validated
necessary
process variable transmitter
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Processvariabletransmitter
Generated on 2026-09-10
Natural Language Definition
EN
A process variable transmitter is a transmitter that sends a standardized signal representing the measurement of a process variable.
PT-BR
Um transmissor de variável de processo é um transmissor que envia um sinal padronizado que representa a medição de uma variável de processo.
Formal Axioms
Semi-formal (Aristotelian)
Every process variable transmitter is a transmitter that bears a signal transmission function.
First-Order Logic Theory
Loading…
▸ Stored override
∀x (ProcessVariableTransmitter(x) → Transmitter(x) ∧ ∃f (SignalTransmissionFunction(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: ProcessVariableTransmitter
<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_0000030 rdf:type owl:Class ; # SignalTransmissionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000035 # SignalTransmissionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000035 # SignalTransmissionProcess
] ;
rdfs:label "signal transmission function"@en ;
rdfs:label "função de transmissão de sinal"@pt-br ;
iof-av:naturalLanguageDefinition "A DesignedFunction that is realized in an IndicatingTransmissionProcess and that consists in both indicating a measured process variable locally and transmitting its value to a remote display, recorder, or control system."@en ;
skos:definition "A DesignedFunction that is realized in an IndicatingTransmissionProcess and that consists in both indicating a measured process variable locally and transmitting its value to a remote display, recorder, or control system."@en .
### Process type
:COPI_0000035 rdf:type owl:Class ; # SignalTransmissionProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "signal transmission process"@en ;
rdfs:label "processo de transmissão de sinal"@pt-br ;
iof-av:naturalLanguageDefinition "A MeasurementProcess (hence planned) in which a sensed process variable is displayed locally and simultaneously converted into a standardized signal transmitted to a remote system."@en ;
skos:definition "A MeasurementProcess (hence planned) in which a sensed process variable is displayed locally and simultaneously converted into a standardized signal transmitted to a remote system."@en .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000035 # SignalTransmissionProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom iof-core:MeasurementInformationContentEntity
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom iof-core:InformationContentEntity
] .
### Equipment universal: ProcessVariableTransmitter
:COPI_0000769 rdf:type owl:Class ; # ProcessVariableTransmitter
rdfs:subClassOf :COPI_0000157 ; # Transmitter
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000030 # SignalTransmissionFunction
] ;
rdfs:label "process variable transmitter"@en ;
rdfs:label "transmissor de variável de processo"@pt-br ;
iof-av:naturalLanguageDefinition "A process variable transmitter is a transmitter that sends a standardized signal representing the measurement of a process variable."@en ;
skos:definition "A process variable transmitter is a transmitter that sends a standardized signal representing the measurement of a process variable."@en ;
iof-av:naturalLanguageDefinition "Um transmissor de variável de processo é um transmissor que envia um sinal padronizado que representa a medição de uma variável de processo."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every process variable transmitter is a transmitter that bears a signal transmission function."@en ;
iof-av:firstOrderLogicAxiom "∀x (ProcessVariableTransmitter(x) → Transmitter(x) ∧ ∃f (SignalTransmissionFunction(f) ∧ bearerOf(x,f)))"@en ;
iof-av:isPrimitive "true"^^xsd:boolean ;
iof-av:primitiveRationale "Same genus function as Transmitter (same-genus same-function rule): equivalence would collapse it onto Transmitter."@en ;
dcterms:source <https://standards.iso.org/iso/15926/-4/reference-data-item/PROCESS_VARIABLE_TRANSMITTER> .
Axiomatization Decision Log
1
Identity-Giving Function
Function class
SignalTransmissionFunction
⊑ DesignedFunction
Realized in
SignalTransmissionProcess
⊑ MeasurementProcess
Reuse case: ISO 15926-4 defines the class as 'a MEASURING INSTRUMENT and a STANDARD SIGNAL SENDER and a TRANSMITTER for a PROCESS VARIABLE measurement', which is the transmitter's own function. Revised 2026-09-15: IndicatingTransmissionFunction had no basis in the primary source (local indication came from ISA 5.1 PIT/FIT/LIT/TIT tags, which are subtypes).
2
Genus Determination
Transmitter
Primary source names TRANSMITTER directly as parent, and it is already enriched (exported); used as genus rather than the unenriched intermediate MEASURING INSTRUMENT / STANDARD SIGNAL SENDER hierarchy, matching the colleague's own suggestion to anchor to the existing 'transmitter' cluster.
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
No structural component (e.g. a specific display type) is named verbatim in PROCESS VARIABLE TRANSMITTER's own definition or in the ISA-5.1 tag-abbreviation entries, which describe only the letter-code convention, not construction.
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
MeasurementInformationContentEntity
— measurable physical quantity
Outputs (O)
InformationContentEntity
— 4-20mA, digital protocol, or pneumatic
Transformation (T)
process variable signal transduction and conditioning
Transmitters consistently transform physical process variables into standardized electrical, pneumatic, or digital signals suitable for transmission to control systems, displays, or data acquisition systems.
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.
Same genus function as Transmitter (same-genus same-function rule): equivalence would collapse it onto Transmitter.
Cross-Standard Observations
ISO 15926-4's PROCESS VARIABLE TRANSMITTER is generic (no process variable named) but silent on local indication. ISA-5.1's tag-abbreviation convention (AIT/FIT/LIT/PIT/TIT -- all real, ingested terms.db entries) independently confirms 'Indicate'+'Transmit' as a combinable, variable-agnostic capability pair, and the already-enriched sibling 'pressure indicating transmitter' models exactly this pattern for one variable. This entry generalizes it across variables rather than creating four more variable-specific siblings (flow/level/temperature/analyser indicating transmitter), per the colleague's request for a generic anchor.
Reviewer Notes
User-directed anchor choice: generalize the already-enriched 'pressure indicating transmitter' pattern to a variable-agnostic entry, anchored to the real ISO 15926-4 term PROCESS VARIABLE TRANSMITTER but genus set to the already-enriched 'Transmitter' cluster rather than the unenriched MEASURING INSTRUMENT/STANDARD SIGNAL SENDER hierarchy. The 5 ISA-5.1 'X Indicating Transmitter' tag-abbreviation entries corroborate that Indicate+Transmit is a combinable, variable-independent capability pair in real instrumentation convention, not this entry's own invention. 2026-09-15 export review: function realigned to Transmitter's SignalTransmissionFunction; VisualIndication output and indicating-transmitter reading removed (no basis in ISO 15926-4).
Source Definitions
1 source
ISO 15926-4
PROCESS VARIABLE TRANSMITTER ↗
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 |
| Reviewer | claude-code-session |
| ID | #1130 |
| Cluster | process variable transmitter |
| Status | validated |
| Axiom mode | necessary |
| Created | 2026-09-10 |
| Updated | 2026-09-15 |
ISA 5.1-2022 P&ID Symbol
5_2_1/001_transmitter_with_integral_primary_element_bubble_format.png
