28
Reference Manual
00809-0100-4804, Rev CB
Configuration
November 2016
Configuration
3.4.4 Variable mapping
Select which ERS System 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 System parameters can be assigned to the Primary Variable:
Differential Pressure
P
HI
Pressure
P
LO
Pressure
Scaled Variable
2
nd
, 3
rd
, and 4
th
variables
The 2
nd
, 3
rd
, and 4
th
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 an
Emerson Smart Wireless THUM
™
Adapter. The following ERS System parameters can be assigned to the
2
nd
, 3
rd
, and 4
th
variables:
Differential Pressure
P
HI
Pressure
P
LO
Pressure
P
HI
Module Temperature
P
LO
Module Temperature
Scaled Variable
3.4.5 Analog output
Configure the lower and upper range values, which correspond to the 4 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 Rosemount 3051S 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
HI
transmitter.
2. Push and hold the zero adjustment button for at least two seconds but no longer than 10 seconds.
3. Apply a pressure equivalent to the upper range value to the P
HI
transmitter.
4. Push and hold the span adjustment button for at least two seconds but no longer than 10 seconds.
Fast Keys
2, 1, 1, 3
Fast Keys
2, 1, 1, 4
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