Emerson Rosemount 644 Reference Manual page 46

Configuration
March 2021
Simulate a digital signal using AMS Device Manager
Procedure
1. Right click on the device and select Service Tools.
2. In the left navigation window select Simulate.
3. In the group box labeled Device Variables select the variable to simulate.
4. Follow the screen prompts to simulate selected digital value.
Simulate a digital signal using LOI
Reference the
Figure 2-22: Simulating the Digital Signal 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.
2.11.3 Thermocouple degradation diagnostic
Thermocouple degradation diagnostic acts as a gauge of the general health of the
thermocouple and is indicative of any major changes in the status of the thermocouple or
the thermocouple loop. The transmitter monitors the resistance of the thermocouple loop
to detect drift conditions or wiring condition changes. The transmitter uses a baseline and
threshold Trigger value and reports the suspected status of the thermocouple based off
the difference between these values. This feature is not intended to be a precise
measurement of thermocouple status, but is a general indicator of thermocouple and
thermocouple loop health.
Thermocouple diagnostic must be Enabled as well as connected and configured to read a
thermocouple type sensor. Once the diagnostic has been activated, a baseline resistance
value is calculated. Then a Trigger threshold must be selected, which can be two, three, or
four times the baseline resistance, or the default of 5000 ohms. If the thermocouple loop
resistance reaches the Trigger Level, a maintenance alert is generated.
46
a) Sensor 1 Temperature
b) Sensor 2 Temperature (only available with option S or D)
Figure 2-22 to find the path to the simulate digital signal in the LOI menu.
CALIBRAT
DAMPING
VARIABLE MAP
TAG
ALM SAT VALUES
PASSWORD
SIMULATE
HART REV
....
Reference Manual
00809-0200-4728
SIMULATE SNSR 1
SIMULATE SNSR 2*
END SIMUL
BACK TO MENU
EXIT MENU
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