Configure Device Outputs; Re-Range The Transmitter - Emerson Rosemount 644 with HART Protocol Reference Manual

Reference Manual
00809-0200-4728, Rev SA
2.8

Configure device outputs

2.8.1

Re-range the transmitter

Re-ranging the transmitter sets the measurement range to the limits of the expected readings for a
certain application. Setting the measurement range to the limits of expected readings maximizes
transmitter performance; the transmitter is most accurate when operated within the expected
temperature range for the application.
The range of expected readings is defined by the Lower Range Value (LRV) and Upper Range Value (URV).
The transmitter range values can be reset as often as necessary to reflect changing process conditions.
For a complete listing of Range and Sensor limits.
Note
The re-range functions should not be confused with the trim functions. Although the re-range function
matches a sensor input to a 4–20 mA output, as in conventional calibration, it does not affect the
transmitter's interpretation of the input.
Select from one of the methods below to re-range the transmitter.
Field Communicator
From the HOME screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
AMS Device Manager
1. Right click on the device and select Configure.
2. In the left navigation pane select Manual Setup.
3. On the Analog Output Tab find the Primary Variable Configuration group box.
4. Change the Upper Range Value and Lower Range Value to their desired settings.
5. Select Apply when complete.
LOI
Reference the image below to find the range value configuration path on the LOI.
Figure 2-13. Re-ranging the Transmitter with LOI
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU
Configuration
Lower range value Upper range value
2, 2, 5, 5, 3
ENTER VALUES ENTER VALUES
BACK TO MENU
EXIT MENU
Configuration
2, 2, 5, 5, 2
LRV LRV
URV URV
BACK TO MENU
EXIT MENU
July 2018
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