37
Reference Manual
00809-0100-4804, Rev CB
Configuration
November 2016
Configuration
3.5.5 Module assignments
The ERS System calculates DP by taking the pressure measurement from the P
HI
transmitter and
subtracting the pressure measurement from the P
LO
transmitter.
Rosemount 3051S ERS Transmitters are shipped from the factory preconfigured so the primary sensor
(4–20 loop termination and optional LCD display) is assigned as the P
HI
device, and the secondary sensor
(junction box housing) is assigned as the P
LO
device. In installations where the primary transmitter is
installed on the P
LO
process connection (such as at the top of a tank), these designations may be
switched electronically using a Field Communicator.
Change the P
HI
and P
LO
module assignments
1. View the neck label on each Rosemount 3051S ERS Transmitter and note the serial number and
pressure location (P
HI
vs. P
LO
) of the transmitter.
2. Using a Field Communicator, view the serial number and the assigned pressure location for either
“Module 1” or “Module 2.”
3. If the currently assigned P
HI
/P
LO
designations do not reflect the actual installation as recorded from
Step 1, change the P
HI
/P
LO
assignments using either of the following commands:
Set Module 1 = P
HI
, Module 2 = P
LO
Set Module 1 = P
LO
, Module 2 = P
HI
View the DP measurement from the ERS System and verify the calculation is of positive magnitude. If the
DP measurement is of negative magnitude, use the other module assignment command from Step 3.
Figure 3-6. Example of How to Change the P
HI
and P
LO
Module Assignments
Fast Keys
2, 2, 6
P
LO
Sensor
Serial Number 11223344
DP = P
HI
- P
LO
P
HI
Sensor
Serial Number 44332211
1
2
3
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