9.2 Diagnostic alarms
CAUTION
Electronics failure
Failure to install a blocking diode may create noise spikes and cause faults in the
electronics.
Always install a blocking diode on the customer's relay coil.
The transmitter is equipped with a set of alarm relay contacts on the
microprocessor board in the electronics housing. You can connect this set of dry
contacts to any customer supplied relay device, 30 Vdc, 30 mA maximum. A
blocking diode is required on the customer's relay coil.
Any fault condition in the transmitter will trip the alarm relay. The optional SPA
with HART
®
programmable alarm indicates LOW O2, HIGH COe, Calibration
Status, and Unit Failure. For more information, refer to SPA with HART
®
alarm.
9.3 Fault isolation
Faults in the transmitter are indicated by messages displayed on the Field
Communicator or local operator interface (LOI).
If a fault is indicated on the Field Communicator or LOI, locate the fault indication
in the following sections. For each fault listed, there are related potential causes
and recommended actions. The potential causes are listed in order of most
probable to least probable. Starting with the most probable cause, inspect and
test the transmitter to isolate the actual cause; then use the recommended
corrective action listed to correct the problem.
Manual Troubleshoot
00809-0500-4880 December 2022
Rosemount OCX8800A 215
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