
Reference Manual
00809-0100-4801, Rev FA
October 2010
7-37
Rosemount 3051S Series
For more information on the 375 Field Communicator see document
00809-0100-4276. AMS help can be found in the AMS on-line guides within
the AMS system.
NOTE
Transmitter output is not safety-rated during the following: configuration
changes, multidrop, and loop test. Alternative means should be used to
ensure process safety during transmitter configuration and maintenance
activities.
Statistical Process Monitoring and Power Advisory Diagnostics are shipped
with a default configuration. Both these diagnostics must be configured and
the trip action set to Alarm before any additional diagnostic coverage can be
realized. The default trip action for mA Output Diagnostic is set to Alarm and
must not be changed or proper diagnostic coverage will not be realized.
Damping
User-selected damping will affect the transmitters ability to respond to
changes in the applied process. The damping value + response time should
not exceed the loop requirements.
Fast Key Sequence - 2, 2, 1, 1, 3
Alarm and Saturation Levels
DCS or safety logic solver should be configured to match transmitter
configuration. Figure 7-29 identifies the three alarm levels available and their
operation values.
Figure 7-29. Alarm Levels
Rosemount Alarm Level
Namur Alarm Level
Custom Alarm Level
(3)(4)
(1) Transmitter Failure, hardware or software alarm in LO position.
(2) Transmitter Failure, hardware or software alarm in HI position.
(3) High alarm must be at least 0.1 mA higher than the high saturation value.
(4) Low alarm must be at least 0.1 mA lower than the low saturation value.
Normal Operation
4 mA
20 mA
20.8 mA
high saturation
21.75
(2)
3.9 mA
low saturation
3.75 mA
(1)
Normal Operation
4 mA
20 mA
20.5 mA
high saturation
22.5
(2)
3.8 mA
low saturation
3.6 mA
(1)
Normal Operation
4 mA
20 mA
20.1 - 20.5 mA
high saturation
20.2 - 23.0
(2)
3.7 - 3.9 mA
low saturation
3.6 - 3.8 mA
(1)
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