Measurement Selector (MA)
Access to measured values of pressure, temperature, humidity and the amount of impurity gases in the final volume with moist air.
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Description
The Measurement Selector (MA) unit allows access to measurements of pressure, temperature, humidity and the amount of impurity gases within the unit with a finite volume of moist air. There is no mass or energy flow through the sensor.
Wet air finite volume units, i.e. Constant Volume Chamber (MA), Pipe (MA), Rotational Mechanical Converter (MA) and Translational Mechanical Converter (MA), contain an internal assembly 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 to separate the vector signal and convert the units of measurement (for pressure and temperature). To access the measurement results, connect the F input port F of the Measurement Selector (MA) to the F signal output port of the unit with the final internal volume of moist air.
Ports
Input
F - signal containing the results of measurements of pressure, temperature, humidity and amount of impurity gases
vector
Connect this port to the F signal output port of a unit with a finite internal volume of moist air to access the measurement results.
Units with a finite volume of moist air have an F signal output port that outputs a vector signal containing the results of measurements of pressure, temperature, humidity, and the amount of impurity gases inside the component. The Measurement Selector (MA) unit is used to separate this vector signal.
Output
P - pressure, Pa
scalar
Output port for pressure measurement.
T - temperature, K
scalar
Output port for temperature measurement.
W - humidity
scalar
Signal output port for moisture measurement. The measurement method is set by the parameter Measured moisture specification.
G - gas level
scalar
Signal output port for measuring the amount of impurity gases. The measurement method is set by the parameter Measured trace gas specification.
Parameters
Measured trace moisture specification - method of moisture measurement
Relative humidity (by default) | Specific humidity | Water vapor mole fraction | Humidity ratio
Specifies the method of measurement:
-
Relative humidity- scalar signal on the W port equals relative humidity. -
Specific humidity- scalar signal on the W port equals specific humidity. -
Water vapor mole fraction- scalar signal on the W port equals molar fraction of humidity. -
Humidity ratio- scalar signal on the W port is equal to the humidity ratio.
*Measured trace gas specification - method of measuring the amount of impurity gases
Mass fraction (by default) | Mole fraction.
Sets the measurement method:
-
Mass fraction- scalar signal on the G port equals the mass fraction of impurity gases. -
Mole fraction- scalar signal on the G port equals the molar fraction of impurity gases.
Block parameter |
NumDelays |
|
Type |
character vector |
|
Values |
Positive scalar |
-1 (inherited) |
By default |
4 |
|