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Configuration
July 2016
Though it defaults to WARNING, when configuring the transmitter for Sensor Drift Alert, the user also
has the option of specifying that the analog output of the transmitter go into ALARM when sensor
drifting is detected.
Note
Using dual sensor configuration in the Rosemount 644, the temperature transmitter supports the
configuration and simultaneous use of Hot Backup and Sensor Drift Alert. If one sensor fails, the
transmitter switches output to use the remaining good sensor. Should the difference between the two
sensor readings exceed the configured threshold, the AO will go to alarm indicating the sensor drift
condition. The combination of Sensor Drift Alert and Hot Backup improves sensor diagnostic coverage
while maintaining a high level of availability. Refer to the Rosemount 644 FMEDA report for the impact
on safety.
Using a Field Communicator
The field communicator will walk you through a method to correctly configure the necessary elements
of a Sensor Drift Alert feature.
From the HOME screen, enter the Fast Key sequence
Device Dashboard Fast Keys
Using AMS Device Manager
1. Right click on the device and select Configure.
2. On the Diagnostics Tab find the Sensor Drift Alert group box.
3. Choose to Enable the Mode and fill in the Units, Threshold and Damping values from the drop
downs provided or click the "Configure Sensor Drift Alert" button and walk through the guided
steps.
4. Click Apply when complete.
Using Local Operator Interface
To configure Sensor Drift Alert on the Local Operator Interface you will have to Enable the Mode, set the
PV, set the Drift Limit and set a value for Drift Alert Damping all separately. Reference
for where to find these in the menu.
Figure 2-13. Configuring sensor drift alert with LOI
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXTENDED MENU
EXIT MENU
* Available only if option code (S) is ordered.
** Available only if option Codes (S) and (DC) are both ordered.
24
CALIBRAT
DAMPING
VARIABLE MAP
TAG
ALM SAT VALUES
PASSWORD
SIMULATE
HART REV
HOT BACK CONFIG**
DRIFT ALERT**
DRIFT ALERT**
....
Reference Manual
00809-0100-4728, Rev MB
2, 1, 6
Figure 2-13
DRIFT MODE
DRIFT LIMIT
DRIFT UNITS
DRIFT DAMP
BACK TO MENU
EXIT MENU
Configuration
below
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