Emerson OCX 8800 Install O2 Cell and Heater Strut Assembly, Install Terminals Insulator and Cover

OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

Install O2 Cell and Heater Strut Assembly

1.Rub a small amount of anti-seize compound on both sides of new gasket (10, Figure 7-18).

2.Apply anti-seize compound to threads of O2 cell and heater strut assembly (9) and sensor housing (8).

Stripped threads on the O2 cell and heater strut assembly can allow gas leakage. Gas leakage can affect the O2 measurements and calibration. Avoid over-tightening the O2 cell and heater strut assembly .

3.Install O2 cell and heater strut assembly (9) in sensor housing (8). Snug up, but do not over-tighten the assembly.

4.Reconnect the lead wires from O2 cell, heater, and thermocouple to the sensor housing terminal blocks. Refer to Figure 7-19.

5.Install reference air tube (7, Figure 7-18) in sensor housing (8). Make sure that the open end of reference air tube extends into heater tube of O2 cell and heater strut assembly (9).

Install Terminals Insulator and Cover

1.Install insulator (6, Figure 7-18) over uppermost terminal blocks. Position one side of insulator against terminal blocks and snap terminal marking plate (5) to mating stand-off.

2.Position opposite side of insulator (6) and secure with related marking plate (5).

3.If removed, install cover gasket (4). Screw cover (3) onto sensor housing (8). Tighten cover firmly.

4.To comply with explosion-proof requirements, the cover gasket (4) must be compressed. For hazardous area applications, verify that the cover gasket is compressed.

5.Align locking clip (2) with gap between cover ribs.

6.Loosen screw (1) and slide locking clip (2) fully into gap between cover ribs. Retighten screw (1).

Sensor Housing Leak Test

1.Install 1/4 NPT cap on dilution air inlet fitting. Install a 1/4 NPT cap on sample tube (2, Figure 7-9) or plug 1/4 NPT sample inlet port. Capped or plugged ports must be air tight.

2.If not in place, install exhaust tube (3, Figure 7-9) in exhaust port according to the instructions provided.

3.Connect a calibrated manometer to the CAL GAS inlet port.

4.Connect and apply clean instrument air at 35 psig (241 kPa gage) to the instrument air inlet fitting.

5.Observe the manometer reading. The reading should be from 10 to 13 inches, Water Column. Locate and correct leaks if the reading is less than 10 inches WC.

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