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Configuration and Use Manual 59
Configuration
Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin
4.7 Configuring the concentration measurement application
Micro Motion sensors provide direct measurements of density, but not of concentration. The
concentration measurement application calculates process variables such as concentration or density
at reference temperature, using density process data appropriately corrected for temperature.
Note: For a detailed description of the concentration measurement application, see the manual
entitled Micro Motion Enhanced Density Application: Theory, Configuration, and Use.
Note: The concentration measurement application requires liquid volume measurement units. If you
plan to use concentration measurement process variables, ensure that liquid volume flow
measurement is specified. See Section 4.4.
4.7.1 About the concentration measurement application
The concentration measurement calculation requires a concentration measurement curve, which
specifies the relationship between temperature, concentration, and density for the process fluid being
measured. Micro Motion supplies a set of six standard concentration measurement curves (see
Table 4-10). If none of these curves is appropriate for your process fluid, you can configure a custom
curve or purchase a custom curve from Micro Motion.
The derived variable, specified during configuration, controls the type of concentration measurement
that will be produced. Each derived variable allows the calculation of a subset of concentration
measurement process variables (see Table 4-11). The available concentration measurement process
variables can be used in process control, just as mass flow rate, volume flow rate, and other process
variables are used. For example, an event can be defined on a concentration measurement process
variable.
• For all standard curves, the derived variable is Mass Conc (Dens).
• For custom curves, the derived variable may be any of the variables listed in Table 4-11.
The transmitter can hold up to six curves at any given time, but only one curve can be active (used for
measurement) at a time. All curves that are in transmitter memory must use the same derived variable.
Table 4-10 Standard curves and associated measurement units
Name Description Density unit Temperature unit
Deg Balling Curve represents percent extract, by mass, in
solution, based on °Balling. For example, if a wort
is 10 °Balling and the extract in solution is 100%
sucrose, the extract is 10% of the total mass.
g/cm
3
°F
Deg Brix Curve represents a hydrometer scale for sucrose
solutions that indicates the percent by mass of
sucrose in solution at a given temperature. For
example, 40 kg of sucrose mixed with 60 kg of
water results in a 40 °Brix solution.
g/cm
3
°C
Deg Plato Curve represents percent extract, by mass, in
solution, based on °Plato. For example, if a wort is
10 °Plato and the extract in solution is 100%
sucrose, the extract is 10% of the total mass.
g/cm
3
°F