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Reference Manual
00809-0100-4021, Rev DA
November 2004
6-3
Rosemount 3144P
Certified SIS
Security Switch
Position the security switch to the “ON” position to prevent accidental or
deliberate change of configuration data during normal operation.
SIS Additions In addition to the dual sensor configurations available in the standard 3144P,
the safety certified 3144P HART transmitter supports the configuration and
simultaneous use of Hot Backup and Sensor Drift Alert Alarm. If one sensor
fails, the transmitter will switch its 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 Alarm and Hot Backup
improves sensor diagnostic coverage while maintaining a high level of
availability. Refer to the 3144P SIS FMEDA report for the impact on safety.
TRANSMITTER
DIAGNOSTICS LOGGING
The Transmitter Diagnostics Logging feature will store advanced diagnostics
information between device resets. This feature stores what caused the
transmitter to go into alarm even if that event has disappeared. For example,
if the transmitter detects an open sensor due to a loose terminal connection
the transmitter will go into alarm. If, due to vibration, that wire begins making a
good connection, the transmitter will come out of alarm. This jumping in and
out of alarm is very frustrating when determining what is causing the problem.
However, the Diagnostics Logging feature will keep track of what caused the
transmitter to go into alarm and will save valuable debugging time. This
information is available via the field communicator and AMS.