Rosemount Analytical In Situ Oxygen Probes-Instruction Bulletin Addendum-Rev. 3.0 Manuals & Guides

Optional Isolation Valving System
Used With Rosemount Analytical
In Situ Oxygen Probes

Instruction Bulletin Addendum IB – ISO1000
Rev. 3- June, 2005

Customer Support Center-in US 800-433-6076
International 440-914-1261

Oxymitter 4000

Part no. ____________
Serial no. ____________
Order no. ____________

Visit our website at:

On-Line Ordering Available!

www.processanalytic.com

Applicability:
Isolation Valving Option, Oxy-Iso 2000

Utilized with Rosemount Analytical’s Oxymitter 4000/5000 series of
O

analyzers or with Rosemount Analytical’s CENELEC World

2

Class O

Analyzers. May be used with pressure-balancing option,

2

p/n 3D39811Gxx

General

Rosemount Analytical’s line of in situ oxygen analyzers utilize zirconium oxide
(ZrO

) sensing technology which is sensitive to pressure variations in the

2

process.
Rosemount Analytical’s Oxymitter and World Class probes place the sensing
cell at the end of an in situ probe that inserts directly into the process gas
stream. This arrangement provides fast response and is very resistant to
pluggage from particulate material or the acids that frequently condense within
normal flue gas.
The ZrO
and an output change of approximately 1% of reading
range, or 1% O

sensing technology is sensitive to pressure changes in the process

2

(not 1 % of full scale

) for every 4 inches of H2O pressure or vacuum in the process

2

can be expected. See the instruction bulleton for the separate “pressure
balancing system” for a more complete description of the pressure effects, and
our accommodation to nullify these effects.
Process pressures of more than 1 PSI also present the challenge of removing
or inserting the probe for maintenance purposes while the process is on line.
Hot, noxious combustion gases can make the removal and installation
procedure hazardous, especially when the operation is conducted at elevation
and on less than adequate catwalks.
This isolation valving system facilitates the insertion and withdrawal of the probe
for service while the process is under pressure. This valving system is
recommended if the process cannot be shut down for probe maintenance.

Unpacking

The Isolation Valving system will be shipped separately from the O

probe and other

2

options, such as pressure balancing and automatic calibration gas sequencer. The
isolation valving system is shipped as a compact assembly, but after unpacking, it’s best
to disassemble the guide bars and packing box so that many lighter components can be
installed as opposed to one heavy assembly.

Mechanical/Pneumatic Installation- Isolation Valving System

The process must be off-line before conducting the installation and the
temperatures at the installation point must have operating temperatures of less
than 1,300

0

F (7050 C).
Process ductwork must be prepared by mounting a 3-inch, 300-pound nozzle
with a length no longer than 12 inches. A 3-inch, 300-pound ANSI flange is
required at the end of this nozzle. Ensure that the installation will permit the
probe to insert at least 6 inches into the process ductwork. (See
insertion/removal envelope drawing at the end of this manual). Place the
provided gasket onto the flange and bolt the isolation gate valve to the nozzle

IB Addendum ISO1000

2

flange with the packing box assembly and O2 probe removed. O2 probe
installation may be conducted with the process on-line once the Isolation Valve
is installed and closed.
Install the packing box housing weldment onto the isolation valve.

(Isolation valve would be to the right, but is removed in this photo sequence for
clarity.)

IB Addendum ISO1000

3

Next install the removable guide rods, and then the sliding probe carrier
assembly.

IB Addendum ISO1000

4

Probe carrier assembly.

Remove the flame arrestor from the end of the Oxymitter O2 probe, and place
the probe into the cradle of the sliding carrier assembly with the probe flange
behind the carrier assembly, and lock the retaining bar up. Note that the L­shaped piece at the 12 o’clock position will contain the probe from sliding back
under pressure, but also permit the probe to be rotated back and forth to assist
removal.

IB Addendum ISO1000

5

String the following components onto the probe body:

- adjustment plate for gasket compression ring

- 8-hole packing box retaining ring

- gasket compression ring

- packing box , without rope gaskets

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6

Insert the three rings of packing material into the packing box, pushing each
ring to the back of the box. Ensure that the point where the gasket ends meet
is indexed from gasket to gasket. For instance, it would be good for the ends
of gasket #1 to meet at a 12 o’clock orientation, gasket # 2 ends to meet at 4
o’clock, and gasket # 3 ends to meet at 8 o’clock.

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7

Before inserting the probe into the packing box housing, ensure that the face
gasket at the back of the housing is in place. Also shown is the split ring with
knurled teeth. This is depicted for clarity, but must be removed for probe
insertion, and reassembled around the probe body.

IB Addendum ISO1000

8

Reinstall the flame arrestor/ diffusion element assembly onto the end of the
probe. Make sure to use Rosemount’s white mineral antisieze compound on
the threads. Do not use any petroleum based antisieze. Remember to orient
the V-deflector shield (if using a ceramic diffusion element) into the direction of
the process flow.
Slide the carrier assembly forward so that the probe inserts through the packing
box weldment, and to the closed gate of the gate valve.

IB Addendum ISO1000

9

A split knurled ring is provided to scrape off cemented catalyst material that may
be deposited onto the probe body during subsequent removal. Insert the split
ring into the back of the packing box housing around the probe body. Ensure
that the small hole in the top half of the split ring fits over the pin in the back of
the weldment.

IB Addendum ISO1000

10