Emerson Rosemount 3051P, Reference Manual, Page: 29 / 110

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Reference Manual
00809-0700-4001, Rev AA
Configuration
May 2017
Configuration
Figure 2-13. Configuring Alarm and Saturation with LOI
2.10.2 Configuring scaled variable
The Scaled Variable configuration allows the user to create a relationship/conversion between the
pressure units and user-defined/custom units. There are two use cases for Scaled Variable. The first use
case is to allow custom units to be displayed on the transmitter's LCD/LOI Display. The second use case is
to allow custom units to drive the transmitter's 4–20 mA output.
If the user desires custom units to drive the 4–20 mA output, Scaled Variable must be re-mapped as the
primary variable. Refer to
“Re-mapping device variables” on page 20 .
The Scaled Variable configuration defines the following items:

Scaled Variable units - Custom units to be displayed.

Scaled data options - Defines the transfer function for the application

Pressure value position 1 - Lower known value point with consideration of linear offset.

Scaled Variable value position 1 - Custom unit equivalent to the lower known value point.

Pressure value position 2 - Upper known value point

Scaled Variable value position 2 - Custom unit equivalent to the upper known value point

Linear offset - The value required to zero out pressures effecting the desired pressure reading.
Using a scaled variable using a Field Communicator
1. Follow the screen prompts to configure scaled variable.
a. Select Linear under Select Scaled data options .
Using a scaled variable using AMS Device Manager
1. Right click on the device and, select Configure .
2. Select the Scaled Variable tab and select the Scaled Variable button.
3. Follow screen prompts to configure scaled variable.
a. Select Linear under Select Scaled data options .
Using a scaled variable using a LOI
Refer to Figure 2-14 on page 20 for instructions to configure Scaled Variable using a LOI.
From the HOME screen, enter the Fast Key sequence
Device Dashboard Fast Keys
2, 1, 4, 7
EXTENDED MENU
CALIBRAT
DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU
ALARM SAT VALUES
ROSEMOUNT VALUES
NAMUR VALUES
OTHER VALUES
BACK TO MENU
EXIT MENU
VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU EXTENDED MENU
EXIT MENU