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Hazardous Area Oxymitter DR
Instruction Manual
g.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.
h.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.
i.Rub a small amount of
j.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
4 N·m (35
k.Install the termination housing per the instructions in paragraph
l.Apply
(10
m.On systems equipped with an abrasive shield, install the dust seal gaskets, with joints 180° apart.
n.Reinstall the probe and gasket on the stack flange.
o.Follow the instructions in paragraph
p.Turn on power and monitor thermocouple output. It should stabilize at 29.3+0.2 mV.
Set reference air flow at 56.6 l/hr (2 scfh). After the Hazardous Area Oxymitter DR sta- bilizes, calibrate the unit. If new components have been installed, repeat calibration after 24 hours of operation.
4-8 CERAMIC DIFFUSION ELEMENT REPLACEMENT
NOTE
This refers to the ceramic diffusion element only.
a. | General |
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| The diffusion element protects the cell from | 4 |
| particles in process gases. Normally, it does |
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| not need to be replaced because the vee |
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| deflector protects it from particulate erosion. |
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| In severe environments, the filter may be |
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| broken or subject to excessive erosion. Ex- |
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| amine the ceramic diffusion element when- |
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| ever removing the probe for any purpose. |
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| Replace if damaged. |
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| Damage to the ceramic diffusion element |
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| may become apparent during calibration. |
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| Compare probe response with previous re- |
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| sponse. A broken diffusion element will |
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| cause a slower response to calibration gas. |
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| Hex wrenches needed to remove setscrews |
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| and socket head screws in the following |
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| procedure are available as part of a Probe |
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| Disassembly Kit, Table |
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b. | Replacement Procedure |
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| 1. Follow the instructions in paragraph |
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| Oxymitter DR from the stack or duct. |
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2. Loosen setscrews, Figure
Rosemount Analytical Inc. A Division of Emerson Process Management | Maintenance and Service |