Emerson 3051S Dokumentacja Strona 75

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Reference Manual
00809-0100-4803, Rev DA
Section 3: Configuration
April 2013
Configuration
3.7.2 Energy rate
(Fully Compensated Mass and Energy Flow Feature Board only):
Note
Energy Rate calculations are only available for certain fluid types.
The Energy tab allows the user to configure the settings associated with the energy flow.
1. Under the Energy Rate Setup heading, edit the Energy Rate Units and Damping values as
needed. The energy rate calculation within the device uses undamped process
variables. Energy rate damping is set independently of flow rate damping and measured
process variables.
2.Under the Custom Units Setup heading, the user may configure a custom unit for the energy
rate measurement. Custom units allow the energy rate to be displayed in units of
measure that are not standard in the 3051S MultiVariable.
Note
If the energy rate is configured as the primary variable and is being output via the 4-20 mA
signal, verify the 4-20 mA range (LRV and URV) after completing the custom unit configuration.
For more information on verifying the 4-20 mA range, see “Basic device configuration” on
page 31.
Follow these steps to configure a custom unit:
a. Custom Unit: Enter the desired custom unit label to be displayed for the energy rate. Up
to five characters including letters, numbers, and symbols can be entered in the
custom unit field.
Note
It is recommended that the Custom Unit be entered in upper case letters. If lower case letters
are entered, the LCD will display upper case letters. Additionally, the following special
characters are recognized by the LCD Display: hyphens (“-”), percent symbols (“%”), asterisks
(“*”), forward slashes (“/”) and spaces. Any other character entered for the Custom Unit will be
displayed as an asterisk (“*”) on the LCD Display. The following warning will be returned
indicating these changes: “Custom Unit contains characters that will display in upper case or
asterisks on LCD. The DCS will display as entered.
b. Base Unit: From the drop-down menu, select a base unit to be used for the custom unit
relationship.
c. Base per Custom: Enter a numeric value that represents the number of base units per
one custom unit. The 3051S MultiVariable transmitter uses the following convention:
Base per Custom =
Mass and Energy Flow Fast Keys 1, 4, 1, 2
Number of Base Units
1xCustomxUnit
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