Figure 8-3 Fuse Locations
8.3 Diagnostic Alarms
Always install a blocking diode on the customers relay coil. Failure to install a blocking diode may
create noise spikes and cause faults in the OCX electronics.
The Hazardous Area OCX 8800 is equipped with a set of alarm relay contacts on the
microprocessor board in the electronics housing. This set of dry contacts can be connected to
any customer supplied relay device, 30 VDC, 30 mA maximum. A blocking diode is required
on the customers relay coil.
Any fault condition in the Hazardous Area OCX 8800 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 Appendix B: SPA with HART Alarm.
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