#### 7.3.3.5 IfcFlowMeter

| Appareil de mesure de débit
| Zähler (allgemein)

A flow meter is a device that is used to measure the flow rate in a system.

> HISTORY New entity in IFC4

## Plumbing System Design

Instance diagram

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | R | R | R | R |  |  | R | R | R
Export |  |  |  |  | R | R | R | R |  |  | R | R | R

Object Typing

The Object Typing concept applies to this entity as shown in Table 82.

Type
IfcFlowMeterType
Table 82 — IfcFlowMeter Object Typing

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  |  |  |  | R |  | R

Properties for Occurrences

The Properties for Occurrences concept applies to this entity as shown in Table 83.

PredefinedType | Name
--- | ---
| Pset_FlowMeterOccurrence
| Pset_FlowMeterTypeCommon
ENERGYMETER | Pset_FlowMeterTypeEnergyMeter
Table 83 — IfcFlowMeter Properties for Occurrences

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | R | R |  |  |  |  |  |  |
Export |  |  |  |  | R | R |  | O |  |  | O | O | O

Ports

The Ports concept applies to this entity as shown in Table 84.

PredefinedType | Name | Flow | Type | Description
--- | --- | --- | --- | ---
GASMETER | Inlet | SINK | GAS | Inlet from utility.
GASMETER | Outlet | SOURCE | GAS | Measured use.
WATERMETER | Inlet | SINK | DOMESTICCOLDWATER | Inlet from utility.
WATERMETER | Outlet | SOURCE | DOMESTICCOLDWATER | Measured use.
Table 84 — IfcFlowMeter Ports

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  | R |  |  |  |  |  |  |
Export |  |  |  |  |  | R |  | R |  |  | R | R | R

Placement

The Placement concept applies to this entity as shown in Table 85.

Type
IfcLocalPlacement
Table 85 — IfcFlowMeter Placement

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  |  |  |  |  |  |

Body Geometry

The Body Geometry concept applies to this entity as shown in Table 86.

RepresentationType | Geometry
--- | ---
MappedRepresentation | IfcMappedItem
Table 86 — IfcFlowMeter Body Geometry

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

Spatial Containment

The Spatial Containment concept applies to this entity as shown in Table 87.

Structure | Description
--- | ---
IfcSite | Electrical meters are typically placed next to a building on the exterior.
Table 87 — IfcFlowMeter Spatial Containment

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  |
Export |  |  |  |  |  |  |  | R |  |  | R | R | R

XSD Specification:

<xs:element name="IfcFlowMeter" type="ifc:IfcFlowMeter" substitutionGroup="ifc:IfcFlowController" nillable="true"/>
<xs:complexType name="IfcFlowMeter">
<xs:complexContent>
<xs:extension base="ifc:IfcFlowController"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcFlowMeter

| SUBTYPE OF (IfcFlowController);

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| WHERE

CorrectPredefinedType | : | NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcFlowMeterTypeEnum.USERDEFINED) OR ((PredefinedType = IfcFlowMeterTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned | : | (SIZEOF(IsTypedBy) = 0) OR ('IFCHVACDOMAIN.IFCFLOWMETERTYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));

END_ENTITY;

Formal Propositions:

CorrectPredefinedType | : | Either the PredefinedType attribute is unset (e.g. because an IfcFlowMeterType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned | : | Either there is no flow meter type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcFlowMeterType.

Inheritance Graph:

ENTITY IfcFlowMeter

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
Nests | : | SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy | : | SET OF IfcRelNests FOR RelatingObject;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsDeclaredBy | : | SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares | : | SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy | : | SET OF IfcRelDefinesByProperties FOR RelatedObjects;

| ENTITY IfcProduct

ObjectPlacement | : | OPTIONAL IfcObjectPlacement;
Representation | : | OPTIONAL IfcProductRepresentation;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

ConnectedTo | : | SET OF IfcRelConnectsElements FOR RelatingElement;
IsInterferedByElements | : | SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements | : | SET OF IfcRelInterferesElements FOR RelatingElement;
HasOpenings | : | SET OF IfcRelVoidsElement FOR RelatingBuildingElement;
ProvidesBoundaries | : | SET OF IfcRelSpaceBoundary FOR RelatedBuildingElement;
ConnectedFrom | : | SET OF IfcRelConnectsElements FOR RelatedElement;
ContainedInStructure | : | SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

| ENTITY IfcDistributionElement

| INVERSE

HasPorts | : | SET OF IfcRelConnectsPortToElement FOR RelatedElement;

| ENTITY IfcDistributionFlowElement

| INVERSE

| ENTITY IfcFlowController

| ENTITY IfcFlowMeter

PredefinedType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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