Emerson Process Management IM-106-340 Mechanical Installation, Selecting Location

Oxymitter 4000

Instruction Manual

IM-106-340, Rev. 4.0 May 2006

MECHANICAL INSTALLATION

Selecting Location

1.The location of the Oxymitter 4000 in the stack or flue is most important for maximum accuracy in the oxygen analyzing process. The Oxymitter 4000 must be positioned so the gas it measures is representative of the process. Best results are normally obtained if the Oxymitter 4000 is positioned near the center of the duct (40-60% insertion). Longer ducts may require several Oxymitter 4000 units since the O2 can vary due to stratification. A point too near the wall of the duct, or the inside radius of a bend, may not provide a representative sample because of the very low flow conditions. The sensing point should be selected so the process gas temperature falls within a range of 32° to 1300°F

(0° to 704°C). Figure 2-1through Figure 2-8provide mechanical installation references. The ambient temperature of the integral electronics housing must not exceed 185°F (85°C). For higher ambient temperatures, we recommend the remote mounted electronics option.

2.Check the flue or stack for holes and air leakage. The presence of this condition will substantially affect the accuracy of the oxygen reading. Therefore, either make the necessary repairs or install the Oxymitter 4000 upstream of any leakage.

3.Ensure the area is clear of internal and external obstructions that will interfere with installation and maintenance access to the membrane keypad or LOI. Allow adequate clearance for removal of the Oxymitter 4000.

Do not allow the temperature of the Oxymitter 4000 electronics to exceed 185°F (85°C) or damage to the unit may result.

Probe Installation

1.Ensure all components are available to install the Oxymitter 4000. If equipped with the optional ceramic diffusion element, ensure it is not damaged.

2.The Oxymitter 4000 may be installed intact as it is received.

NOTE

An abrasive shield is recommended for high velocity particulates in the flue stream (such as those in coal-fired boilers, kilns, and recovery boilers). Vertical and horizontal brace clamps are provided for 9 ft and 12 ft (2,75 m and 3,66 m) probes to provide mechanical support for the Oxymitter 4000. Refer to Figure 2-6.

3.Weld or bolt adapter plate (Figure 2-5) onto the duct.

4.If using the optional ceramic diffusion element, the vee deflector must be correctly oriented. Before inserting the Oxymitter 4000, check the direction of gas flow in the duct. Orient the vee deflector so the apex points upstream toward the flow (Figure 2-7). This may be done by loosening the setscrews and rotating the vee deflector to the desired position. Retighten the setscrews.

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