77
Reference Manual
00809-0100-4021, Rev JA
HART Commissioning
April 2017
HART Commissioning
5. Select
4 Reset Hot Backup
.
6. Hot Backup has been reset. Select
OK
.
Sensor drift alert configuration
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
for the impact on safety.
Problem description: Sensors often drift before they fail. This causes issues because during the drift
period, the sensor is not reporting as accurate measurement. In control loops, and especially safety loops
this can lead to improper process control and potential safety hazards.
Our solution: The sensor drift alert continuously monitors two sensor readings to detect a drifting
sensor. The diagnostic monitors the difference between the two sensors, and when the difference
becomes greater than a value entered by the user, the transmitter sends an alert to indicate a sensor drift
condition.
HART 5 Fast Keys
2, 2, 4, 2
HART 7 Fast Keys
2, 2, 4, 2
Содержание Rosemount 3144P
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