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    Component 30: Difference meter
    In This Topic

     


    Component 30: Difference Meter


    Specifications

    Line connections

    1

    Measured value (1)

    2

    Measured value (2)

    3

    Measurement value difference (1)-(2)

     

    General       User Input Values       Physics Used       Displays       Example

     

    General

    This module belongs to the "measuring" components. These are characterized by lines that exit their connections and are not connected to other connection points of other components. Their endings have to take data from lines they are connected to. The connection lines can be compared with the measuring cables of a measuring instrument that end in sensors to measure a physical value of another line.

    The measured values can be:

     

    Caution:

    Module 30 measures the difference between data at line connection 1 and line connection 2, i.e. V1-V2. This may be a negative value. If a negative difference is measured with a heat flow, the value can not be shown. In this case it is best to mirror the symbol, i.e. to change 1 and 2. Thus, the difference at the line ends becomes positive and can be seen.


    User Input Values

     

    FTYP

    Flag for the type of measurement value 

    Like in Parent Profile (Sub Profile option only)

    Expression

    =1: Pressure difference

    =2: Temperature difference

    =3: Enthalpy difference

    =4: Mass flow

    =5: Power/heat flow difference 

    FSPEC

    Handling of negative result 

    Like in Parent Profile (Sub Profile option only)

    Expression

    =0: negatives result is forwarded

    =1: negatives result is changed to 0 

    Generally, all inputs that are visible are required. But, often default values are provided.

    For more information on colour of the input fields and their descriptions see Edit Component\Specification values

    For more information on design vs. off-design and nominal values see General\Accept Nominal values


    Physics Used

    Equations

    All cases

     

     

    V3 = V1-V2

     

     

     

    V: Value

     


    Component Displays

    Display Option 1

    Example

    Click here >> Component 30 Demo << to load an example.

    See Also