Absolute Reference (2P)

R2026b

(Not recommended) Reference point at zero absolute pressure and specific internal energy

Using this block is no longer recommended. Instead, make absolute measurements by setting the Measurement reference parameter of the Pressure & Temperature Sensor (2P) block to Absolute. (since R2023a)

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Absolute Reference (2P) block

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Libraries:
Simscape / Foundation Library / Two-Phase Fluid / Elements

Description

The Absolute Reference (2P) block represents a reference point at zero absolute pressure and specific internal energy. Use with the Pressure & Internal Energy Sensor (2P) block to measure the absolute pressure and specific internal energy at a two-phase fluid node.

Ports

Conserving

A — Pressure and specific internal energy are zero

two-phase fluid

Two-phase fluid conserving port where the pressure and specific internal energy are equal to zero.

Programmatic Use

Port: A

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"fl_lib/Two-Phase Fluid/Elements/Absolute Reference (2P)"

Example: add_block("fl_lib/Two-Phase Fluid/Elements/Absolute Reference (2P)","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2015b

R2023a: Absolute Reference (2P) block no longer recommended

The Pressure & Temperature Sensor (2P) block now contains an implicit reference node, which means that you need only one port to make absolute measurements of pressure or temperature. Expose the second port only if you need to measure the difference in pressure or temperature between two nodes in the model.

In previous releases, to measure the absolute pressure and absolute temperature at port A, you needed to connect port B to an Absolute Reference (2P) block. This is no longer necessary because you can now make absolute measurements by setting the Measurement reference parameter of the Pressure & Temperature Sensor (2P) block to Absolute.

This change has no compatibility impact. Existing models that have an Absolute Reference (2P) block connected to a Pressure & Temperature Sensor (2P) block continue to work as before.