Emerson Rosemount 3144P Reference Manual page 86

HART Commissioning
December 2019
6. Hot Backup has been reset. Select OK.
Sensor Drift Alert configuration
HART 5 Fast Keys
HART 7 Fast Keys
Field Communicator
The sensor drift alert command allows the transmitter to set a warning flag (through HART
Protocol), or go into analog alarm when the temperature difference between Sensor 1 and
Sensor 2 exceeds a user-defined limit. This feature is useful when measuring the same
process temperature with two sensors, ideally when using a dual-element sensor. When
sensor drift alert mode is enabled, the user sets the maximum allowable difference, in
engineering units, between Sensor 1 and Sensor 2. If this maximum difference is
exceeded, a sensor drift alert warning flag will be set.
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 transmitter supports the configuration and
simultaneous use of the Hot Backup feature 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 the Hot
Backup feature improves sensor diagnostic coverage while maintaining a high level of
availability. Refer to the Rosemount 3144P FMEDA report for the impact on safety.
Problem
description:
86
2, 2, 4, 2
2, 2, 4, 2
Sensors often drift before they fail. This causes issues because during
the drift period, the sensor is not reporting as accurate measurement.
Reference Manual
00809-0100-4021
Rosemount 3144P