Reference Manual
00809-0100-4021, Rev FB
August 2011
Rosemount 3144P
4-24
FOUNDATION Fieldbus
Figure 4-2. Screenshot of Thermocouple Resistance page on AMS 9.0
Glossary of AMS Terms
(as shown on Figure 4-2)
Trigger Level: Threshold resistance value for the thermocouple loop. The
Trigger Level may be set for 2, 3, or 4 x Baseline or the default of 5000 Ohms.
If the resistance of the thermocouple loop surpasses the Trigger Level, a
PlantWeb maintenance alert will be generated.
Resistance: This is the existing resistance reading of the thermocouple loop.
Baseline Value: The resistance of the thermocouple loop obtained after
installation, or after resetting the Baseline value. The Trigger Level may be
calculated from the Baseline Value.
Trigger Setting: May be set for 2, 3, or 4 x Baseline or the default of 5000
Ohms.
Sensor 1 Degraded: A PlantWeb maintenance alert generated when the
Thermocouple Degradation Diagnostic is enabled and the resistance in the
loop exceeds the user-configured Trigger Level. This alert indicates
maintenance may be necessary of that the thermocouple may have
degraded.
Configure: Launches a method so the user can enable or disable the
Thermocouple Degradation Diagnostic, select the Trigger Level, and
automatically calculates the Baseline value (which may take several
seconds).
Reset Baseline Value: Launches a method to recalculate the Baseline value
(which may take several seconds).
Enabled: Indicates when the Thermocouple Degradation Diagnostic is
enabled for the sensor.
Learning: Indicates when checked that the Baseline Value is being
calculated.
Licensed: The check box indicates if Thermocouple Degradation Diagnostic
is available for the specific transmitter.
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