The online fluorescence method dissolved oxygen analyzer is a high-precision water quality monitoring solution based on the principle of fluorescence quenching. It is a water quality monitoring device based on the principle of fluorescence quenching, mainly used for real-time detection of dissolved oxygen concentration in water bodies. Fluorescence dissolved oxygen analyzer is mainly used for water environment monitoring, sewage treatment, and scientific research fields. The sensor uses platinum metalloporphyrin composite polyester foil as the fluorescent substance, and calculates the oxygen concentration by detecting the phase difference between the excitation red light and the reference light. It supports temperature compensation algorithm and resistance to hydrogen sulfide and chloride ion interference.
The core technology of the online fluorescence dissolved oxygen analyzer is based on the principle of fluorescence quenching, and its detection process is as follows:
Fluorescence excitation:
The fluorescent substance at the front end of the sensor (such as platinum metalloporphyrin composite polyester foil) is excited under blue light (470nm) and emits red light (600-650nm). Oxygen molecules shorten the duration and intensity of red light through energy transfer, forming a quenching effect.
Phase difference calculation:
The instrument has a built-in synchronous red light source as a reference to measure the phase difference between the excited red light and the reference light. The phase difference is inversely proportional to the concentration of oxygen molecules. Through internal calibration curves and temperature compensation algorithms, the dissolved oxygen concentration value (unit: mg/L or% saturation) is output.
Anti interference design:
Fluorescent substance is coated under the polyester foil, with a black light blocking material covering the surface to avoid interference from sunlight and other fluorescent substances; Sapphire light window isolates water samples from optical components to ensure long-term stability.
Fast response and anti-interference
Quick response: T90 ≤ 50 seconds, capable of capturing the dynamic changes of sudden rise and fall of dissolved oxygen.
Anti interference: not affected by complex environmental factors such as flow rate, temperature fluctuations, algae, and residual bait, ensuring data stability.
Maintenance free and applicable to multiple scenarios
Maintenance free: No need to replace the diaphragm and electrolyte, the sensor has a lifespan of up to 2 years.
Multi scenario applicability: Suitable for freshwater fisheries, industrial wastewater treatment, marine research and other fields, supporting automatic temperature and pressure compensation and salt content correction.