exported
equivalent
pressure gauge
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Pressuregauge
Generated on 2026-04-15
Natural Language Definition
EN
A pressure gauge is an indicator that bears the function of measuring and displaying pressure values.
PT-BR
Um manômetro é um indicador que possui a função de medir e exibir valores de pressão.
Formal Axioms
Semi-formal (Aristotelian)
Every pressure gauge is an instrument that has the function to measure and display pressure
First-Order Logic Theory
Loading…
▸ Stored override
∀x (PressureGauge(x) ↔ (Instrument(x) ∧ ∃f (PressureMeasurementFunction(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: PressureGauge
<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_0000178 rdf:type owl:Class ; # PressureMeasurementFunction
rdfs:subClassOf :COPI_0000028 ; # IndicationFunction
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000608 # PressureMeasurementProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000608 # PressureMeasurementProcess
] ;
rdfs:label "pressure measurement function"@en ;
rdfs:label "função de medição de pressão"@pt-br .
:COPI_0000028 rdf:type owl:Class . # IndicationFunction
### Process type
:COPI_0000608 rdf:type owl:Class ; # PressureMeasurementProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "pressure measurement process"@en ;
rdfs:label "processo de medição de pressão"@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000608 # PressureMeasurementProcess
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_0000048 # PressureMeasurementResult
] .
### Equipment universal: PressureGauge
:COPI_0000143 rdf:type owl:Class ; # PressureGauge
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_0000178 # PressureMeasurementFunction
]
)
] ;
rdfs:label "pressure gauge"@en ;
rdfs:label "manômetro"@pt-br ;
iof-av:naturalLanguageDefinition "A pressure gauge is an indicator that bears the function of measuring and displaying pressure values."@en ;
skos:definition "A pressure gauge is an indicator that bears the function of measuring and displaying pressure values."@en ;
iof-av:naturalLanguageDefinition "Um manômetro é um indicador que possui a função de medir e exibir valores de pressão."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every pressure gauge is an instrument that has the function to measure and display pressure"@en ;
iof-av:firstOrderLogicAxiom "∀x (PressureGauge(x) ↔ (Instrument(x) ∧ ∃f (PressureMeasurementFunction(f) ∧ bearerOf(x,f))))"@en ;
skos:definition "[ISO 15926-4] A <PRESSURE GAUGE> is a <PROCESS GAUGE> and a <PRESSURE MEASURING INSTRUMENT> using a <PRESSURE MEASURING ELEMENT>"@en ;
skos:definition "[CFIHOS] A gauge intended to measure and display a representation of a measured pressure."@en ;
skos:definition "[SLB Glossary] A device used to measure pressure."@en ;
skos:definition "[POSC Caesar] A 'pressure measuring gauge' intended to measure and display a representation of a measured pressure"@en .
# Disjointness: PressureGauge and PressureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000143 :COPI_0000144 ) . # PressureGauge, PressureTransmitter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
PressureMeasurementFunction
⊑ IndicationFunction
Realized in
PressureMeasurementProcess
⊑ MeasurementProcess
All definitions consistently identify measurement and display of pressure as the identity-giving function. This distinguishes pressure gauges from pressure transmitters (which transmit signals) and other pressure-related instruments.
✓
Expert review — Accepted
2
Genus Determination
Indicator
While parent candidates include PRESSURE MEASURING INSTRUMENT and PROCESS GAUGE from ISO15926, the most appropriate genus is the general Instrument class that encompasses all measuring and indicating devices. This is more specific than MaterialArtifact but captures the essential nature as a measuring device. Instrument is not yet enriched in our ontology but should be defined later as a measuring/monitoring device.
✓
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
No necessary parts recorded (concept may be primitive at this level).
These are the minimal essential components present in all pressure gauge implementations, regardless of technology or specific design.
✓
Expert review — Accepted
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— process fluid whose pressure is to be measured
Outputs (O)
PressureMeasurementResult
— displayed pressure value
Transformation (T)
pressure sensing and indication - converts fluid pressure to visual representation
Pressure gauges are passive measuring devices that sense the pressure of a connected fluid and provide a visual indication without altering the measured fluid.
✓
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
PressureTransmitter
C?: PressureTransmitter [kind_ambiguous]. Different process signatures: transmitters output electrical signals, switches output discrete on/off signals, regulators modify pressure rather than just measuring it
Cross-Standard Observations
All sources consistently define pressure gauge as a measuring and display device. ISO15926 provides the most detailed hierarchical context with multiple subtypes. The definitions are remarkably consistent across standards, focusing on the measurement and display functions.
Source Definitions
4 sources
ISO 15926-4
PRESSURE GAUGE ↗
Definition text withheld (copyrighted standard) — follow the source link above.
CFIHOS
pressure gauge
Definition text withheld (copyrighted standard) — follow the source link above.
SLB Glossary
pressure gauge ↗
Definition text withheld (copyrighted standard) — follow the source link above.
POSC Caesar
Pressure Gauge ↗
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 | #124 |
| Cluster | pressure gauge |
| Status | exported |
| Axiom mode | equivalent |
| Created | 2026-04-15 |
| Updated | 2026-09-08 |
ISA 5.1-2022 P&ID Symbol
5_2_3/044_pressure_gage.png
