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)

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.