Modelica.Fluid.Sensors

Ideal sensor components to extract signals from a fluid connector

Information

Package Sensors consists of idealized sensor components that provide variables of a medium model and/or fluid ports as output signals. These signals can be, e.g., further processed with components of the Modelica.Blocks library. Also more realistic sensor models can be built, by further processing (e.g., by attaching block Modelica.Blocks.FirstOrder to model the time constant of the sensor).

For the thermodynamic state variables temperature, specific enthalpy, specific entropy and density the fluid library provides two different types of sensors: regular one port and two port sensors.

• The regular one port sensors have the advantage of easy introduction and removal from a model, as no connections have to be broken. A potential drawback is that the obtained value jumps as flow reverts.
• The two port sensors offer the advantages of an adjustable regularized step function around zero flow. Moreover the obtained result is restricted to the value flowing into port_a if allowFlowReversal is false.

Modelica.Fluid.Examples.Explanatory.MeasuringTemperature demonstrates the differences between one- and two-port sensor at hand of a simple example.

Extends from Modelica.Icons.SensorsPackage (Icon for packages containing sensors).

Package Content

Name	Description
Pressure	Ideal pressure sensor
Density	Ideal one port density sensor
DensityTwoPort	Ideal two port density sensor
Temperature	Ideal one port temperature sensor
TemperatureTwoPort	Ideal two port temperature sensor
SpecificEnthalpy	Ideal one port specific enthalpy sensor
SpecificEnthalpyTwoPort	Ideal two port sensor for the specific enthalpy
SpecificEntropy	Ideal one port specific entropy sensor
SpecificEntropyTwoPort	Ideal two port sensor for the specific entropy
MassFractions	Ideal one port mass fraction sensor
MassFractionsTwoPort	Ideal two port sensor for mass fraction
TraceSubstances	Ideal one port trace substances sensor
TraceSubstancesTwoPort	Ideal two port sensor for trace substance
MassFlowRate	Ideal sensor for mass flow rate
VolumeFlowRate	Ideal sensor for volume flow rate
RelativePressure	Ideal relative pressure sensor
RelativeTemperature	Ideal relative temperature sensor
BaseClasses	Base classes used in the Sensors package (only of interest to build new component models)

Modelica.Fluid.Sensors.Pressure

Ideal pressure sensor

Information

This component monitors the absolute pressure at its fluid port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.Density

Ideal one port density sensor

Information

This component monitors the density of the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.DensityTwoPort

Ideal two port density sensor

Information

This component monitors the density of the fluid flowing from port_a to port_b. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.Temperature

Ideal one port temperature sensor

Information

This component monitors the temperature of the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable).

Parameters

Connectors

Modelica.Fluid.Sensors.TemperatureTwoPort

Ideal two port temperature sensor

Information

This component monitors the temperature of the passing fluid. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties).

Parameters

Connectors

Modelica.Fluid.Sensors.SpecificEnthalpy

Ideal one port specific enthalpy sensor

Information

This component monitors the specific enthalpy of the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.SpecificEnthalpyTwoPort

Ideal two port sensor for the specific enthalpy

Information

This component monitors the specific enthalpy of a passing fluid. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.SpecificEntropy

Ideal one port specific entropy sensor

Information

This component monitors the specific entropy of the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.SpecificEntropyTwoPort

Ideal two port sensor for the specific entropy

Information

This component monitors the specific entropy of the passing fluid. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.MassFractions

Ideal one port mass fraction sensor

Information

This component monitors the mass fraction contained in the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Modelica.Fluid.Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.MassFractionsTwoPort

Ideal two port sensor for mass fraction

Information

This component monitors the mass fraction of the passing fluid. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Modelica.Fluid.Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.TraceSubstances

Ideal one port trace substances sensor

Information

This component monitors the trace substances contained in the fluid passing its port. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialAbsoluteSensor (Partial component to model a sensor that measures a potential variable), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.TraceSubstancesTwoPort

Ideal two port sensor for trace substance

Information

This component monitors the trace substance of the passing fluid. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.MassFlowRate

Ideal sensor for mass flow rate

Information

This component monitors the mass flow rate flowing from port_a to port_b. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.VolumeFlowRate

Ideal sensor for volume flow rate

Information

This component monitors the volume flow rate flowing from port_a to port_b. The sensor is ideal, i.e., it does not influence the fluid.

Extends from Sensors.BaseClasses.PartialFlowSensor (Partial component to model sensors that measure flow properties), Modelica.Icons.RoundSensor (Icon representing a round measurement device).

Parameters

Connectors

Modelica.Fluid.Sensors.RelativePressure

Ideal relative pressure sensor

Information

The relative pressure "port_a.p - port_b.p" is determined between the two ports of this component and is provided as output signal. The sensor should be connected in parallel with other equipment, no flow through the sensor is allowed.

Extends from Sensors.BaseClasses.PartialRelativeSensor (Partial component to model a sensor that measures the difference between two potential variables).

Parameters

Connectors

Modelica.Fluid.Sensors.RelativeTemperature

Ideal relative temperature sensor

Information

The relative temperature "T(port_a) - T(port_b)" is determined between the two ports of this component and is provided as output signal. The sensor should be connected in parallel with other equipment, no flow through the sensor is allowed.

Extends from Sensors.BaseClasses.PartialRelativeSensor (Partial component to model a sensor that measures the difference between two potential variables).

Parameters

Connectors