Emerson Rosemount 3051 Reference Manual page 29

Reference Manual
00809-0100-4007
Configure process alarts using AMS Device Manager
Complete the following steps to configure process alerts with AMS Device Manager.
Procedure
1. Right-click the device and select Configure.
2. Select Guided Setup.
3. Select the Process Alerts button.
4. Follow screen prompts to configure process alerts.
2.9.3 Configuring scaled variable
With the scaled variable configuration, you can create a relationship/conversion between
the pressure units and user-defined/custom units. There are two use cases for a scaled
variable. The first is to allow custom units to be displayed on the transmitter's LOI/LCD
display. The second is to allow custom units to drive the transmitter's 4-20 mA output.
If you desire custom units to drive the 4-20 mA output, you must remap scaled variable as
the primary variable. Refer to
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.
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• 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.
• Low flow cutoff: 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.
Configure scaled variable using a Field Communicator
Complete the following steps to configure a scaled variable with a Field Communicator.
Procedure
1. From the HOME screen, enter the Fast Key sequence.
Reference Manual
Re-mapping device
Linear
Square root
variables.
Configuration
August 2019
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