exported
equivalent
flow indicator
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Flowindicator
Generated on 2026-04-13
Natural Language Definition
EN
A flow indicator is an indicator that is designed to indicate flow rates using a flow element and display element.
PT-BR
Um indicador de fluxo é um indicador projetado para indicar taxas de fluxo usando um elemento de medição de fluxo e elemento de exibição.
Formal Axioms
Semi-formal (Aristotelian)
Every flow indicator is an instrument that bears a flow indication function and has a flow element and display element as component parts.
First-Order Logic Theory
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▸ Stored override
∀x (FlowIndicator(x) ↔ (Instrument(x) ∧ ∃f(FlowIndicationFunction(f) ∧ bearerOf(x,f)) ∧ ∃e(FlowMeasuringElement(e) ∧ hasComponentPartAtSomeTime(x,e)) ∧ ∃d(DisplayElement(d) ∧ hasComponentPartAtAllTimes(x,d))))
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: FlowIndicator
<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 "2026-10-08"^^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_0000171 rdf:type owl:Class ; # FlowIndicationFunction
rdfs:subClassOf :COPI_0000028 ; # IndicationFunction
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000521 # FlowIndicationProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000521 # FlowIndicationProcess
] ;
rdfs:label "flow indication function"@en ;
rdfs:label "função de indicação de fluxo"@pt-br .
:COPI_0000028 rdf:type owl:Class . # IndicationFunction
### Process type
:COPI_0000521 rdf:type owl:Class ; # FlowIndicationProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "flow indication process"@en ;
rdfs:label "processo de indicação de fluxo"@pt-br .
:COPI_0000521 # FlowIndicationProcess
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 :COPI_0000046 # VisualIndication
] .
### Equipment universal: FlowIndicator
:COPI_0000117 rdf:type owl:Class ; # FlowIndicator
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000127 # Indicator
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000171 # FlowIndicationFunction
]
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasComponentPartAtAllTimes ;
owl:someValuesFrom :COPI_0000116 # FlowElement
]
)
] ;
rdfs:label "flow indicator"@en ;
rdfs:label "indicador de fluxo"@pt-br ;
iof-av:naturalLanguageDefinition "A flow indicator is an indicator that is designed to indicate flow rates using a flow element and display element."@en ;
skos:definition "A flow indicator is an indicator that is designed to indicate flow rates using a flow element and display element."@en ;
iof-av:naturalLanguageDefinition "Um indicador de fluxo é um indicador projetado para indicar taxas de fluxo usando um elemento de medição de fluxo e elemento de exibição."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every flow indicator is an instrument that bears a flow indication function and has a flow element and display element as component parts."@en ;
iof-av:firstOrderLogicAxiom "∀x (FlowIndicator(x) ↔ (Instrument(x) ∧ ∃f(FlowIndicationFunction(f) ∧ bearerOf(x,f)) ∧ ∃e(FlowMeasuringElement(e) ∧ hasComponentPartAtSomeTime(x,e)) ∧ ∃d(DisplayElement(d) ∧ hasComponentPartAtAllTimes(x,d))))"@en ;
skos:definition "[ISO 15926-4] A <FLOW INDICATOR> is an <INSTRUMENTATION ITEM> and a <FLOW MEASURING INSTRUMENT> and a <INDICATOR> that, using a <FLOW MEASURING ELEMENT>, is specially and exclusively designed for <INDICATING> a <FLOW RATE>"@en .
:COPI_0000116 rdf:type owl:Class ; # FlowElement
rdfs:subClassOf iof-core:MaterialArtifact ;
rdfs:label "elemento de vazão"@pt-br ;
rdfs:label "flow element"@en .
# Disjointness: FlowIndicator and FlowTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000117 :COPI_0000118 ) . # FlowIndicator, FlowTransmitter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
FlowIndicationFunction
⊑ IndicationFunction
Realized in
FlowIndicationProcess
⊑ PlannedProcess
The identity-giving function is to visually display or indicate flow rate measurements to human operators. This is distinct from flow measurement (sensing) or flow signal transmission - it specifically involves presenting flow information in a human-readable format.
✓
Expert review — Accepted
2
Genus Determination
Indicator
While the source lists FLOW MEASURING INSTRUMENT, INDICATOR, and INSTRUMENTATION ITEM as parents, the most specific appropriate genus is Instrument. Flow indicators are specialized instruments that both measure and display flow. The genus is not enriched in our current ontology but is the logical superclass for measurement and display devices.
✓
Expert review — Accepted
"genus: Instrument → indicator (id 133 is the most specific enriched superclass); bfo_root: MaterialArtifact → Assembly to align with indicator hierarchy"
3
Necessary Parts
| Part class | Parent | Relation |
|---|---|---|
| FlowElement | MaterialArtifact | hasComponentPartAtAllTimes |
Flow indicators require both measurement capability (flow element) and display capability (display element) to fulfill their designed function of indicating flow rates.
✓
Expert review — Accepted
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— flowing through measurement point
Outputs (O)
VisualIndication
— human-readable flow rate indication
Transformation (T)
measurement transduction and visual presentation
Takes a flowing fluid as input and produces visual information output showing the flow rate. The transformation involves sensing the flow and converting to visual display format.
✓
Expert review — Accepted
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
✓
Expert review — Accepted
Disjointness Axioms
FlowTransmitter
C?: FlowTransmitter [kind_ambiguous]. Incompatible process signatures: flow indicators output visual information for local display, while transmitters output electrical signals for remote monitoring, and controllers output control actions for flow manipulation
Cross-Standard Observations
Only one source definition available. The ISO 15926 definition clearly distinguishes flow indicators from other flow instruments by emphasizing the indication/display function rather than measurement alone or signal transmission.
