exported
equivalent
densitometer
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Densitometer
Generated on 2026-04-16
Natural Language Definition
EN
A densitometer is an instrument that bears a density measurement function.
PT-BR
Um densitômetro é um instrumento que possui uma função de medição de densidade.
Formal Axioms
Semi-formal (Aristotelian)
Every densitometer is an instrument that has the function of measuring density.
First-Order Logic Theory
Loading…
▸ Stored override
∀x(Densitometer(x) ↔ Instrument(x) ∧ ∃f(DensityMeasurementFunction(f) ∧ bearerOf(x,f)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: Densitometer
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-09"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000463 rdf:type owl:Class ; # DensityMeasurementFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000464 # DensityMeasurementProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000464 # DensityMeasurementProcess
] ;
rdfs:label "density measurement function"@en ;
rdfs:label "função de medição de densidade"@pt-br ;
iof-av:naturalLanguageDefinition "A designed function borne by petroleum production equipment whose realization constitutes the measurement of the mass per unit volume of a fluid stream or substance."@en ;
skos:definition "A designed function borne by petroleum production equipment whose realization constitutes the measurement of the mass per unit volume of a fluid stream or substance."@en ;
iof-av:naturalLanguageDefinition "Uma função projetada portada por equipamento de produção de petróleo cuja realização consiste em medir a massa por unidade de volume de uma corrente de fluido ou substância."@pt-br .
### Process type
:COPI_0000464 rdf:type owl:Class ; # DensityMeasurementProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "density measurement process"@en ;
rdfs:label "processo de medição de densidade"@pt-br ;
iof-av:naturalLanguageDefinition "A planned process in which the mass per unit volume of a fluid stream or substance is measured by petroleum production instrumentation."@en ;
skos:definition "A planned process in which the mass per unit volume of a fluid stream or substance is measured by petroleum production instrumentation."@en ;
iof-av:naturalLanguageDefinition "Um processo planejado em que a massa por unidade de volume de uma corrente de fluido ou substância é medida pela instrumentação de produção de petróleo."@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000464 # DensityMeasurementProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom iof-core:InformationContentEntity
] .
### Equipment universal: Densitometer
:COPI_0000245 rdf:type owl:Class ; # Densitometer
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000091 # Instrument
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000463 # DensityMeasurementFunction
]
)
] ;
rdfs:label "densitometer"@en ;
rdfs:label "densitômetro"@pt-br ;
iof-av:naturalLanguageDefinition "A densitometer is an instrument that bears a density measurement function."@en ;
skos:definition "A densitometer is an instrument that bears a density measurement function."@en ;
iof-av:naturalLanguageDefinition "Um densitômetro é um instrumento que possui uma função de medição de densidade."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every densitometer is an instrument that has the function of measuring density."@en ;
iof-av:firstOrderLogicAxiom "∀x(Densitometer(x) ↔ Instrument(x) ∧ ∃f(DensityMeasurementFunction(f) ∧ bearerOf(x,f)))"@en ;
dcterms:source <https://standards.iso.org/iso/15926/-4/reference-data-item/DENSITOMETER> ;
dcterms:source <https://glossary.slb.com/en/terms/d/densitometer> ;
dcterms:source <https://onepetro.org/search-results?page=1&q=densitometer> .
# Disjointness: Densitometer and FlowMeter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000245 :COPI_0000278 ) . # Densitometer, FlowMeter
# Disjointness: Densitometer and PressureGauge
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000245 :COPI_0000143 ) . # Densitometer, PressureGauge
# Disjointness: Densitometer and TemperatureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000245 :COPI_0000155 ) . # Densitometer, TemperatureTransmitter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
DensityMeasurementFunction
⊑ DesignedFunction
Realized in
DensityMeasurementProcess
⊑ MeasurementProcess
All three definitions consistently identify density measurement as the core purpose. This is what makes a densitometer a densitometer rather than any other measuring instrument.
2
Genus Determination
Instrument
From the parent_candidates, 'MEASURING INSTRUMENT' is most specific. Since 'Instrument' (without 'measuring') appears in the enriched classes as the genus for controllers, detectors, indicators, etc., and measuring is a subset of instrument functionality, 'Instrument' is the appropriate genus. This follows the pattern of other measuring devices in the enriched list.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
These are the minimal universal parts - every densitometer needs a sensing mechanism and output capability. Specific sensor types (photoelectric cell, gamma detector) are subtype-specific.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— substance whose density is to be measured
Outputs (O)
InformationContentEntity
— density measurement data
Transformation (T)
transduction of material density property to information signal
Densitometers transform physical density information into measurable/transmittable data. The input is any material whose density needs measurement, output is density information.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Disjointness Axioms
flow meter
pressure gauge
temperature transmitter
C2: flow meter. C?: pressure gauge [kind_ambiguous]. C?: temperature transmitter [kind_ambiguous]. These instruments have incompatible measurement functions - an instrument cannot simultaneously measure density and flow rate, or density and pressure, as primary functions.
Cross-Standard Observations
ISO 15926 focuses on photographic/optical density measurement while SLB and OnePetro definitions emphasize fluid density measurement in industrial applications. This suggests densitometer is a broader category encompassing both optical and fluid density measurement instruments.
