Rosemount Analytical designs, manufactures and tests its products to meet many national and
international standards. Because these instruments are sophisticated technical products, you
MUST properly install, use, and maintain them to ensure they continue to operate within their
normal specifications. The following instructions MUST be adhered to and integrated into your
safety program when installing, using, and maintaining Rosemount Analytical products. Failure to
follow the proper instructions may cause any one of the following situations to occur: Loss of life;
personal injury; property damage; damage to this instrument; and warranty invalidation.
• Read all instructions prior to installing, operating, and servicing the product.
• If you do not understand any of the instructions, contact your Rosemount Analytical repre-
sentative for clarification.
• Follow all warnings, cautions, and instructions marked on and supplied with the product.
• Inform and educate your personnel in the proper installation, operation, and mainte-
nance of the product.
• Install your equipment as specified in the Installation Instructions of the appropriate In-
struction Manual and per applicable local and national codes. Connect all products to the
proper electrical and pressure sources.
• To ensure proper performance, use qualified personnel to install, operate, update, program,
and maintain the product.
• When replacement parts are required, ensure that qualified people use replacement parts
specified by Rosemount. Unauthorized parts and procedures can affect the product’s performance, place the safe operation of your process at risk, and VOID YOUR WARRANTY.
Look-alike substitutions may result in fire, electrical hazards, or improper operation.
• Ensure that all equipment doors are closed and protective covers are in place, except
when maintenance is being performed by qualified persons, to prevent electrical shock
and personal injury.
The information contained in this document is subject to change without notice.
Emerson Process Management
Rosemount Analytical Inc.
Process Analytic Division
1201 N. Main St.
Orrville, OH 44667-0901
T (330) 682-9010
F (330) 684-4434
e-mail: gas.csc@EmersonProcess.com
http://www.processanalytic.com
HIGHLIGHTS OF CHANGES
Effective June, 1998 Rev. 1.0
PageSummary
Page 2-10Corrected part numbers in Figure 2-9 for Flowmeter and Ref Air Set.
Page 3-4Modified Figure 3-5 to reflect selection of additional faults.
Page 3-11Modified paragraph 3-6a to select additional fault screens.
Page 4-4Updated menus for O
Page 8-1Added in replacement part numbers for Model 3081 Transmitter.
Effective April, 1999 Rev. 1.1
PageSummary
CoverAdded “Model 3081FG” to manual title.
Page 1-2Deleted 48 in. probe and Mullite probe options from Product Matrix.
Page 1-7Deleted 48 in. probe and Mullite probe references from specifications.
Page 2-1 through 2-6Changed probe installation mounting and insertion procedures and
requirements.
Page 5-1Revised PC board stack replacement procedure.
ThroughoutChanged all references to “power supply board” to read “analog board”.
Reformatted document in accordance with the latest style guide.
Effective October, 2000 Rev. 1.2
PageSummary
ThroughoutChanged all references of 38 in. (965 mm) probe to 34.625 in.
(880 mm).
value, SV, TV, and 4V values.
2
Effective April, 2001 Rev. 1.3
PageSummary
Page 2-9Added 1st WARNING to paragraph 2-3.
Page 10-2Added drawing 1400184.
Effective January, 2002 Rev. 1.4
PageSummary
Page 8-1Added part number for PC Board Stack Assembly.
Effective September, 2002 Rev. 1.5
PageSummary
Page 1-7Updated process temperature limits specification.
Table 3-1. Model 3081 Transmitter Parameters ................................................................... 3-10
Table 8-1. Replacement Parts List.......................................................................................... 8-1
Rosemount Analytical Inc. A Division of Emerson Process Managementiii
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
ivRosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
The purpose of this manual is to provide information concerning the components, functions, installation and maintenance of the Model 3081FG Two-Wire In Situ Oxygen Analyzer (550° to 1600°C).
Some sections may describe equipment not used in your configuration. The user should
become thoroughly familiar with the operation of this module before operating it. Read
this instruction manual completely.
The following definitions apply to WARNINGS, CAUTIONS, and NOTES found throughout this
publication.
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
PREFACE
DEFINITIONS
Highlights an operation or maintenance
procedure, practice, condition, statement, etc. If not strictly observed, could
result in injury, death, or long-term
health hazards of personnel.
Highlights an essential operating procedure,
condition, or statement.
: EARTH (GROUND) TERMINAL
: PROTECTIVE CONDUCTOR TERMINAL
: RISK OF ELECTRICAL SHOCK
: WARNING: REFER TO INSTRUCTION BULLETIN
NOTE TO USERS
Highlights an operation or maintenance
procedure, practice, condition, statement, etc. If not strictly observed, could
result in damage to or destruction of
equipment, or loss of effectiveness.
NOTE
The number in the lower right corner of each illustration in this publication is a manual illustration number. It is not a part number, and is not related to the illustration in any technical
manner.
Rosemount Analytical Inc. A Division of Emerson Process ManagementP-1
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
FOR THE WIRING AND INSTALLATION
The following safety instructions apply specifically to all EU member states. They should
be strictly adhered to in order to assure compliance with the Low Voltage Directive. NonEU states should also comply with the following unless superseded by local or National
Standards.
1. Adequate earth connections should be made to all earthing points, internal and external,
where provided.
2. After installation or troubleshooting, all safety covers and safety grounds must be replaced.
The integrity of all earth terminals must be maintained at all times.
3. Mains supply cords should comply with the requirements of IEC227 or IEC245.
Model 3081FG
IMPORTANT
SAFETY INSTRUCTIONS
OF THIS APPARATUS
4. All wiring shall be suitable for use in an ambient temperature of greater than 75°C.
5. All cable glands used should be of such internal dimensions as to provide adequate cable
anchorage.
6. To ensure safe operation of this equipment, connection to the mains supply should only be
made through a circuit breaker which will disconnect all circuits carrying conductors during a
fault situation. The circuit breaker may also include a mechanically operated isolating switch.
If not, then another means of disconnecting the equipment from the supply must be provided
and clearly marked as such. Circuit breakers or switches must comply with a recognized
standard such as IEC947. All wiring must conform with any local standards.
7. Where equipment or covers are marked with the symbol to the right, hazardous voltages are likely to be present beneath. These covers should only be
removed when power is removed from the equipment — and then only by
trained service personnel.
8. Where equipment or covers are marked with the symbol to the right, there is a
danger from hot surfaces beneath. These covers should only be removed by
trained service personnel when power is removed from the equipment. Certain surfaces may remain hot to the touch.
9. Where equipment or covers are marked with the symbol to the right, refer to
the Operator Manual for instructions.
10. All graphical symbols used in this product are from one or more of the following standards: EN61010-1, IEC417, and ISO3864.
P-2Rosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
1
DESCRIPTION AND SPECIFICATIONS
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
SECTION 1
1-1 COMPONENT CHECKLIST OF TYPICAL
SYSTEM (PACKAGE CONTENTS)
A typical Rosemount Two-Wire In Situ Oxygen
Analyzer should contain the items shown in
Figure 1-1. Record the part number, serial number, and order number for each component of
your system in the table located on the first
8
MAN4275A00
English
October1994
HART Communicator
o
page of this manual. Also, use the product matrix in Table 1-1 to compare your order number
against your unit. The first part of the matrix defines the model. The last part defines the various options and features of the analyzer.
Ensure the features and options specified by
your order number are on or included with the
unit.
1
2
3
TM
FISHER-ROSEMOUNT
6
1. Instruction Bulletin
2. Model 3081 Transmitter
3. Oxygen Probe
4. Adapter Plate with mounting hardware
and gasket (Optional)
Figure 1-1. Typical System Package
7
5
4
5. Infrared Remote Control (IRC) (Optional)
6. Reference Air Set (Optional)
7. HART
®
Communicator Package (Optional)
8. Pipe Mounting Kit (Optional)
26020036
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-1
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Table 1-1. Product Matrix
3081FGHigh Temperature Oxygen Flue Gas Analyzer
High Temperature Analyzer - Instruction Book
CodeSensing Probe Length
120 in. (508 mm) probe, 1/4 in. tube fittings
226 in. (660 mm) probe, 1/4 in. tube fittings
334.625 in. (880 mm) probe, 1/4 in. tube fittings
CodeProbe Outer Tube Material - Maximum Operating Temperature
1Alumina - 2912°F (1600°C) maximum - 1.25 NPT mounting
2Inconel 600 - 1832°F (1000°C) maximum - 1.25 NPT mounting
CodeMounting Adapter - Stack Side
0No adapter plate required uses 1.25 NPT
("0" must also be chosen under "Mounting Adapter" below)
2Model 450 mounting ("4" must also be chosen under "Mounting Adapter" below)
3Competitor's Mount ("5" must also be chosen under "Mounting Adapter" below)
CodeMounting Adapter - Probe Side
0No adapter plate
1ANSI 2 in. 150 lb flange to 1.25 NPT adapter
(6 in. dia. flange, 4.75 in. BC with 4 x 0.75 in. dia. holes)
2DIN to 1.25 NPT adapter (184 mm flange, 145 mm BC with 4 x 18 mm dia. holes)
3JIS to 1.25 NPT adapter (155 mm flange, 130 mm BC with 4 x 13 mm dia. holes)
4Model 450 to 1.25 NPT adapter
5Competitor's mounting flange
CodeElectronics & Housing - Intrinsically Safe, NEMA 4X, IP65
13081 Electronics (Hart-compatible) - CENELEC EEx ia IIC T5
23081 Electronics (Hart-compatible) - CSA pending
33081 Electronics (Hart-compatible) - FM Class I, Div. I, Groups B,C,D
CodeHousing Mounting
0Surface or wall mounting
11/2 to 2 in. pipe mounting
CodeCommunications
0No remote control
1Infrared Remote Control (IRC)
(LCD display through cover window)
CodeCalibration Accessories
1No hardware
2Calibration and reference air flowmeters and refer-
ence air pressure regulator
CodeArmored Cable Length
00No cable
1120 ft (6 m)
1240 ft (12 m)
1360 ft (18 m)
1480 ft (24 m)
15100 ft (30 m)
16150 ft (45 m)
17200 ft (61 m)
18300 ft (91 m)
19400 ft (122 m)
20500 ft (152 m)
3081FG2100111211 Example
Model 3081FG
1-2 Description and SpecificationsRosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
1
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
1-2 SYSTEM OVERVIEW
a. Scope
This Instruction Bulletin is designed to supply details needed to install, start up, operate, and maintain the Rosemount Two-Wire
In Situ Oxygen Analyzer. The analyzer consists of an oxygen probe and Model 3081
Transmitter. The signal conditioning electronics of the Model 3081 Transmitter outputs a 4-20 mA signal representing an O
value. An infrared remote control (IRC) allows access to setup, calibration, and diagnostics. This same information, plus
additional details, can be accessed with the
HART Model 275 handheld communicator
or Asset Management Solutions (AMS)
software.
b. System Description
The Rosemount Two-Wire In Situ Oxygen
Analyzer is designed to measure the net
concentration of oxygen in an industrial process; i.e., the oxygen remaining after all fuels have been oxidized. The oxygen probe
is permanently positioned within an exhaust
duct or stack and performs its task without
the use of a sampling system. The Model
3081 Transmitter is mounted remotely and
conditions the oxygen probe outputs.
The equipment measures oxygen percentage by reading the voltage developed
across an electrochemical cell, which consists of a small yttria-stabilized, zirconia
disc. Both sides of the disc are coated with
porous metal electrodes. The millivolt output
voltage of the cell is given by the following
Nernst equation:
EMF = KT log10(P1/P2) + C
Where:
1. P
is the partial pressure of the oxygen
2
in the measured gas on one side of the
cell.
2. P
is the partial pressure of the oxygen
1
in the reference air on the opposite side
of the cell.
3. T is the absolute temperature.
4. C is the cell constant.
5. K is an arithmetic constant.
NOTE
For best results, use clean, dry, instrument air (20.95% oxygen) as the
reference air.
NOTE
The probe uses a Type B thermocouple to measure the cell temperature.
When the cell is at 550°C to 1600°C
2
(1022°F to 2912°F) and there are unequal
oxygen concentrations across the cell, oxygen ions will travel from the high oxygen
partial pressure side to the low oxygen partial pressure side of the cell. The resulting
logarithmic output voltage is approximately
50 mV per decade.
The output is proportional to the inverse
logarithm of the oxygen concentration.
Therefore, the output signal increases as
the oxygen concentration of the sample gas
decreases. This characteristic enables the
Rosemount Two-Wire In Situ Oxygen Analyzer to provide exceptional sensitivity and
accuracy at low oxygen concentrations.
Oxygen analyzer equipment measures net
oxygen concentration in the presence of all
the products of combustion, including water
vapor. Therefore, it may be considered an
analysis on a "wet" basis. In comparison
with older methods, such as the portable
apparatus, which provides an analysis on a
"dry" gas basis, the "wet" analysis will, in
general, indicate a lower percentage of oxygen. The difference will be proportional to
the water content of the sampled gas
stream.
c. System Configuration
The equipment discussed in this manual
consists of two major components: the oxygen probe and the Model 3081 Transmitter.
Oxygen probes are available in three length
options, providing in situ penetration appropriate to the size of the stack or duct. The
options on length are 20 in. (508 mm), 26 in.
(660 mm), or 34.625 in. (880 mm).
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-3
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
The Model 3081 Transmitter is a two-wire
transmitter providing an isolated output, 420 mA, that is proportional to the measured
oxygen concentration. A customer-supplied
24 VDC power source is required to simultaneously provide power to the electronics
and a 4-20 mA signal loop. The transmitter
accepts millivolt signals generated by the
probe and produces the outputs to be used
by other remotely connected devices. The
output is an isolated 4-20 mA linearized
current.
d. System Features
1. The cell output voltage and sensitivity
increase as the oxygen concentration
decreases.
2. High process temperatures eliminate
the need for external cell heating and
increase cell accuracy.
3. HART communication is standard. To
use the HART capability, you must
have either:
(a) HART Model 275 Communicator
(b) Asset Management Solutions
(AMS) software for the PC
(a) Infrared Remote Control. The IRC
allows access to fault indication
menus on the Model 3081 Transmitter LCD display. Calibration can
be performed from the IRC keypad.
(b) Optional HART Interface. The
Two-Wire In Situ Oxygen Analyzer’s 4-20 mA output line transmits an analog signal proportional
to the oxygen level. The HART
output is superimposed on the 4-20
mA output line. This information
can be accessed through the
following:
1 Rosemount Model 275 Hand-
held Communicator - The
handheld communicator requires Device Description
(DD) software specific to the
Two-Wire In Situ Oxygen
Analyzer. The DD software
will be supplied with many
Model 275 units but can also
be programmed into existing
units at most FisherRosemount service offices.
See Section 4, HART/AMS,
for additional HART
information.
4. Easy probe replacement due to the
light-weight, compact probe design.
5. Remote location of the Model 3081
Transmitter removes the electronics
from high temperature or corrosive
environments.
6. Power is supplied to the electronics
through the 4-20 mA line for intrinsic
safety (IS) purposes.
7. Infrared remote control (IRC) allows
interfacing without exposing the
electronics.
8. An operator can operate and diagnostically troubleshoot the Two-Wire In
Situ Oxygen Analyzer in one of two
ways:
1-4 Description and SpecificationsRosemount Analytical Inc. A Division of Emerson Process Management
9. Selected Distributed Control Systems -
10. A calibration check procedure is pro-
2 Personal Computer (PC) -
The use of a personal computer requires AMS software
available from FisherRosemount.
The use of distributed control systems
requires input/output (I/O) hardware
and AMS Security codes are provided
to (by infrared remote control) prevent
unintended changes to analyzers adjacent to the one being accessed.
vided to determine if the Rosemount
Two-Wire In Situ Oxygen Analyzer is
correctly measuring the net oxygen
concentration in the industrial process.
Model 3081FG
1
TWO-WIRE IN SITU
OXYGEN ANALYZER
CALIBRATION CHECK
GAS LINE
REFERENCE
Figure 1-2. Two-Wire In Situ Oxygen Analyzer HART Connections and AMS Application
AIR LINE
OmV
2
SIGNAL
MODEL 3081
TRANSMITTER
TEMPERATURE
mV SIGNAL
4-20 mA OUTPUT
(TWISTED PAIR)
TERMINATION IN
CONTROL ROOM
+
24 VDC
POWER
SUPPLY
Instruction Manual
HART MODEL 275
HAND HELD
INTERFACE
INTRINSIC
SAFETY
BARRIER
(OPTIONAL)
ASSET MANAGEMENT
IB-106-3081 Rev. 1.5
September 2002
SOLUTIONS
26020037
e. Handling the Analyzer
The probe was specially packaged to prevent breakage due to handling. Do not remove the padding material from the probe
until immediately before installation.
It is important that printed circuit
boards and integrated circuits are
handled only when adequate antistatic
precautions have been taken to prevent possible equipment damage.
The oxygen probe is designed for industrial applications. Treat with care to
avoid physical damage. The probe
contains components made from ceramic, which are susceptible to shock
when mishandled. THE WARRANTY
DOES NOT COVER DAMAGE FROM
MISHANDLING.
f. System Considerations
Prior to installing your Rosemount Two-Wire
In Situ Oxygen Analyzer, make sure you
have all the components necessary to make
the system installation. Ensure all the components are properly integrated to make the
system functional.
After verifying that you have all the components, select mounting locations and determine how each component will be placed in
terms of available line voltage, ambient
temperatures, environmental considerations, convenience, and serviceability. Figure 1-2 shows a typical system wiring. A
typical system installation is illustrated in
Figure 1-3.
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-5
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
GASES
DUCT
STACK
OXYGEN
PROBE
MODEL 3081
TRANSMITTER
4-20 mA SIGNAL
Figure 1-3. Typical System Installation
A source of instrument air is required at the
oxygen probe for reference air use. Since
the Two-Wire In Situ Oxygen Analyzer is
equipped with an in-place calibration feature, provisions should be made for connecting calibration check gas tanks to the
oxygen probe during calibration.
If the calibration check gas bottles are to be
permanently connected, a check valve is
required next to the calibration fittings on
the integral electronics.
This check valve is to prevent breathing of
calibration check gas line and subsequent
flue gas condensation and corrosion. The
OPTIONAL
ADAPTER
PLATE
FLOWMETER
INSTRUMENT
AIR SUPPLY
(REFERENCE AIR)
PRESSURE
REGULATOR
26020038
check valve is in addition to the stop valve
in the calibration check gas kit.
NOTE
The electronics of the Model 3081
Transmitter is rated NEMA 4X (IP65)
and is capable of operating at temperatures up to 65°C (149°F).
Retain the packaging in which the
Rosemount Two-Wire In Situ Oxygen
Analyzer arrived from the factory in
case any components are to be
shipped to another site. This packaging has been designed to protect the
product.
1-6 Description and SpecificationsRosemount Analytical Inc. A Division of Emerson Process Management
Instruction Manual
1
IB-106-3081 Rev. 1.5
Model 3081FG
1-3 SPECIFICATIONS
Range....................................................................... 0 to 25% O
Net O
2
Fully Field Selectable via the HART Interface
Lowest Limit................................................................. 0.05% O
Highest Limit ................................................................ 25.00% O
Accuracy .............................................................................. ±1.5% of reading or 0.05% O2, whichever is greater
System Response to Calibration Check Gas ...................... Initial response in less than 3 seconds
T90 in less than 10 seconds
PROBE
Lengths ................................................................................ 20 in. (508 mm)
26 in. (660 mm)
34.625 in. (880 mm)
Temperature Limits
Process Temperature Limits........................................ 550° to 1400°C (1022° to 2552°F)
Operation to 1600°C (2912°F) with reduced cell life.
Ambient........................................................................ -40° to 149°C (-40° to 300°F) Ambient
Mounting and Mounting Position ......................................... Vertical or Horizontal
Speed of Installation/Withdrawal ......................................... 1 in. (25.4 mm) per minute
Hazardous Area Certification............................................... Intrinsically safe per EN50 014 (1977), clause 1.3(1)
Reference Air Requirement ................................................. 100 ml per minute (0.2 scfh) of clean, dry instrument
air; 1/4 in. tube fittings
Calibration Check Gas Fittings ............................................ 1/4 in. tube fittings
Cabling................................................................................. Two twisted pairs, shielded
(1)
Thermocouple and O2 probe cell are both unpowered, developing a millivolt emf, and are considered a
“simple apparatus” by certifying agencies.
2
2
2
September 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-7
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
ELECTRONICS
Enclosure ....................................................................... IP65 (NEMA 4X), weatherproof, and corrosion-resistant
Materials of Construction ............................................... Low copper aluminum
Ambient Temperature Limits ......................................... -20° to 65°C (-4° to 149°F)
Relative Humidity ........................................................... 95% with covers sealed
Power Supply and Load Requirements ......................... See Figure 1-4
Inputs (from O
Probe)................................................... Two wires - O2 signal
2
Two wires - type B thermocouple
Output ............................................................................ One 4-20 mA signal with superimposed digital HART
signal
Hazardous Area Certification......................................... Cenelec EEx ia IIC T4 or T5(2)
NEC Class I Div. I Group B,C,D
Fisher-Rosemount has satisfied all obligations coming from the European legislation
to harmonize the product requirements in
Europe.
Power Transient Protection ........................................... IEC 801-4
Shipping Weight............................................................. 10 lbs (4.5 kg)
INFRARED REMOTE CONTROL
Power Requirements .....................................................Three AAA batteries
Hazardous Area Certification......................................... Cenelec EEx ia IIC Class I, Div. I, Group A, B, C, D
(2)
Dependent on ambient temperature limits.
Model 3081FG
1848
1800
1500
1000
LOAD (OHMS)
500
250
0
12.0 VDC18 VDC40 VDC @ ZERO LOAD42.4 VDC
LIFT OFF
WITHOUT HART COMMUNICATOR
POWER SUPPLY VOLTAGE
OPERATING
REGION
MAXIMUM
Figure 1-4. Power Supply and Load Requirements
1848
OHMS
@ 42.4
VDC
600
OHMS
@ 42.4
VDC
29750007
1-8 Description and SpecificationsRosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
2
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
SECTION 2
INSTALLATION
2-1 PRE-INSTALLATION
a. Inspect
Carefully inspect the shipping container for
any evidence of damage. If the container is
damaged, notify the carrier immediately.
b. Packing List
Confirm that all items shown on the packing
list are present. Notify Rosemount Analytical
immediately if items are missing.
Before installing this equipment, read
the “Safety instructions for the wiring
and installation of this apparatus” at
the front of this Instruction Bulletin.
Failure to follow the safety instructions could result in serious injury or
death.
2-2 MECHANICAL INSTALLATION
Avoid installation locations near
steam soot blowers.
sensing point should be selected so
the process gas temperature falls
within a range of 550° to 1600°C
(1022° to 2912°F). Figure 2-1 provides
mechanical installation references.
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 probe 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 probe. Allow adequate
clearance for probe removal (Figure
2-1).
b. Installing Oxygen Probe
The probe was specially packaged to
prevent breakage due to handling. Do
not remove the padding material from
the probe until immediately before
installation.
a. Locating Oxygen Probe
1. The location of the oxygen probe in
the stack or flue is important for maximum accuracy in the oxygen analyzing
process. The probe must be positioned
so the gas it measures is representative of the process. Best results are
normally obtained if the probe is positioned near the center of the duct (4060% insertion). Longer ducts may require several analyzers since the O
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
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-1
2
Leave the probe inner protective cover
in place until installation. This is required to protect the ceramic cell during movement.
1. Ensure all components are available to
install the probe.
NOTE
2. If using an optional adapter plate
(Figure 2-2) or an optional mounting
flange (Figure 2-3), weld or bolt the
component onto the duct. The through
hole in the stack or duct wall and refractory material must be 2 in. (50.8
mm) diameter, minimum.
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
1/4 TUBE FITTING
(REFERENCE
AIR PORT)
1/4 TUBE FITTING
(CALIBRATION
CHECK GAS PORT)
REFERENCE
AIR VENT
FRONT VIEW
(REMOVAL ENVELOPE)
1.1
O
(29)
DIM “A”
1.25 NPT PROCESS
CONNECTION
7.1 (180)
DIM “B”
O
4.1
(109)
SIDE VIEW
1.8
(49)
TABLE 1. INSTALLATION (REMOVAL)
PROBE
20 IN.
26 IN.
34.625 IN.
DIM “A”
20 (508)
26 (660)
34.625 (880)
DIM “B”
31 (787)
37 (940)
46 (1170)
Figure 2-1. Probe Installation Details
BOTTOM VIEW
INSTALL WITH PORT AT
THE BOTTOM
3.0
(77)
NOTE: DIMENSIONS ARE IN INCHES WITH
MILLIMETERS IN PARENTHESES.
3/4 NPT
CONDUIT
PORT
29750001
2-2 InstallationRosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
2
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
A
B
C
NOTE: DIMENSIONS ARE
IN INCHES WITH
MILLIMETERS IN
PARENTHESES.
DIMENSION
“B” THREAD0.625-11M-16x2M-12x1.75
“C” DIA.4.75 (121)5.71 (145)5.12 (130)
METAL WALL
STACK OR DUCT
A
WELD OR BOLT ADAPTER
PLATE TO STACK OR DUCT.
JOINT MUST BE AIR TIGHT.
ANSI
4512C34G01
“A”6.00 (153)7.5 (191)6.50 (165)
2.50 (63.5)
MIN. DIA.
JOINT MUST
BE AIR TIGHT
PLATE DIMENSIONS
DIN
4512C36G01
MASONRY WALL
STACK
3.00 SCHEDULE 40
PIPE SLEEVE
SUPPLIED BY CUSTOMER
JIS
4512C35G01
WELD PIPE TO
ADAPTER PLATE
3.50 (89)
O.D. REF
29750002
Figure 2-2. Optional Adapter Plate
TAP 1.25 NPT
B
A
C
FLANGE DIMENSIONS
ANSI
DIMENSION
“A” DIA.6.00 (153)7.28 (185)6.10 (155)9.00 (229)
“B” DIA.0.75 (20)0.71 (18)0.59 (15)0.50 (13)
“C” DIA.4.75 (121)5.71 (145)5.12 (130)7.68 (195)
5R10158H01
DIN
5R10158H02
0.50 (12.7)
NOTE: DIMENSIONS ARE IN
INCHES WITH MILLIMETERS
IN PARENTHESES.
JIS
5R10158H03
MODEL 450
5R10158H04
29750003
Figure 2-3. Optional Probe Mounting Flange
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-3
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
STACK OR DUCT
METAL WALL
WELD PIPE TO
METAL WALL
2.0 IN. (51 mm)
MIN. DIA.
REFRACTORY
SCHEDULE 40
STACK OR DUCT
METAL WALL
ADAPTER
2 IN. NPT
PIPE
1.25 NPT
CUSTOMER
SUPPLIED
ADAPTER
INSULATE IF EXPOSED
TO AMBIENT WEATHER
CONDITIONS
2 IN. NPT
SCHEDULE 40
PIPE
CALIBRATION
CHECK
GAS LINE
REFERENCE
AIR LINE
SYSTEM
CABLE
29750004
Figure 2-4. Horizontal Probe Installation
3. If the optional adapter plates are not
used, a 2 in. NPT, schedule 40, pipe
nipple (Figure 2-4) should be welded to
the stack or duct wall.
the adapter provides the pipe threads
needed for the probe’s process fitting.
4. Where high particulate or slag is in the
flue gas stream, it may be desirable to
inset the probe in the refractory as
When a 2 in. NPT to 1.25 NPT adapter
is threaded to the welded pipe nipple,
shown in Figure 2-5. Use pipe couplings and nipples to adjust the probe
insertion depth.
2-4 InstallationRosemount Analytical Inc. A Division of Emerson Process Management
Model 3081FG
2
REFRACTORY
STACK OR
DUCT METAL
PROBE LENGTH
A
WAL L
1.5 + A
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
DIMENSION A -- 1-5/8, 2-1/2, 3, OR
4 IN. 1.25 NPT SCHEDULE 40
PIPE NIPPLE
2 IN., 1.25 NPT
PIPE COUPLING
29750005
Figure 2-5. Adjusting Probe Insertion Depth
Rosemount Analytical Inc. A Division of Emerson Process Management Installation 2-5
Instruction Manual
IB-106-3081 Rev. 1.5
September 2002
Model 3081FG
5. Use high temperature material (alumina wool) to seal around the probe
during insertion. This prevents hot
gases from escaping or cold air from
entering the stack or duct.
6. Initially insert the probe to a depth of 3
in. (76.2 mm) or 1/2 the depth of the
stack or duct refractory, whichever is
greater.
After initial insertion, do not insert the
probe at a rate exceeding 1 in. per minute (25.4 mm per minute) or damage
to the probe may result due to thermal
shock.
7. After initial insertion, insert the probe at
a rate of 1 in. (25.4 mm) per minute
until the probe is fully inserted.
8. Install anti-seize compound on the pipe
threads and screw the probe into the
process flange or adapter.
9. If insulation was removed to access the
duct work for probe mounting, make
sure the insulation is replaced afterward. See Figure 2-4.
If the ducts will be washed down during outage, MAKE SURE to power
down the probes and remove them
from the wash area.
c. Locating Model 3081 Transmitter
1. Ensure the Model 3081 Transmitter is
easily accessible for maintenance and
service and for using the infrared remote control (if applicable).
Do not allow the temperature of the
Model 3081 Transmitter exceed 65°C
(149°F) or damage to the unit may
result.
NOTE
Use anti-seize compound on threads
to ease future removal of probe.
The electrical conduit port should be
facing down for a horizontal probe installation. See Figure 2-4. In vertical
probe installations, orient the probe so
the system cable drops vertically from
the probe. Ensure the electrical conduit
is routed below the level of the terminal
block housing. This drip loop minimizes
the possibility that moisture will accumulate in the housing.
2. The ambient temperature of the transmitter housing must not exceed 65°C
(149°F). Locate the electronics in an
area where temperature extremes, vibration, and electromagnetic and radio
frequency interference are minimal.
3. Locate the Model 3081 Transmitter
within 150 ft (45.7 m) of the oxygen
probe due to wiring and signal
considerations.
2-6 InstallationRosemount Analytical Inc. A Division of Emerson Process Management
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