Emerson Rosemount5081, Instruction Manual, Page: 63 / 152

8 Diagnostics and troubleshooting
8.1 pH/ORP diagnostics and troubleshooting
8.1.1 5081-P warning and fault messages
The 5081-P pH/ORP transmitter continuously monitors the measurement loop (sensor and
transmitter) for conditions that cause erroneous measurements. When a problem occurs,
the transmitter displays either a warning or fault message. A warning alerts you that a
potentially system disabling condition exists. If the condition causing the problem is not
corrected, there is a high probability that the system will soon fail. A fault alerts you that a
system 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 display. See Figure 8-1 .
See Section 8.1.4 for an explanation of the different warnings and suggested ways of
correcting the problem.
Warning annunciation Figure 8-1:
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/output display. See
Figure 8-2 . See Section 8.1.4 for an explanation of the different 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.
Diagnostics and troubleshooting
Instruction Manual 53