Emerson B-106-300NH instruction manual Section Installation, Oxygen Analyzer Probe Installation

Instruction Manual

World Class 3000

IB-106-300NH Rev. 4.2 July 2002

SECTION 2

INSTALLATION

2-1 OXYGEN ANALYZER (PROBE)

INSTALLATION

Before starting to install this equip- ment, read the "Safety instructions for wiring and installation of this appara- tus" at the front of this Instruction Bulletin. Failure to follow the safety instructions could result in serious injury or death.

a.Selecting Location

1.The location of the probe in the stack or flue is most important for maximum accuracy in the oxygen analyzing pro- cess. The probe must be positioned so that the gas it measures is representa- tive of the process. Best results are normally obtained if the probe is posi- tioned near the center of the duct (40 to 60% insertion). A point too near the edge or wall of the duct may not pro- vide a representative sample because of the possibility of gas stratification. In addition, the sensing point should be selected so that the process gas tem- perature falls within a range of 50° to 1300°F (10° to 704°C). Figure 2-1pro- vides mechanical installation references.

2.Check the flue or stack for holes and air leakage. The presence of this con- dition will substantially affect the accu- racy of the oxygen reading. Therefore, either make necessary repairs or install the probe upstream of any leakage.

3.Ensure that the area is clear of ob- structions internal and external that will interfere with installation. Allow ade- quate clearance for removal of probe (Figure 2-1).

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4.If the probe is to be mounted outside, subject to rain and snow conditions, make sure the back of the probe (out- side of the duct) is insulated to prevent the formation of flue gas condensate in the calibration gas lines.

Do not allow the temperature of the probe junction box to exceed 300°F (149°C) or damage to the unit may re- sult. If the probe junction box tempera- ture exceeds 300°F (149°C), the user must fabricate a heat shield or provide adequate cooling air to the probe junc- tion box.

b.Mechanical Installation

1.Ensure that all components are avail- able for installation of the probe. En- sure that the system cable is the required length. If equipped with the optional ceramic diffusor element, en- sure that it is not damaged.

2.The probe may be installed intact as it is received. It is recommended that you disassemble the adapter plate for each installation.

NOTE

An abrasive shield is recommended for high velocity particulate 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 me- chanical support of the probe. Refer to Figure 2-1,sheet 5.

3.Weld or bolt adapter plate (Figure 2-1)onto the duct.

Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-1