Emerson Process Management IB106-340 instruction manual Oxymitter

Instruction Manual

IB-106-340 Rev. 2.4 April, 2001

Oxymitter 4000

NOTE

To determine if the diffusion element needs to be replaced, refer to para- graph 6-2.

c.If equipped with the optional ceramic diffu- sion assembly, remove and discard the setscrews and remove the vee deflector (Figure 6-10). Use spanner wrenches from the probe disassembly kit (Table 9-1),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 entire electronics per paragraph 6-5a,steps 2 through 6.

f.If the contact assembly is damaged, replace the strut or the contact pad. Instructions for replacing the contact pad are in the cell re- placement kit.

g.Remove and discard the corrugated seal. Clean the mating faces of the probe tube and retainer. Remove burrs and raised surfaces with a block of wood and crocus cloth. Clean the threads on the retainer and hub.

h.Rub a small amount of anti-seize compound on both sides of the new corrugated seal.

i.Assemble the cell and flange assembly, cor- rugated seal, and probe tube. Make sure the calibration tube lines up with the cali- bration gas passage in each component. Apply a small amount of anti-seize com- pound to the screw threads and use the screws to secure assembly. Torque to 35 in- lbs (4 N·m).

j.Install the entire electronics per paragraph 6-5a,steps 7 through 13.

k.Apply anti-seize compound to the threads of the cell assembly, hub, and setscrews. Re- install the hub on the cell assembly. Using pin spanner wrenches, torque to 10 ft-lbs (14 N·m). If applicable, reinstall the vee de- flector, orienting apex toward gas flow. Se- cure with the setscrews and anti-seize compound. Torque to 25 in-lbs (2.8 N·m).

l.On systems equipped with an abrasive shield, install the dust seal gaskets, with joints 180° apart.

m.Reinstall the probe and gasket on the stack flange.

n.Follow the instructions in paragraph 6-4a.2to install the Oxymitter 4000 into the stack or duct. If installing an Oxymitter 4000/SPS 4000 assembly, follow the instructions in paragraph 6-4b.2.If there is an abrasive shield in the stack, make sure the dust seal gaskets are in place as they enter the 15° reducing cone.

o.Turn on power and monitor thermocouple output. It should stabilize at 29.3+0.2 mV. Set reference air flow at 2 scfh (56.6 l/hr).

After the Oxymitter 4000 stabilizes, calibrate the unit. If new components have been in- stalled, repeat calibration after 24 hours of operation.

6-14 Maintenance and Service Rosemount Analytical Inc. A Division of Emerson Process Management