Pressure Sensor (IL)

Measure pressure differences, absolute pressure, or gauge pressure

Since R2020a

• 

Libraries:
Simscape / Foundation Library / Isothermal Liquid / Sensors

Description

The Pressure Sensor (IL) block represents an ideal sensor that measures pressure in an isothermal liquid network. There is no mass flow through the sensor.

The Pressure Measurements parameter controls the measurement type and sensor configuration:

• Pressure difference — The physical signal port P reports the pressure difference across the sensor:

  $$P=p_A-p_B,$$

  where p_A and p_B are pressures at the sensor ports. The measurement is positive when the value at port A is greater than the value at port B.

• Absolute pressure — The physical signal port Pa reports the absolute pressure at port A:

  $$Pa=p_A,$$

  where p_A is pressure at port A, measured with respect to absolute zero. In this configuration, the sensor has only one isothermal liquid port.

• Gauge pressure — The physical signal port Pg reports the gauge pressure at port A:

  $$Pg=p_A-p_{atm},$$

  where p_A is pressure at port A, measured with respect to absolute zero, and p_atm is the atmospheric pressure specified by the Isothermal Liquid Properties (IL) block connected to the circuit. In this configuration, the sensor has only one isothermal liquid port.

The block icon changes depending on the value of the Pressure Measurements parameter.

Pressure Measurements	Block Icon
Pressure difference
Absolute pressure
Gauge pressure

Ports

Output

P — Pressure difference measurement, Pa

physical signal

Physical signal output port for the pressure difference measurement.

Dependencies

This port is visible if you set the Pressure Measurements parameter to Pressure difference.

Pa — Absolute pressure measurement, Pa

physical signal

Physical signal output port for the absolute pressure measurement.

Dependencies

This port is visible if you set the Pressure Measurements parameter to Absolute pressure.

Pg — Gauge pressure measurement, Pa

physical signal

Physical signal output port for the gauge pressure measurement.

Dependencies

This port is visible if you set the Pressure Measurements parameter to Gauge pressure.

Conserving

A — Sensor inlet

isothermal liquid

Isothermal liquid conserving port.

B — Sensor outlet

isothermal liquid

Isothermal liquid conserving port.

Dependencies

This port is visible if you set the Pressure Measurements parameter to Pressure difference.

Parameters

Pressure Measurements — Select whether the sensor measures pressure difference, absolute pressure, or gauge pressure

Pressure difference (default) | Absolute pressure | Gauge pressure

Select the type of measurements:

• Pressure difference — The sensors measures the pressure difference across the sensor. Selecting this option exposes the physical signal output port P and the second isothermal liquid port B. The measurement is positive when the value at port A is greater than the value at port B.

• Absolute pressure — The sensors measures the absolute pressure at port A. Selecting this option exposes the physical signal output port Pa.

• Gauge pressure — The sensors measures the gauge pressure at port A. Selecting this option exposes the physical signal output port Pg.

Extended Capabilities

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

Version History

Introduced in R2020a