Core Ontology for Petroleum Installations · INF-UFRGS-Ontologies · CNPq INF-UFRGS-ENERGIA inf.ufrgs.br/ontologies/copi dee69df
ISA 5.1 symbol for absolute pressure transmitter
exported necessary
absolute pressure transmitter
IRI: http://www.inf.ufrgs.br/ontologies/copi#Absolutepressuretransmitter
Generated on 2026-04-16
Natural Language Definition
EN
An absolute pressure transmitter is a pressure transmitter that has a vacuum reference chamber on one side of the pressure sensor while the other side receives the process pressure.
PT-BR
Um transmissor de pressão absoluta é um transmissor de pressão que possui uma câmara de referência de vácuo de um lado do sensor de pressão enquanto o outro lado recebe a pressão do processo.
Formal Axioms
Semi-formal (Aristotelian)
Every absolute pressure transmitter is a pressure transmitter that has a vacuum reference chamber as a component part at all times.
First-Order Logic Theory
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▸ Stored override ∀x (AbsolutePressureTransmitter(x) → PressureTransmitter(x) ∧ ∃y (VacuumReferenceChamber(y) ∧ hasComponentPartAtAllTimes(x,y)))
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: AbsolutePressureTransmitter <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_0000031 rdf:type owl:Class ; # PressureTransmissionFunction rdfs:subClassOf :COPI_0000030 ; # SignalTransmissionFunction rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000054 ; # realizedIn owl:allValuesFrom :COPI_0000614 # PressureTransmissionProcess ] ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000054 ; # realizedIn owl:someValuesFrom :COPI_0000614 # PressureTransmissionProcess ] ; rdfs:label "pressure transmission function"@en ; rdfs:label "função de transmissão de pressão"@pt-br . :COPI_0000030 rdf:type owl:Class . # SignalTransmissionFunction ### Process type :COPI_0000614 rdf:type owl:Class ; # PressureTransmissionProcess rdfs:subClassOf iof-core:MeasurementProcess ; rdfs:label "pressure transmission process"@en ; rdfs:label "processo de transmissão de pressão"@pt-br . iof-core:MeasurementProcess rdf:type owl:Class . :COPI_0000614 # PressureTransmissionProcess 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: AbsolutePressureTransmitter :COPI_0000205 rdf:type owl:Class ; # AbsolutePressureTransmitter rdfs:subClassOf :COPI_0000144 ; # PressureTransmitter rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart) owl:someValuesFrom :COPI_0000031 # PressureTransmissionFunction ] ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasComponentPartAtAllTimes ; owl:someValuesFrom :COPI_0000684 # VacuumReferenceChamber ] ; rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty iof-core:hasComponentPartAtAllTimes ; owl:someValuesFrom :COPI_0000612 # PressureSensor ] ; rdfs:label "absolute pressure transmitter"@en ; rdfs:label "transmissor de pressão absoluta"@pt-br ; iof-av:naturalLanguageDefinition "An absolute pressure transmitter is a pressure transmitter that has a vacuum reference chamber on one side of the pressure sensor while the other side receives the process pressure."@en ; skos:definition "An absolute pressure transmitter is a pressure transmitter that has a vacuum reference chamber on one side of the pressure sensor while the other side receives the process pressure."@en ; iof-av:naturalLanguageDefinition "Um transmissor de pressão absoluta é um transmissor de pressão que possui uma câmara de referência de vácuo de um lado do sensor de pressão enquanto o outro lado recebe a pressão do processo."@pt-br ; iof-av:semiFormalNaturalLanguageAxiom "Every absolute pressure transmitter is a pressure transmitter that has a vacuum reference chamber as a component part at all times."@en ; iof-av:firstOrderLogicAxiom "∀x (AbsolutePressureTransmitter(x) → PressureTransmitter(x) ∧ ∃y (VacuumReferenceChamber(y) ∧ hasComponentPartAtAllTimes(x,y)))"@en ; iof-av:isPrimitive "true"^^xsd:boolean ; iof-av:primitiveRationale "Constructive classification based on vacuum reference chamber configuration. Under Open World Assumption, defining sufficient conditions could lead to unintended classification of complex instruments that contain vacuum chambers but serve different primary functions. The structural differentia is necessary but making it sufficient requires domain expert validation."@en ; skos:definition "[ISO 15926-4] An <ABSOLUTE PRESSURE TRANSMITTER> is a <PRESSURE TRANSMITTER> and an <ABSOLUTE PRESSURE MEASURING INSTRUMENT>"@en ; skos:definition "[CFIHOS] A pressure transmitter where pressure is applied to one side of the sensor while the other side has a vacuum chamber."@en . :COPI_0000684 rdf:type owl:Class ; # VacuumReferenceChamber rdfs:subClassOf iof-core:MaterialArtifact ; rdfs:label "câmara de vácuo de referência"@pt-br ; rdfs:label "vacuum reference chamber"@en . :COPI_0000612 rdf:type owl:Class ; # PressureSensor rdfs:subClassOf iof-core:Assembly ; rdfs:label "sensor de pressão"@pt-br ; rdfs:label "pressure sensor"@en .
Axiomatization Decision Log
1 Identity-Giving Function
Function class
PressureTransmissionFunction ⊑ SignalTransmissionFunction
Realized in
PressureTransmissionProcess ⊑ MeasurementProcess
The identity-giving function is pressure transmission - converting pressure measurements into standardized signals for transmission to control systems. This is the same core function as other pressure transmitters, with the absolute measurement capability being a constructive differentia rather than a distinct function.
2 Genus Determination
PressureTransmitter
The genus is 'pressure transmitter' which is already enriched in our ontology and appears in the parent candidates from ISO 15926. This is the most specific appropriate superclass - all absolute pressure transmitters are pressure transmitters with the additional structural constraint of having a vacuum reference chamber.
3 Necessary Parts
Part class Parent Relation
VacuumReferenceChamber MaterialArtifact hasComponentPartAtAllTimes
PressureSensor Assembly hasComponentPartAtAllTimes
The vacuum reference chamber is the key differentiating part that must be present in all absolute pressure transmitters, while the pressure sensor is inherited from the genus.
4 Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid — process fluid at unknown absolute pressure
Outputs (O)
InformationContentEntity — proportional to absolute pressure
Transformation (T)
pressure measurement transduction with vacuum reference
Takes process fluid pressure as input and outputs electrical signal proportional to absolute pressure using vacuum chamber as reference.
5 Axiom Mode Decision

Necessary conditions only — modelled as a primitive universal (⊑, SubClassOf). Identity is grounded in designed function and cannot be reduced to a property checklist.

Constructive classification based on vacuum reference chamber configuration. Under Open World Assumption, defining sufficient conditions could lead to unintended classification of complex instruments that contain vacuum chambers but serve different primary functions. The structural differentia is necessary but making it sufficient requires domain expert validation.
Cross-Standard Observations
ISO 15926 provides hierarchical context showing it as both a pressure transmitter and absolute pressure measuring instrument. CFIHOS provides the technical detail about the vacuum chamber construction that enables the absolute measurement capability.

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