Emerson ib-106-340cdr, oxymitterdr hazardous area in-siu oxygen probe instruction manual 22220028

Instruction Manual

IB-106-340CDR Original Issue January, 2002

Hazardous Area Oxymitter DR

PROBE TUBE

(NOT INCLUDED

IN KIT)

CORRUGATED

SEAL

CELL AND

FLANGE

ASSEMBLY

SOCKET HEAD

CAP SCREWS

CALIBRATION GAS

PASSAGE

The flame arrestor and flame arrestor hub are among the critical compo- nents of this type of protection.

b.If the probe uses the standard diffusion element, use a spanner wrench to remove the diffusion element.

NOTE

To determine if the diffusion element needs to be replaced, refer to para- graph 4-1.

22220028

Figure 4-4. Cell Replacement Kit

Use heat-resistant gloves and clothing when removing the probe. Do not at- tempt to work on these components until they have cooled to room tem- perature. Probe components can be as hot as 427°C (800°F). This can cause severe burns.

Disconnect and lock out power before working on any electrical components. There is voltage of up to 115 VAC.

Do not remove the cell unless certain it needs to be replaced. Removal may damage the cell and platinum pad. Go through the complete troubleshooting procedure to make sure the cell needs to be replaced before removing it.

a.Follow the instructions in paragraph 4-3ato remove the Hazardous Area Oxymitter DR from the stack or duct.

c.If equipped with the optional ceramic diffu- sion assembly, remove and discard the setscrews and remove the vee deflector (Figure 4-5). Use spanner wrenches from the probe disassembly kit (Table 7-1),to turn the hub free from the retainer. Inspect the diffusion element. If damaged, replace the element.

d.Loosen the four socket head cap screws from the cell and flange assembly and re- move the assembly and the corrugated seal. The cell flange has a notch that may be used to gently pry the flange away from the probe. Note that the contact pad inside of the probe will sometimes fuse to the oxy- gen sensing cell. If the cell is fused to the contact pad, push the cell assembly back into the probe (against spring pressure) and quickly twist the cell assembly. The cell and contact pad should separate. If the contact pad stays fused to the cell, a new contact/thermocouple assembly must be in- stalled. Disconnect the cell and the thermo- couple wires at the probe electronics and withdraw the cell with the wires still attached.

e.Remove four screws (15, Figure 4-1)and washers (14).

f.Separate the electrical connectors between the heater strut and the termination hous- ing.

4-6 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management