Measurement Selector (MA)

Access to measured values of pressure, temperature, humidity and the amount of impurity gases in the final volume with moist air.

blockType: AcausalFoundation.MoistAir.Sensors.MeasurementSelector

Path in the library:

/Physical Modeling/Fundamental/Moist Air/Sensors/Measurement Selector (MA)

Description

The Measurement Selector (MA) unit allows access to measurements of pressure, temperature, humidity and the amount of impurity gases inside the unit with a finite volume of moist air. There is no mass or energy flow through the sensor.

Finite volume wet air blocks, i.e. Constant Volume Chamber (MA), Pipe (MA), Rotational Mechanical Converter (MA) and Translational Mechanical Converter (MA), contain an internal node that represents the volume of wet air within the component. Conventional sensors cannot connect to this internal node. Therefore, each of the final moist air volume units has a F signal output port that outputs a vector signal containing measurements of pressure (in Pa), temperature (in K), humidity level, and the amount of impurity gases inside the component.

The Measurement Selector (MA) block is used for vector signal separation and unit conversion (for pressure and temperature). To access the measurement results, connect the F input port F of the Measurement Selector (MA) block to the F signal output port F of the wet air final internal volume block.

Ports

Input

# F — signal containing the results of measurements of pressure, temperature, humidity and amount of impurity gases
`vector'

Details

Connect this port to the F signal output port of a unit with a finite internal volume of moist air to access measurement results.

Humid air final volume units have a F signal output port that outputs a vector signal containing the results of pressure, temperature, humidity, and impurity gas measurements inside the component. The Measurement Selector (MA) unit is used to separate this vector signal.

Data types	`Float64`.
Complex numbers support	No

Output

# P — pressure, Pa
scalar

Details

Output port for pressure measurement.

Data types	`Float64`.
Complex numbers support	No

# T — temperature, K
scalar

Details

Output port for temperature measurement.

Data types	`Float64`.
Complex numbers support	No

# W — humidity
scalar

Details

Output port for measuring humidity. The measurement method is set by the parameters Measured moisture specification.

Data types	`Float64`.
Complex numbers support	No

# G — gas level
scalar

Details

Output port for measuring the amount of impurity gases. The measurement method is set by the parameters Measured trace gas specification.

Data types	`Float64`
Complex numbers support	No

Parameters

# Measured moisture specification — moisture measurement method
Relative humidity | Specific humidity | Water vapor mole fraction | Humidity ratio

Details

Sets the measurement method:

Relative humidity - scalar signal at port W equals relative humidity.
Specific humidity - scalar signal on the W port equals specific humidity.
Water vapor mole fraction - scalar signal on the W port is equal to molar fraction of humidity.
Humidity ratio - scalar signal on the W port is equal to the humidity coefficient.

Values	`Relative humidity` \| `Specific humidity` \| `Water vapor mole fraction` \| `Humidity ratio`
Default value	`Relative humidity`
Program usage name	`moisture_type`
Evaluatable	No

# Measured trace gas specification — method of measuring the amount of impurity gases
Mass fraction | Mole fraction

Details

Sets the measurement method:

Mass fraction - scalar signal at port G equals the mass fraction of impurity gases.
Mole fraction - scalar signal on the G port equals the molar fraction of impurity gases.

Values	`Mass fraction` \| `Mole fraction`
Default value	`Mass fraction`
Program usage name	`trace_gas_type`
Evaluatable	No