Diagnostics - Emerson Rosemount 5408 Reference Manual

Reference Manual
00809-0100-4408, Rev BA
Load limitations
For HART communication, a minimum loop resistance of
250  is required. Maximum loop resistance is determined
by the voltage level of the external power supply, as
described by Figure A-3.
Figure A-3. Load Limitations
Maximum Loop Resistance = 43.5 * (External Power Supply Voltage - 12)
1400
1322
1200
1000
800
782
600
521
400
250
200
0
17.8
12
External Power Supply Voltage (Vdc)
Signal wiring
Use 24-14 AWG. Twisted pairs and shielded wiring are
recommended for environments with high EMI
(electromagnetic interference).
Analog signal on alarm
The transmitter automatically and continuously performs
self-diagnostic routines. If a failure or a measurement error
is detected, the analog signal will be driven offscale to alert
the user. High or low failure mode is user-configurable.
Table A-3. Signal on Alarm
Standard
Rosemount standard
NAMUR NE43
(option code C4)
Analog saturation levels
The transmitter will drive the output to high or low
saturation values if measurement goes outside the 4-20 mA
range values.
Specifications and Reference Data
24
42.4
20 30 40
High Low
≥ ≤
21.75 mA 3.75 mA
(default) (option code C8)
≥ 22.50 mA ≤ 3.6 mA
(option code C5)
Specifications and Reference Data
Table A-4. Saturation Levels
Standard
Rosemount standard
(default and option code C8)
NAMUR NE43
(option code C4 and C5)
A.2.4 Diagnostics
Alerts
The Rosemount 5408 and 5408:SIS are compliant with
NAMUR NE 107 Field Diagnostics for standardized device
diagnostic information.
Tools and logging in Rosemount Radar
Master Plus
50
Echo curve

Measurement and alert log

Rosemount Radar Master Plus, embedded in Instrument
Inspector, enables easy and powerful troubleshooting with
the echo curve tool as well as the measurement and alert
log.
The measurement and alert log holds records of the last
seven days of level readings and echo curve profiles, as well
as the 50 last alert events. The logs can be transferred from
the transmitter's internal memory to a local computer and
be presented in a graphical time line, enabling analysis of
historical behaviors.
Smart Diagnostics Suite (option code
DA1)
Signal Quality Metrics - Diagnostics package that monitors
the relations between surface, noise, and threshold. The
function can be used to detect abnormal conditions in the
process such as antenna contamination or sudden loss of
signal strength. Signal Quality is available as output variable
and it comes with user configurable alerts.
Power Advisory - The transmitter automatically measures
and monitors the input voltage. If the voltage is too low,
operators will be provided with an early alert.
November 2017
High Low
20.8 mA 3.9 mA
20.5 mA 3.8 mA
139