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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
8-2
Total Power Loss In the event that the Hazardous Area OCX 8800 will not power up at all, check
the incoming power supply to make sure power is being delivered to the
Hazardous Area OCX 8800. If the incoming power supply is good, then check
fuses F1 and F6 in the electronics housing. Refer to Figure 8-1 for fuse
locations.
Figure 8-1. Fuse Locations
DIAGNOSTIC ALARMS
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.
F6
Neutral (N)
10 Amp, 250 VAC
F1
Line (L1)
10 Amp, 250 VAC
F3
O2 and COe Heater
4 Amp, 250 VAC
F4
Sample Block Heater
8 Amp, 250 VAC
37390050
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.