WOLFRAM SYSTEMMODELER

Sensors

Ideal sensor components to extract signals from a fluid connector

Package Contents

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)

Information

This information is part of the Modelica Standard Library maintained by the Modelica Association.

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.

Wolfram Language

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