Aanderaa 4531 oxygen optode
|Within Vocab||SeaVoX Device Catalogue|
|Alternative Labels||AA optode 4531|
|Definition||A dissolved oxygen sensor which provides analogue and digital output to third party data loggers. Measurement based on the ability of selected substances to act as dynamic fluorescence quenchers. The fluorescent indicator is a special platinum porphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water. A black optical isolation coating protects the complex from sunlight and fluorescent particles in the water. This sensing foil is attached to a window providing optical access for the measuring system from inside a watertight titanium housing.The foil is excited by modulated blue light, and the phase of a returned red light is measured. By linearizing and temperature compensating, with an incorporated temperature sensor, the absolute O2 concentration can be determined.|
|Has Current Version||1|
||dissolved gas sensors||Mapping: 805185|
||Aanderaa Data Instruments AS||Mapping: 1449153|
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