Emerson Rosemount 2051 Reference Manual page 26

Configuration
February 2024
variable. The first is to allow custom units to be displayed on the transmitter's local
operator interface (LOI)/LCD display. The second is to allow custom units to drive the
transmitter's 4-20 mA (1-5 Vdc) output.
If you desire custom units to drive the 4-20 mA (1-5 Vdc) output, remap the scaled variable
as the primary variable.
The scaled variable configuration defines the following items:
Scaled variable
units
Scaled data
options
Pressure value
position 1
Scaled variable
value position 1
Pressure value
position 2
Scaled variable
value position 2
Linear offset
Low flow cutoff
Related information
Re-mapping device variables
Configure scaled variable using a communication device
Procedure
1. From the HOME screen, enter the fast key sequence:
2. Follow the screen prompts to configure scaled variable.
Configure scaled variable using AMS Device Manager
Procedure
1. Right-click the device and select Configure.
2. Select the Scaled Variable tab and select the Scaled Variable button.
3. Follow screen prompts to configure the scaled variable.
26
Custom units to be displayed
Defines the transfer function for the application:
• Linear
• Square root
Lower known value point with consideration of linear offset
Custom unit equivalent to the lower known value point
Upper known value point
Custom unit equivalent to the upper known value point
The value required to zero out pressures effecting the desired pressure
reading
Point at which output is driven to zero to prevent problems cause by
process noise. Emerson highly recommends using the low flow cut off
function in order to have a stable output and avoid problems due to
process noise at a low flow or no flow condition. Enter a low flow cutoff
value that is practical for the flow element in the application.
2, 1, 5, 7
Fast keys
• When configuring for level, select
• When configuring for flow, select
options.
under Select Scaled data options.
Linear
under Select Scaled data
Square Root
Reference Manual
00809-0100-4107
Rosemount 2051