@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @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: . skos:altLabel "AA optode 4330" , "AA optode 4330"@en ; skos:broader , ; skos:definition "A dissolved oxygen sensor that uses a standard sensing foil for use with Aanderaa data loggers. Data collection is based on the ability of selected substances to act as dynamic fluorescent quenchers. The platinum porphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water is the fluorescent indicator. Modulated blue light excites the sensor, which in turn measures the phase of the returned red light. Stability is improved by means of a reference phase reading using a red LED that does not produce fluorescence in the foil. The standard sensing foil is protected by an opticalisolation layer which makes the foil extra rugged and insensitive to direct sunlight. y linearizing and temperature compensating, with an incorporated temperature sensor, the absolute O2 concentration can be determined. Oxygen response time (63%) is <25 secs. Accuracy is <8 microMolar O2 or 5% (whichever is greater). It is depth-rated to 6000 m."@en ; skos:inScheme ; skos:notation "SDN:L22::TOOL1247" ; skos:note "accepted"@en ; skos:prefLabel "Aanderaa 4330 oxygen optode"@en ; skos:related , . skos:member . skos:narrower . skos:related . skos:related . skos:narrower . skos:related . skos:narrower . skos:narrower . skos:related .