Emerson Rosemount5081, Instruction Manual, Page: 104 / 152

There is a high probability that the measurement is in error. A fault alerts you that a
disabling condition exists. If a fault message is showing, all measurements should be
regarded as erroneous.
When a warning condition exists:
1. The main display remains stable. It does not flash.
2. A warning message appears alternately with the temperature and output readings
in the second line of the display. See
Section 8.3.4 for an explanation of the warning
messages and suggested ways of correcting the problem.
When a fault exists:
1. The main display flashes.
2. The words FAULT and HOLD appear in the main display.
3. A fault message appears alternately with the temperature and output readings in
the second line of the display. See
Section 8.3.4 for an explanation of the fault
messages and suggested ways of correcting the problem.
4. The output current will remain at the present value or go to the programmed fault
value.
5. If the transmitter is in HOLD when the fault occurs, the output remains at the
programmed hold value. To alert you that a fault exists, the word FAULT appears in
the main display, and the display flashes. A fault or diagnostic message also appears.
6. If the transmitter is simulating an output current when the fault occurs, the
transmitter continues to generate the simulated current. To alert you that a fault
exists, the word FAULT appears in the display, and the display flashes.
8.4.2 Troubleshooting fault or warning messages
The following table explains the fault or warning messages displayed on the 5081-A
transmitter.
Message Explanation See section
OuEr rAnGe Over range, measurement exceeds display lim-
it OuEr rAnGE and AMP FAIL
AMP FAIL Amperometric sensor failure, sensor current is
too high OuEr rAnGE and AMP FAIL
bAd SEnSor Bad sensor, sensor current is a large negative
number bAd SEnSor
0 too biG Zero current is too large, sensor was zeroed
while current exceeded 100 nA 0 too bIG
CAL Error Calibration error, sensitivity (nA/ppm) is too
high or too low CAL Error
nEEd 0 CAL Sensor needs re-zeroing, reading is too nega-
tive nEEd 0 CAL
Diagnostics and troubleshooting
94 Rosemount 5081