exported
equivalent
level indicator
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Levelindicator
Generated on 2026-05-02
Natural Language Definition
EN
A level indicator is an indicator that measures and locally displays the level of liquid or bulk solid material in a vessel or tank.
PT-BR
Um indicador de nível é um indicador que mede e exibe localmente o nível de material líquido ou sólido a granel em um vaso ou tanque.
Formal Axioms
Semi-formal (Aristotelian)
Every level indicator is an indicator that has the function to measure and locally indicate level.
First-Order Logic Theory
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▸ Stored override
∀x (LevelIndicator(x) ↔ (Indicator(x) ∧ ∃f (LevelIndicationFunction(f) ∧ hasFunction(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: LevelIndicator
<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 "2026-10-07"^^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_0000172 rdf:type owl:Class ; # LevelIndicationFunction
rdfs:subClassOf :COPI_0000028 ; # IndicationFunction
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000564 # LevelIndicationProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000564 # LevelIndicationProcess
] ;
rdfs:label "level indication function"@en ;
rdfs:label "função de indicação de nível"@pt-br .
:COPI_0000028 rdf:type owl:Class . # IndicationFunction
### Process type
:COPI_0000564 rdf:type owl:Class ; # LevelIndicationProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "level indication process"@en ;
rdfs:label "processo de indicação de nível"@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000564 # LevelIndicationProcess
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:hasInput ;
owl:someValuesFrom :COPI_0000040 # PortionOfSolid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000046 # VisualIndication
] .
### Equipment universal: LevelIndicator
:COPI_0000129 rdf:type owl:Class ; # LevelIndicator
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_0000172 # LevelIndicationFunction
]
)
] ;
rdfs:label "level indicator"@en ;
rdfs:label "indicador de nível"@pt-br ;
iof-av:naturalLanguageDefinition "A level indicator is an indicator that measures and locally displays the level of liquid or bulk solid material in a vessel or tank."@en ;
skos:definition "A level indicator is an indicator that measures and locally displays the level of liquid or bulk solid material in a vessel or tank."@en ;
iof-av:naturalLanguageDefinition "Um indicador de nível é um indicador que mede e exibe localmente o nível de material líquido ou sólido a granel em um vaso ou tanque."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every level indicator is an indicator that has the function to measure and locally indicate level."@en ;
iof-av:firstOrderLogicAxiom "∀x (LevelIndicator(x) ↔ (Indicator(x) ∧ ∃f (LevelIndicationFunction(f) ∧ hasFunction(x,f))))"@en .
# Disjointness: LevelIndicator and LevelTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000129 :COPI_0000131 ) . # LevelIndicator, LevelTransmitter
# Disjointness: LevelIndicator and TemperatureIndicator
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000129 :COPI_0000154 ) . # LevelIndicator, TemperatureIndicator
# Disjointness: LevelIndicator and PressureGauge
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000129 :COPI_0000143 ) . # LevelIndicator, PressureGauge
Axiomatization Decision Log
1
Identity-Giving Function
Function class
LevelIndicationFunction
⊑ IndicationFunction
Realized in
LevelIndicationProcess
⊑ MeasurementProcess
The identity-giving function is to measure and locally display fluid or solid level - this distinguishes it from level transmitters (which provide remote signals) and other measurement instruments. This function already exists in the enriched ontology.
✓
Expert review — Accepted
2
Genus Determination
Indicator
Level indicator is a subtype of the general indicator class, which provides local display functionality. The enriched ontology already defines 'indicator' with IndicationFunction, making it the most specific appropriate superclass. No domain-specific parent candidates were provided, so this follows the natural hierarchy.
✓
Expert review — Accepted
"function_parent: DesignedFunction → IndicationFunction (LevelIndicationFunction ⊆ IndicationFunction)"
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
These two parts are universally necessary - the sensing element performs the measurement and the local display presents the information locally, which are the two essential functions of any level indicator
✓
Expert review — Accepted
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— contained in vessel or tank
PortionOfSolid
— bulk solid material in vessel or tank
Outputs (O)
VisualIndication
— local level display information
Transformation (T)
measurement transduction from physical level to visual indication
Level indicators measure either liquid or bulk solid level in containment and convert this to local visual indication for operator reading
✓
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
level transmitter
temperature indicator
pressure gauge
C2: temperature indicator, pressure gauge. C?: level transmitter [kind_ambiguous]. C?: level switch [kind_ambiguous]. Level transmitter provides remote signals (incompatible with local-only indication), level switch provides switching rather than continuous indication, temperature/pressure indicators measure different variables
Cross-Standard Observations
Only one source definition provided. The ISA definition clearly distinguishes level indicators from level transmitters by the absence of remote signal transmission capability, which is crucial for proper classification.
