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Pressure Transducer

Model generic pressure transducer that turns pressure measurement into voltage

Library

Sensors

Description

The Pressure Transducer block models a generic pressure transducer that turns a pressure measurement into a voltage. The output voltage is linearly proportional to the pressure, and the block outputs zero volts if the pressure is less than zero. An input pressure equal to the Pressure range parameter value results in an output voltage equal to the Full-scale deflection parameter value. For higher pressures, the output voltage remains at this Full-scale deflection value.

You have three choices of operation mode, which let you select between vacuum, atmospheric pressure, or sealed-gauge reference pressure as the reference point for the pressure measurement.

Optionally, if you set the Dynamics parameter to Model transducer bandwidth, then the dynamics of the sensor are approximated by a first-order lag. The lag is determined by the Bandwidth parameter. If you select this option, you must also specify an initial condition for the lag by using the Initial pressure parameter.

If running your simulation with a fixed-step solver, or generating code for hardware-in-the-loop testing, MathWorks recommends that you set the Dynamics parameter to No dynamics — Suitable for HIL, because this avoids the need for a small simulation time step if the sensor bandwidth is high.

Dialog Box and Parameters

Pressure range

The maximum pressure that the sensor can measure. The default value is 1e6 Pa.

Operation mode

Select one of the following options to define the reference point for the pressure measurement:

  • Absolute — The pressure measurement is with respect to zero absolute pressure, that is, vacuum. This is the default option.

  • Gauge — The pressure measurement is with respect to atmospheric pressure. Atmospheric pressure is defined by the Gas Properties block in the Simscape™ Foundation library.

  • Sealed-Gauge — The pressure measurement is referenced to an internal sealed chamber. If you select this option, use the Reference pressure parameter to specify the reference point for pressure measurement.

Reference pressure

The reference pressure in the internal sealed chamber. This parameter is only visible when you select Sealed-Gauge for the Operation mode parameter. The default value is 1.01325e5 Pa.

Full-scape deflection

The output voltage when the measured pressure is equal to, or greater than, the Pressure range parameter value. The default value is 5 V.

Output resistance

The output resistance of the transducer. The default value is 200 Ω.

Dynamics

Select one of the following options for modeling sensor dynamics:

  • No dynamics — Suitable for HIL — Do not model sensor dynamics. Use this option when running your simulation fixed step or generating code for hardware-in-the-loop testing, because this avoids the need for a small simulation time step if the sensor bandwidth is high. This is the default option.

  • Model transducer bandwidth — Model sensor dynamics with a first-order lag approximation, based on the Bandwidth and the Initial pressure parameter values.

Bandwidth

Determines the value of the sensor lag. This parameter is only visible when you select Model transducer bandwidth for the Dynamics parameter. The default value is 5 kHz.

Initial pressure

Determines the initial condition for the lag. This parameter is only visible when you select Model transducer bandwidth for the Dynamics parameter. The default value is 0 Pa.

Ports

The block has the following ports:

A

Pneumatic port

+

Positive electrical port

-

Negative electrical port

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