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Reference Manual
00809-0100-4021, Rev FB
August 2011
3-17
Rosemount 3144P
HAR
T
10. From the Home screen, select
1 Device Setup, 3 Configuration, 3 Dual
Sensor Configuration, 4 Configure Hot Backup
to begin configuration of
the transmitter for Hot Backup.
11. Select yes to enable
Hot Backup.
12. After you set the control loop to manual select
OK
.
13. Select
1 Average
or
2 First Good
to set Hot Backup PV.
14. Select
OK
after you return the control loop to automatic control.
For information on using Hot Backup in conjunction with the HART Tri-Loop
see “Use with the HART Tri-Loop” on page 3-26.
Sensor Drift Alert Configuration
Field Communicator
The Sensor Drift Alert command allows the transmitter to set a warning
flag (through HART), 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 3144P, 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 3144P FMEDA report for the impact on safety.
Traditional Fast Keys
1, 3, 3, 5
Device Dashboard Fast Keys
2, 2, 4, 2
Aotewell Ltd
www.aotewell.com
Industry Automation
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