Emerson OCX 8800 instruction manual OCX with Integral Electronics, Remove OCX

OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

OCX with

Integral Electronics

Remove 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 7-1.

Figure 7-1. OCX with Integral Electronics

Adapter
Plate	Duct
Stack	O2 and COe
	4-20 mA Outputs
	(2 Twisted Pairs)
	AC Power Input
Sensor
Housing	Instrument Air
Electronics	(Reference Gas)
Housing
	High O2 Test Gas
	Low O2 Test Gas
	CO Test Gas

37390043

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.

4.Remove the cover from the electronics housing to expose the electronics housing terminal blocks, Figure 7-2.

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 O2 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 OCX 8800 from the stack and take it to a clean work area.

10.Allow the unit to cool to a comfortable working temperature.

7-2