The principle of fluorescence quenching provides a technological breakthrough for maintenance free and high-precision measurement of dissolved oxygen analyzers. Its core lies in utilizing the energy transfer effect of oxygen molecules on fluorescent substances to infer dissolved oxygen concentration by measuring changes in fluorescence signals.
Maintenance free implementation mechanism: Traditional electrochemical methods require regular replacement of membranes and electrolytes, while fluorescence based dissolved oxygen analyzers adopt a membraneless design, with fluorescent substances (such as platinum/ruthenium metalloporphyrin composite polyester foil) coated under the polyester foil and covered with a black light blocking layer on the surface to avoid interference from sunlight and other fluorescent substances in water. This structure does not require the consumption of oxygen or electrolyte, fundamentally eliminating the need for consumable replacement in traditional methods. At the same time, the sensor adopts a titanium alloy shell and sapphire light window, with IP67/IP68 level protection, which can withstand complex water quality (such as water containing sulfides and chloride ions) for a long time without corrosion, further extending its service life.
High precision technical guarantee: Fluorescence method calculates oxygen concentration by measuring the phase difference between excited red light and reference light, which is inversely proportional to the concentration of oxygen molecules. This technology has a resolution of 0.01ppm, an accuracy of ± 0.1mg/L, a repeatability error of ≤ 0.2ppm, and can complete concentration detection within 60 seconds. To cope with environmental interference, the instrument is equipped with automatic temperature compensation (0-40 ℃), pressure compensation, and salt content correction modules to ensure measurement stability in scenarios such as seawater and high salt wastewater. In addition, the energy transfer process between fluorescent substances and oxygen molecules is not affected by flow rate, and does not require stirring or additional calibration, further improving data reliability.
Expansion of application scenarios: Based on the above advantages, fluorescence based dissolved oxygen analyzers have been widely used in fields such as sewage treatment aeration tanks, aquaculture, and ecological monitoring of rivers and lakes. For example, in sewage treatment, it can monitor dissolved oxygen concentration in real time and optimize energy consumption by linking aeration equipment; In aquaculture, the threshold alarm function can prevent fish and shrimp from dying due to hypoxia, significantly improving aquaculture efficiency.