Defined in File Ifc4.h
IfcFlowInstrument: public Ifc4::IfcDistributionControlElement¶
A flow instrument reads and displays the value of a particular property of a system at a point, or displays the difference in the value of a property between two points. Instrumentation is typically for the purpose of determining the value of the property at a point in time. It is not the purpose of an instrument to record or integrate the values over time (although they may be connected to recording devices that do perform such a function). This entity provides for all forms of mechanical flow instrument (thermometers, pressure gauges etc.) and electrical flow instruments (ammeters, voltmeters etc.)
HISTORY New entity in IFC2x4
Type Use Definition IfcFlowInstrument defines the occurrence of any flow instrument; common information about flow instrument types is handled by IfcFlowInstrumentType. The IfcFlowInstrumentType (if present) may establish the common type name, usage (predefined type), properties, materials, ports, composition, assignments, and representations. The IfcFlowInstrumentType is attached using the IfcRelDefinesByType objectified relationship and is accessible by the IsTypedBy inverse attribute. If the IfcFlowInstrumentType has ports or aggregated elements, such objects are reflected at the IfcFlowInstrument occurrence using the IfcRelDefinesByObject relationship.
Property Use Definition The property sets relating to this entity are defined by IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. Property sets may also be specified at the IfcFlowInstrumentType, defining the common property data for all occurrences of the same type. They are then accessible by the IsTypedBy inverse attribute pointing to IfcFlowInstrumentType.HasPropertySets. If both are given, then the properties directly defined at IfcFlowInstrument override the properties defined at IfcFlowInstrumentType. Refer to the documentation at the supertype IfcDistributionControlElement and ancestors for inherited property set definitions. The following property set definitions are applicable to this entity: (All Types)
Pset_FlowInstrumentPHistory (PSET_PERFORMANCEDRIVEN) Pset_FlowInstrumentTypeCommon (PSET_TYPEDRIVENOVERRIDE)
Quantity Use Definition The quantities relating to this entity are defined by IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. The following base quantities are defined and shall be exchanged with the IfcElementQuantity.Name = ‘BaseQuantities’. Other quantities, being subjected to local standard of measurement, may be defined with another string value assigned to Name. In this case a valid value for MethodOfMeasurement shall be provided.
Material Use Definition The material of the IfcFlowInstrument is defined by IfcMaterialConstituentSet or as a fallback by IfcMaterial, and attached by the RelatingMaterial attribute on the IfcRelAssociatesMaterial relationship. It is accessible by the HasAssociations inverse attribute. Material information can also be given at the IfcFlowInstrumentType, defining the common attribute data for all occurrences of the same type. The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:
Casing: Material from which the casing is constructed.
Port Use Definition The distribution ports relating to the IfcFlowInstrument are defined by IfcDistributionPort and attached by the IfcRelConnectsPortToElement relationship. If the flow instrument occurrence is defined by IfcFlowInstrumentType, then the port occurrences must reflect those defined at the IfcFlowInstrumentType using the IfcRelDefinesByObject relationship. Ports are specific to the IfcFlowInstrument PredefinedType as follows indicated by the IfcDistributionPort Name, PredefinedType, and FlowDirection:
Input (SIGNAL, SINK): Receives signal.
Whether the optional attribute PredefinedType is defined for this IfcFlowInstrument.
IfcFlowInstrument(std::string v1_GlobalId, ::Ifc4::IfcOwnerHistory *v2_OwnerHistory, boost::optional<std::string> v3_Name, boost::optional<std::string> v4_Description, boost::optional<std::string> v5_ObjectType, ::Ifc4::IfcObjectPlacement *v6_ObjectPlacement, ::Ifc4::IfcProductRepresentation *v7_Representation, boost::optional<std::string> v8_Tag, boost::optional<::Ifc4::IfcFlowInstrumentTypeEnum::Value> v9_PredefinedType)¶