ph_sensor Class Reference [DSim Models]

A simple model of a pH sensor. More...

#include <ph_sensor.h>

List of all members.

Public Member Functions
	ph_sensor (dsim_model_setup *setup)
void	initialize_data ()
	Initialize parameters and the PH output.
void	initialization_complete ()
void	initialize_timestep ()
Protected Attributes
dsim_variable	pK1_dsim
	Acid stream 1.
dsim_variable	pK2_dsim
	Acid stream 2.
dsim_variable	wA4_dsim
	Acid stream 4.
dsim_variable	wB4_dsim
	Base stream 4.
dsim_variable	pH_dsim
	Measured pH.

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Detailed Description

A simple model of a pH sensor.

This sensor does not have a closed form equation for the output.

Reference: Henson, M. A. and D. E. Seborg. (1997.) Nonlinear Process Control Prentice-Hall. pp. 207-210.

Definition at line 26 of file ph_sensor.h.

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Member Function Documentation

void ph_sensor::initialization_complete

(

)

Finish initialization. Request the wA4 and wB4 variables from the process model.

Definition at line 49 of file ph_sensor.cc.

{
    wA4_dsim    = parent()->request_local_variable("wA4");
    wB4_dsim    = parent()->request_local_variable("wB4");
}

void ph_sensor::initialize_timestep

(

)

Compute the output of the sensor prior to integration. The PH is computed here from the parameters.

Definition at line 59 of file ph_sensor.cc.

{
    // Get values of dsim variables
    double wA4 = wA4_dsim.value_as_double();
    double wB4 = wB4_dsim.value_as_double();
    double pK1 = pK1_dsim.value_as_double();
    double pK2 = pK2_dsim.value_as_double();
    
    // Compute the ph output value
    double pH = compute_ph( wA4, wB4, pK1, pK2 );
    
    // Set the output variable    
    pH_dsim.set_value_as_double(pH);
}

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The documentation for this class was generated from the following files:

• ph_sensor.h
• ph_sensor.cc