Emerson Process Management 3000 - Manual (Page 33)

Instruction Manual
IB-106-300NH Rev. 4.2
July 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-1
World Class 3000
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 2-1 pro-
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).
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.
2