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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
9-2
OCX with
Integral Electronics
Remove Hazardous Area OCX 8800
1. Turn off power to the system.
2. Shut off the test gases at the cylinders and shut off the instrument air.
3. Disconnect the test gas and instrument air lines from the electronics
housing, Figure 9-1.
Figure 9-1. OCX with
Integral Electronics
4. Remove the cover from the electronics housing to expose the
electronics housing terminal blocks, Figure 9-2.
5. Disconnect and remove the power leads from the AC power input
terminal block and remove the ground lead from the ground stud.
6. Disconnect and remove the O
2
and COe signal leads from the 4-20 mA
signal output terminal block.
7. If used, disconnect and remove the external relay leads from the alarm
output relay terminal block.
8. Disconnect and remove customer power and signal wire conduits and
wiring from the electronics housing.
9. Remove insulation to access the sensor housing mounting bolts. Unbolt
the Hazardous Area OCX 8800 from the stack and take it to a clean
work area.
10. Allow the unit to cool to a comfortable working temperature.
37390043
Low O Test Gas
2
High O Test Gas
2
CO Test Gas
Instrument Air
(Reference Gas)
Duct
Stack
AC Power Input
Signal Outputs
(Twisted Pairs)
Adapter
Plate
Electronics
Housing
Sensor
Housing
Explosion hazard! Before removing cover from sensor or electronics housing, allow at least
45 minutes to pass after power is disconnected. Failure to allow adequate time for all
internal electrical charges to dissipate can result in serious injury or death..