Emerson Rosemount 3051S Reference Manual page 36

Rosemount 3051S ERS System
Variable Mapping
2, 1, 1, 3
Fast Keys
Analog Output
2, 1, 1, 4
Fast Keys
3-4
Select which ERS parameters to assign to each HART variable.
Primary Variable
The parameter assigned to the HART Primary Variable controls the 4-20 mA
Analog Output. The following ERS parameters can be assigned to the
Primary Variable:
• Differential Pressure
• P Pressure
HI
• P Pressure
LO
• Scaled Variable
nd rd th
2 , 3 , and 4 Variables
nd rd th
The 2 , 3 , and 4 Variables can be accessed digitally through a HART host.
A HART-to-Analog converter, such as the Rosemount 333 Tri-Loop, can also
be used to convert each of the variables to a separate 4-20 mA analog output
signal. These variables can also be accessed wirelessly by using a 775
SmartWireless THUM Adapter. The following ERS parameters can be
assigned to the 2nd, 3rd, and 4th Variables:
• Differential Pressure
• P Pressure
HI
• P Pressure
LO
• P Module Temperature
HI
• P Module Temperature
LO
• Scaled Variable
Configure the Lower and Upper Range Values, which correspond to the 4 mA
and 20 mA Analog Output range points. The 4 mA point represents the 0% of
span reading, and the 20 mA point represents the 100% of span reading.
The Analog Output range points can also be set using the Zero and Span
adjustment buttons located on the electronics of the ERS Primary Transmitter
(see Figure 3-1) and a pressure source.
1. Using a pressure source with an accuracy three to ten times the desired
calibrated accuracy, apply a pressure equivalent to the lower range value
to the P transmitter.
HI
2. Push and hold the zero adjustment button for at least two seconds but no
longer than ten seconds.
3. Apply a pressure equivalent to the upper range value to the P
transmitter.
4. Push and hold the span adjustment button for at least two seconds but
no longer than ten seconds.
Reference Manual
00809-0100-4804, Rev AA
January 2011
HI