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Instruction Manual
IM-106-350C, Rev 2.2
July 2008
8-3
Hazardous Area Oxymitter 5000
GENERAL
The troubleshooting section describes how to identify and isolate faults that
may develop in the Hazardous Area Oxymitter 5000. When troubleshooting,
reference the following.
Grounding
It is essential that adequate grounding precautions are taken when installing
the system. Thoroughly check both the probe and electronics to ensure the
grounding quality has not degraded during fault finding. The system provides
facilities for 100% effective grounding and the total elimination of ground
loops.
Electrical Noise
The Hazardous Area Oxymitter 5000 has been designed 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.
Loose Integrated Circuits
The Hazardous Area Oxymitter 5000 uses a microprocessor and supporting
integrated circuits (IC). If the electronics are handled roughly during
installation or located where subjected to severe vibration, the ICs could work
loose. Before troubleshooting the system, ensure all ICs are fully seated.
Electrostatic Discharge
Electrostatic discharge can damage the ICs used in the electronics. Before
removing or handling the processor board or the ICs, ensure you are at
ground potential.
ALARM INDICATIONS
The majority of the fault conditions for the Hazardous Area Oxymitter 5000
will be indicated by one of the four LEDs referred to as diagnostic, or unit
alarms on the operator's keypad (Figure 8-2). An LED will flash a code that
will correspond to an error message. Only one LED will blink at a time. An
alarm code guide is provided inside the screw-on cover for the electronics.
Alarm indications will be also available via the optional LOI or the fieldbus
computer terminal. When the error is corrected and/or power is cycled, the
diagnostic alarms will clear or the next error on the priority list will appear.
Install all protective equipment covers and safety ground leads after troubleshooting. Failure
to install covers and ground leads could result in serious injury or death.
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