@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 sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "An instrument, or more commonly a package of sensors sharing a common data logger, incorporating a temperature sensor, an electrical conductivity sensor and a pressure sensor. With a CTD, salinity is computed digitally from conductivity and temperature and depth below the sea surface is computed from pressure. With an STD salinity was output directly based on internal analogue circuitry."@en ; sdo:inDefinedTermSet ; sdo:name "CTD or STD"@en ; sdo:termCode "SDN:S04::S0459" .