@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . sssom:subject_id . sssom:subject_id . skos:related . skos:narrower . sssom:subject_id . skos:member . skos:related . skos:narrower . sssom:subject_id . skos:narrower . sssom:object_id . skos:narrower . sssom:object_id . dc:isVersionOf . sssom:object_id . dc:isVersionOf . skos:related . rdf:type skos:Concept ; dce:identifier "SDN:L22::TOOL1239" ; dc:date "2022-04-27 16:55:15.0" ; dc:identifier "SDN:L22::TOOL1239" ; pav:authoredOn "2022-04-27 16:55:15.0" ; pav:hasCurrentVersion ; pav:hasVersion ; pav:version "2" ; void:inDataset ; owl:deprecated "false" ; owl:versionInfo "2" ; skos:altLabel "AA optode 4831" , "AA optode 4831"@en ; skos:broader , ; skos: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. In this standard model, 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 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 areference phase reading by use of a red LED that does not produce fluorescence in the foil. This model is fitted with a standard sensing foil. 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."@en ; skos:inScheme ; skos:notation "SDN:L22::TOOL1239" ; skos:note "accepted"@en ; skos:prefLabel "Aanderaa 4831 oxygen optode"@en ; skos:related , . skos:related . sssom:object_id .