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Concept

Aanderaa 4831F oxygen optode

URI http://vocab.nerc.ac.uk/collection/L22/current/TOOL1240/2/
Within Vocab SeaVoX Device Catalogue
Alternative Labels AA optode 4831F
Definition A dissolved oxygen sensor which provides analogue (0-5V) and digital output (RS-232) to third party data loggers, gliders and floats. 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. This sub-model is not equipped with a black optical isolation coating that 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 housing. The foil is excited by modulated blue light, and the phase of a returned red light is measured. For improved stability the 4831 optode also performs a reference phase reading by use of a red LED that does not produce fluorescence in the foil. This sub-model is fitted with a fast response (transparent) sensing foil (response time <8 secs). By linearizing and temperature compensating, with an incorporated temperature sensor, the absolute O2 concentration can be determined. Accuracy +/- 1.5% or 2uM; precision +/- 0.2 uM.
Date 2018-05-30T13:36:38
Identifier SDN:L22::TOOL1240
Note accepted
Is Version Of TOOL1240
Previous Version 1
version 2
Broader L05:351 dissolved gas sensors
L19:SDNKG17 sensor_model
Related L35:MAN0007 Aanderaa
B75:ORG00228 Aanderaa Data Instruments AS

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