Emerson MICRO MOTION 2700 Manual de Instalação descarregar pdf (Página 176)

166 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters

Configuring the Enhanced Density Application continued

If the standard curves are not appropriate for your application, you did not purchase the custom

curves, and you require transmitter output based on enhanced density, you must configure one or

more curves to meet your application requirements.

D.4 About enhanced density

The enhanced density application allows you to select or configure process density curves for

proprietary fluids. These curves represent the change in density that results from changes in process

temperature and process concentration.

D.4.1 The density curve

The density curve can be represented as a surface in three-dimensional space. See Figure D-1.

Up to six curves may be stored in the transmitter; however, only one curve can be enabled (in use) at a

time. When a density curve is enabled, the transmitter uses the selected curve and measured process

temperature and density to calculate the derived variable. The derived variable is used to calculate

several enhanced density process variables, such as ED Density at Ref or ED Concentration. These

process variables can be used in transmitter operation just like any standard process variable such as

mass flow or volume flow; for example, they can be used to define an event.

Table D-1 Standard curves

Name Description

Deg Balling Curve represents percent extract, by weight, 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 weight.

Deg Brix Curve represents a hydrometer scale for sucrose solutions that indicates the percent by weight 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 weight, 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 weight.

HFCS 42 Curve represents a hydrometer scale for HFCS 42 (high fructose corn syrup) solutions that indicates

the percent by weight of HFCS in solution.

HFCS 55 Curve represents a hydrometer scale for HFCS 55 (high fructose corn syrup) solutions that indicates

the percent by weight of HFCS in solution.

HFCS 90 Curve represents a hydrometer scale for HFCS 90 (high fructose corn syrup) solutions that indicates

the percent by weight of HFCS in solution.

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