Aanderaa dissolved oxygen sensor 4330

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·Principle of Optical Fluorescence Quenching Measurement Based on Life Cycle

·Long term stability

·No calibration required for over a year

·Low maintenance volume

·Friendly user interface

·Used for the Andra Ocean Guardian platform

·Automatic detection and recognition

·Can be used independently

·Output format: CANbus AiCaP RS232

Dissolved oxygen is an important measurement parameter in the biochemical processes of aquatic environments and is often used as a tracer in marine research. For hypoxic environments, monitoring dissolved oxygen is crucial, such as:

·Shallow water areas with algal blooms near the coast

·Fjords or other areas with less water exchange

·Aquaculture

·Areas where mining or dredging waste is dumped

The Andra dissolved oxygen probe is based on the fluorescence quenching measurement principle of the lifecycle. It uses platinum porphyrin complex as the fluorescent material, embedded in a breathable fluorescent film, and a black light isolation coating protects the fluorescent material from the influence of sunlight and particle fluorescence in water. One side of the fluorescent film is exposed to the environmental water, and the other side is installed on the optical window of the measurement room. By exciting the fluorescent material on the fluorescent film with blue light, it emits red light. The detector detects the time from the emission of blue light to the release of red light, which is linearly correlated with the dissolved oxygen concentration. After temperature compensation, the dissolved oxygen concentration is obtained. The fluorescence quenching measurement principle based on the lifecycle has the following advantages compared to electrochemical sensors:

·The impact of disturbance is relatively small (does not consume oxygen)

·Less affected by pollution

·Measuring the absolute concentration of dissolved oxygen does not require frequent calibration

·Better long-term stability

·Less affected by pressure

·The impact of pressure is predictable

·Faster response time

>Precautions for induction film

The standard fluorescent film has an isolation layer to prevent direct sunlight from affecting it, while the fast response fluorescent film does not have this protective coating. When the external light intensity exceeds 15000lux, reading errors may occur. To prevent damage from ambient light to the rapid response film, it is recommended to use a standard film without the need for quick readings.

Aanderaa dissolved oxygen sensor 4330