Aanderaa dissolved oxygen sensor 4835

Features:

· Principle of Optical Fluorescence Quenching Measurement Based on Life Cycle

· long-term stability

· No calibration required for over a year

· Low maintenance volume

· User friendly interface

· Used for Andra's data acquisition system and Ocean Guardian system

· Can automatically detect and identify

· Can be used separately

· 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:

· Minor disturbance impact (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