According to Faraday’s Law: The current flowing through the electrode of the dissolved oxygen analyzer is proportional to the partial pressure of oxygen, and there is a linear relationship between the current and oxygen concentration under the condition of constant temperature.
JXCT dissolved oxygen sensor:
The dissolved oxygen sensor is an intelligent electrode using RS485 interface and Modbus/RTU protocol, built-in temperature sensor and compensation algorithm, stable performance, accurate detection. The casing is made of rugged ABS material and is designed for protection in volatile and unusual environments such as sewage treatment plants or chemical effluent discharges. It has the advantages of fast response, high measurement accuracy, good stability and small drift, and its performance is in the leading level in China.