exported
equivalent
level switch
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Levelswitch
Generated on 2026-04-16
Natural Language Definition
EN
A level switch is an instrument that bears a LevelSwitchingFunction, combining level detection with switching capability to provide discrete on/off electrical signals when fluid or particulate material levels reach preset values.
PT-BR
Um interruptor de nível é um instrumento que possui uma Função de Comutação de Nível, combinando detecção de nível com capacidade de comutação para fornecer sinais elétricos discretos ligado/desligado quando níveis de fluidos ou materiais particulados atingem valores predefinidos.
Formal Axioms
Semi-formal (Aristotelian)
Every level switch is an instrument that has the function of level switching and outputs discrete electrical signals based on preset level conditions.
First-Order Logic Theory
Loading…
▸ Stored override
∀x(LevelSwitch(x) ↔ (Instrument(x) ∧ ∃f(LevelSwitchingFunction(f) ∧ bearerOf(x,f)) ∧ ∃s(InformationContentEntity(s) ∧ hasOutput(x,s))))
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: LevelSwitch
<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_0000566 rdf:type owl:Class ; # LevelSwitchingFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000567 # LevelSwitchingProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000567 # LevelSwitchingProcess
] ;
rdfs:label "level switching function"@en ;
rdfs:label "função de chaveamento de nível"@pt-br .
### Process type
:COPI_0000567 rdf:type owl:Class ; # LevelSwitchingProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "level switching process"@en ;
rdfs:label "processo de chaveamento de nível"@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000567 # LevelSwitchingProcess
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: LevelSwitch
:COPI_0000309 rdf:type owl:Class ; # LevelSwitch
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_0000566 # LevelSwitchingFunction
]
)
] ;
rdfs:label "level switch"@en ;
rdfs:label "interruptor de nível"@pt-br ;
iof-av:naturalLanguageDefinition "A level switch is an instrument that bears a LevelSwitchingFunction, combining level detection with switching capability to provide discrete on/off electrical signals when fluid or particulate material levels reach preset values."@en ;
skos:definition "A level switch is an instrument that bears a LevelSwitchingFunction, combining level detection with switching capability to provide discrete on/off electrical signals when fluid or particulate material levels reach preset values."@en ;
iof-av:naturalLanguageDefinition "Um interruptor de nível é um instrumento que possui uma Função de Comutação de Nível, combinando detecção de nível com capacidade de comutação para fornecer sinais elétricos discretos ligado/desligado quando níveis de fluidos ou materiais particulados atingem valores predefinidos."@pt-br ;
rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000196 ; owl:someValuesFrom :COPI_0000058 ] ;
skos:definition "[ISO 15926-4] A <LEVEL SWITCH> is an <INSTRUMENTATION ITEM> and a <LEVEL MEASURING INSTRUMENT>"@en ;
skos:definition "[CFIHOS] A functional switch that is intended to give an on/off signal when particulate material or fluid level have reached a pre-set value."@en ;
skos:definition "[POSC Caesar] A functional switch that is intended to give an on/off signal when particulate material or fluid level have reached a preset value."@en .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
LevelSwitchingFunction
⊑ DesignedFunction
Realized in
LevelSwitchingProcess
⊑ MeasurementProcess
The identity-giving function is to provide discrete on/off switching signals when fluid or particulate material levels reach preset values. This combines level sensing with switching actuation.
2
Genus Determination
Instrument
From parent_candidates, INSTRUMENTATION ITEM and LEVEL MEASURING INSTRUMENT point to instrumentation hierarchy. 'Instrument' is the most specific appropriate superclass for measurement and control devices. Control switch is too narrow as it excludes the measurement aspect. Not enriched yet in our ontology.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
All level switches require sensing, switching, and output components regardless of the specific detection principle used.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— variable level
Outputs (O)
InformationContentEntity
— on/off state indication
Transformation (T)
level state transduction to electrical switching signal
Transforms physical level information into discrete electrical switching signals for control system use.
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
Cross-Standard Observations
All three sources consistently define level switch as providing on/off signals at preset level values. ISO 15926 emphasizes it as both instrumentation item and level measuring instrument, while CFIHOS and POSC provide more operational detail about the switching function.
Source Definitions
3 sources
ISO 15926-4
LEVEL SWITCH ↗
Definition text withheld (copyrighted standard) — follow the source link above.
CFIHOS
level switch
Definition text withheld (copyrighted standard) — follow the source link above.
POSC Caesar
Level Switch ↗
Definition text withheld (copyrighted standard) — follow the source link above.
Metadata
| Ontology | COPI |
| Research group | INF-UFRGS-Ontologies |
| Funding | CNPq INF-UFRGS-ENERGIA |
| Project | OntoKG / Petrobras |
| ID | #217 |
| Cluster | level switch |
| Status | exported |
| Axiom mode | equivalent |
| Created | 2026-04-16 |
| Updated | 2026-09-08 |
ISA 5.1-2022 P&ID Symbol
5_1_1/002_located_in_field.png
