39
Reference Manual
00809-0100-4803, Rev GA
Configuration
September 2017
Configuration
Note
If the flow 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 24.
Follow these steps to configure a custom unit:
a. Custom Unit: Enter the desired custom unit label to be displayed for the flow 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 display will show 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 display. 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 Rosemount 3051SMV uses the following convention:
Base per Custom =
Example
Custom Unit: kg
Base Unit: g
Because:
1 kg (Kilogram) = 1000 g (Grams)
Base per Custom = = = 1000
The values of Base per Custom for common flow units are shown in Tab le 2 -9 .
d. Select Apply.
e. Flow Rate Unit: From the drop-down menu, select the custom unit that was created in Step b.
Note
The custom unit may not be available as a selection in the Flow Rate Unit drop-down menu until the
drop-down menu is refreshed. To refresh the drop-down menu, navigate to the Basic Setup tab and then
return to the Variables - Flow tab.
Table 2-9. Common Custom Units - Flow
Custom unit Base unit Base per custom
Barrels per Minute (BBL/M) bbl/h 60
Cubic Meters per Day (CUM/D) Cum/h 0.041667
Millions of Cubic Meters per Day (MMCMD) Cum/h 41666.7
Number of Base Units
1xCustomxUnit
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Number of Base Units
1xCustomxUnit
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1000 g⋅
1kg⋅
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