
8.2.2
Electrical noise
Emerson has designed the transmitter to operate in the type of environment normally
found in a boiler room or control room. Noise suppression circuits are employed on all field
terminations and main inputs.
When fault finding, evaluate the electrical noise being generated in the immediate
circuitry of a faulty system. Ensure all cable shields are connected to earth.
8.2.3
Loose integrated circuits
The transmitter uses a microprocessor and supporting integrated circuits (ICs). If someone
handles the electronics roughly during installation or locates them where they are
subjected to severe vibration, the ICs could work loose.
Before troubleshooting the system, ensure all ICs are fully seated.
8.2.4
Electrostatic discharge
Electrostatic discharge can damage the ICs used in the electronics.
Before removing or handling the processor board of the ICs, ensure you are at ground
potential.
8.3
Alarm indications
The majority of the fault conditions for the transmitter will be indicated by one of the four
LEDs refered to as diagnostic or unit alarms on the operator's keypad.
An LED flashes a code that corresponds to an error message. Only one LED blinks at a time.
Emerson provides an alarm code guide inside the screw-on cover of the electronics.
Figure 8-2: Diagnostic LEDs
A. Diagnostic LEDs
Reference Manual
Troubleshoot
00809-0100-4340
October 2019
Rosemount Oxymitter 4000
117
Summary of Contents for Rosemount Oxymitter 4000
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