Emerson Process Management 2400S manual 8.14Configuring the enhanced density application, Name

Optional Configuration

For the temperature value to be used in CTL calculation, you can use the temperature data from the sensor, or you can configure external temperature compensation to use either a static temperature value or temperature data from an external temperature device.

•To use temperature data from the sensor, no action is required.

•To configure external temperature compensation, see Section 9.3.

8.14Configuring the enhanced density application

Micro Motion sensors provide direct measurements of density, but not of concentration. The enhanced density application calculates enhanced density process variables, such as concentration or density at reference temperature, from density process data, appropriately corrected for temperature.

Note: For a detailed description of the enhanced density application, see the manual entitled

Micro Motion Enhanced Density Application: Theory, Configuration, and Use.

Note: The enhanced density application requires liquid volume measurement units. If you plan to use enhanced density process variables, ensure that liquid volume flow measurement is specified. See Section 8.2.

8.14.1About the enhanced density application

The enhanced density calculation calculation requires an enhanced density curve, which specifies the relationship between temperature, concentration, and density for the process fluid being measured. Micro Motion supplies a set of six standard enhanced density curves (see Table 8-16). 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 enhanced density process variables (see Table 8-17). The available enhanced density 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 an enhanced density 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 8-17.

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 8-16Standard curves and associated measurement units

Name	Description	Density unit	Temperature unit
Deg Balling	Curve represents percent extract, by mass, in	g/cm3	°F
	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.
Deg Brix	Curve represents a hydrometer scale for sucrose	g/cm3	°C
	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.
Deg Plato	Curve represents percent extract, by mass, in	g/cm3	°F
	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.

78 Micro Motion® Model 2400S Transmitters for DeviceNet™