Emerson Rosemount 644 Reference Manual page 47

Reference Manual
00809-0200-4728
CAUTION
The thermocouple degradation diagnostic monitors the health of the entire thermocouple
loop, including wiring, terminations, junctions, and the sensor itself. Therefore, it is
imperative that the diagnostic baseline resistance be measured with the sensor fully
installed and wired in the process, and not on the bench.
Note
The thermocouple resistance algorithm does not calculate resistance values while the
active calibrator mode is enabled.
Perform thermocouple degradation diagnostic using a Field
Communicator
From the HOME screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
Perform thermocouple degradation diagnostic using AMS
Device Manager
Procedure
1. Right click on the device and select Configure.
2. In the left navigation window select Manual Setup.
3. On the Diagnostics tab, there is a group box labeled Sensor and Process
4. Follow the screen prompts to Enable and set the values for the diagnostic.
Perform thermocouple degradation diagnostic using LOI
Reference the
menu.
Figure 2-23: Configuring T/C Diagnostic with LOI
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU
* Available only if option code (S) or (D) is ordered.
Emerson.com/Rosemount
Diagnostics; select the button for Configure Thermocouple Diagnostic.
See AMS terms.
Figure 2-23 to find the path to the thermocouple diagnostic in the LOI
CALIBRAT
DAMPING
VARIABLE MAP
TAG
ALM SAT VALUES
PASSWORD
SIMULATE
HART REV
HOT BACK CONFIG*
DRIFT ALERT*
TC DIAG CONFIG
MIN MAX TRACK
BACK TO MENU
EXIT MENU
2, 2, 4, 3, 4
CONFIG SNSR 1
CONFIG SNSR 2*
BACK TO MENU
EXIT MENU
Configuration
March 2021
SENSOR 1 MODE
TRIGGER CONFIG
TRIGGER VIEW
SNSR OHM VIEW
BASELINE RE-SET
BASELINE VIEW
BACK TO MENU
EXIT MENU
47