exported
equivalent
level transmitter
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Leveltransmitter
Generated on 2026-04-13
Natural Language Definition
EN
A level transmitter is a transmitter that measures the level (height) of liquid or bulk solid material in a container and produces a standardized electrical output signal proportional to the measured level.
PT-BR
Um transmissor de nível é um transmissor que mede o nível (altura) de material líquido ou sólido a granel em um recipiente e produz um sinal elétrico de saída padronizado proporcional ao nível medido.
Formal Axioms
Semi-formal (Aristotelian)
Every level transmitter is a transmitter that bears a LevelMeasurementAndTransmissionFunction
First-Order Logic Theory
Loading…
▸ Stored override
∀x(LevelTransmitter(x) ↔ (Transmitter(x) ∧ ∃f(LevelMeasurementAndTransmissionFunction(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: LevelTransmitter
<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_0000187 rdf:type owl:Class ; # LevelMeasurementAndTransmissionFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000565 # LevelMeasurementAndTransmissionProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000565 # LevelMeasurementAndTransmissionProcess
] ;
rdfs:label "level measurement and transmission function"@en ;
rdfs:label "função de medição e transmissão de nível"@pt-br .
### Process type
:COPI_0000565 rdf:type owl:Class ; # LevelMeasurementAndTransmissionProcess
rdfs:subClassOf iof-core:MeasurementProcess ;
rdfs:label "level measurement and transmission process"@en ;
rdfs:label "processo de medição e transmissão de nível"@pt-br .
iof-core:MeasurementProcess rdf:type owl:Class .
:COPI_0000565 # LevelMeasurementAndTransmissionProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000050 # LevelMeasurementResult
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom iof-core:InformationContentEntity
] .
### Equipment universal: LevelTransmitter
:COPI_0000131 rdf:type owl:Class ; # LevelTransmitter
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000157 # Transmitter
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000187 # LevelMeasurementAndTransmissionFunction
]
)
] ;
rdfs:label "level transmitter"@en ;
rdfs:label "transmissor de nível"@pt-br ;
iof-av:naturalLanguageDefinition "A level transmitter is a transmitter that measures the level (height) of liquid or bulk solid material in a container and produces a standardized electrical output signal proportional to the measured level."@en ;
skos:definition "A level transmitter is a transmitter that measures the level (height) of liquid or bulk solid material in a container and produces a standardized electrical output signal proportional to the measured level."@en ;
iof-av:naturalLanguageDefinition "Um transmissor de nível é um transmissor que mede o nível (altura) de material líquido ou sólido a granel em um recipiente e produz um sinal elétrico de saída padronizado proporcional ao nível medido."@pt-br ;
rdfs:subClassOf [ rdf:type owl:Restriction ; owl:onProperty bfo:BFO_0000196 ; owl:someValuesFrom :COPI_0000058 ] ;
skos:definition "[ISO 15926-4] A <LEVEL TRANSMITTER> is a <PROCESS VARIABLE TRANSMITTER> and a <LEVEL MEASURING INSTRUMENT>"@en ;
skos:definition "[CFIHOS] A transmitter that produces a continuous standardized output signal dependent of a received input signal from a level sensor."@en ;
skos:definition "[ISA 5.1] ISA 5.1 tag abbreviation 'LT'. First letter 'L': Level. Succeeding letters: 'T' = Transmit."@en ;
skos:definition "[POSC Caesar] A transmitter that is producing a continuous standardized output signal dependent of a received input signal from a level sensor."@en .
# Disjointness: LevelTransmitter and PressureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000131 :COPI_0000144 ) . # LevelTransmitter, PressureTransmitter
# Disjointness: LevelTransmitter and TemperatureTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000131 :COPI_0000155 ) . # LevelTransmitter, TemperatureTransmitter
# Disjointness: LevelTransmitter and FlowTransmitter
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000131 :COPI_0000118 ) . # LevelTransmitter, FlowTransmitter
Axiomatization Decision Log
1
Identity-Giving Function
Function class
LevelMeasurementAndTransmissionFunction
⊑ DesignedFunction
Realized in
LevelMeasurementAndTransmissionProcess
⊑ MeasurementProcess
The identity-giving function combines level measurement with signal transmission. This is what distinguishes a level transmitter from other transmitters (pressure, temperature, flow) and from level instruments that don't transmit signals.
✓
Expert review — Accepted
2
Genus Determination
Transmitter
From parent candidates, 'transmitter' is the most specific and appropriate genus. ISO 15926 defines level transmitter as a subtype of PROCESS VARIABLE TRANSMITTER, and transmitter is already enriched in our ontology with SignalTransmissionFunction. Level transmitter adds the specific level measurement capability to the general transmission function.
✓
Expert review — Accepted
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
Level transmitters universally require a sensing element for level detection and signal conditioning electronics to produce the standardized output signal. The specific sensor technology varies by subtype.
✓
Expert review — Accepted
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
LevelMeasurementResult
— from process fluid/material
Outputs (O)
InformationContentEntity
— proportional to measured level
Transformation (T)
measurement and signal conversion - level information transduced to electrical signal
Level transmitters receive level information from the process and electrical power, converting level data to standardized electrical output signals (typically 4-20mA)
✓
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
TemperatureTransmitter
FlowTransmitter
C2: PressureTransmitter, TemperatureTransmitter, FlowTransmitter. Different process variables measured - level vs pressure vs temperature vs flow rate are mutually exclusive measurement functions
Cross-Standard Observations
All sources consistently define level transmitters as devices that measure level and produce standardized output signals. CFIHOS and POSC Caesar emphasize the continuous signal output from level sensor input. ISO 15926 positions it as both a process variable transmitter and level measuring instrument, confirming the dual measurement-transmission function.
Source Definitions
4 sources
ISO 15926-4
LEVEL TRANSMITTER ↗
Definition text withheld (copyrighted standard) — follow the source link above.
CFIHOS
level transmitter
Definition text withheld (copyrighted standard) — follow the source link above.
isa5_1
Level Transmitter ↗
Definition text withheld (copyrighted standard) — follow the source link above.
POSC Caesar
Level 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 |
| ID | #67 |
| Cluster | level transmitter |
| Status | exported |
| Axiom mode | equivalent |
| Created | 2026-04-13 |
| Updated | 2026-09-08 |
ISA 5.1-2022 P&ID Symbol
5_2_1/001_transmitter_with_integral_primary_element_bubble_format.png
