Rosemount Analytical OCX8800 Operating Manual

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800
Oxygen/Combustibles Transmitter

http://www.raihome.com

HIGHLIGHTS OF CHANGES

Effective September 2009, Rev 2.0

Page/Section Summary

Throughout IM Included coverage of all General Pu rpose OCX 8800 configurations/options in to this single

Instruction Manual.
Added FOUNDATION Fieldbus communications op tion.
Added coverage of optional COe Purge/Zero function equipment illustrations with related

installation and operating procedures.
Added coverage of three optional in-situ filters.
Added coverage of optional wall-mount or rack-mount blowback panel.
Adde coverage of PlantWeb Alert data for OCX 8800 units with FOUNDATION Fieldbus

communications.
Added Appendix B coverage of optional Moore Indu st rie s Site Pprog ra m m abl e Alar m for

OCX 8800 units with HART communications.

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Table of Contents

Essential Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i

SECTION i
Introduction

SECTION 1
Description and
Specifications

SECTION 2
Installation

SECTION 3
Configuration and
Startup

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Component Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Pneumatic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

Initial Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

Verify Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Initial Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Set Test Gas Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Calibration Solenoids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Blowback Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Calibration Verify Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Calibration Tolerance Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

COe Purge / Zero Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

OCX 8800 Reset Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

SECTION 4
Using the LOI

SECTION 5
Calibration

http://www..raihome.com

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Display Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

LOI Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

LOI Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

LOI Status Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

LOI Menu Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Fully Automatic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Operator - Initiated Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Manual Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

D/A Trim Procedures - LOI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

D/A Trim Procedures - HART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

SECTION 6
Field Communicator

SECTION 7
Foundation Fieldbus

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Field Communicator Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Off-Line and On-Line Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Hart Menu Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Fieldbus Menu Tree. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Foundation Fieldbus Technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Instrument-Specific Function Blocks . . . . . . . . . . . . . . . . . . . . . . . 7-4

Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

OCX Function Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

PlantWeb Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Mapping of PWA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

PWA Simulate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Fieldbus/PWA Simulate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

Configure Simulation with the Model 375 Field Communicator . . 7-11

Support Resource Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

Transducer Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

Transducer Block Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

Transducer Block Enumerations . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

Transducer Block Channel Assignments for AI Blocks . . . . . . . . 7-22

Transducer Block Channel Status . . . . . . . . . . . . . . . . . . . . . . . . 7-22

Transducer Block Simulate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23

Support Transducer Block Errors. . . . . . . . . . . . . . . . . . . . . . . . . 7-23

Analog Input (AI) Function Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23

Simulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26

Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27

Signal Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27

Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28

Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29

Advanced Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30

Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30

Application Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35

Proportional/Integral/Derivative (PID) Function Block. . . . . . . . . . . . 7-36

Setpoint Selection and Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . 7-40

Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41

Feedforward Calculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41

Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41

Output Selection and Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-41

Bumpless Transfer and Setpoint Tracking . . . . . . . . . . . . . . . . . . 7-41

PID Equation Structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-42

Reverse and Direct Action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-42

Reset Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-42

Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-42

Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44

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Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-44

Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45

Application Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-46

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-51

Arithmetic (ARTHM) Function Block . . . . . . . . . . . . . . . . . . . . . . . . . 7-52

Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-54

Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55

Block Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-55

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56

Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-56

Advanced Topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-57

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-59

Input Selector (ISEL) Function Block. . . . . . . . . . . . . . . . . . . . . . . . . 7-59

Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-61

Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-61

Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-62

Block Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-62

Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-62

Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-63

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-64

Operation with Emerson Process Management DeltaV . . . . . . . . . . 7-65

About AMS and DeltaV Software . . . . . . . . . . . . . . . . . . . . . . . . . 7-65

SECTION 8
Troubleshooting

SECTION 9
Maintenance and Service

SECTION 10
Replacement Parts

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Electrical Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Electrostatic Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Total Power Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Diagnostic Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

Alarm Relay Events. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

OCX 8800 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

OCX with Integral Electronics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

OCX with Remote Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5

Repair Sensor Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10

Sensor Housing Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10

Sensor Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20

Repair Electronics Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-29

Electronics Housing Disassembly . . . . . . . . . . . . . . . . . . . . . . . . 9-29

Electronics Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-31

Replace Tube Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-35

Remove Tube Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-35

Install Tube Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-36

Sensor Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2

Electronics Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6

O2 Cell and Heater Strut Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . 10-9

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OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

APPENDIX A
Safety Data

APPENDIX B
SPA with HART Alarm

APPENDIX C
Return of Materials

Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2

Safety Data Sheet for Ceramic Fiber Products . . . . . . . . . . . . . . . . .A-24

High Pressure Gas Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-30

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2

Returning Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

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Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Oxygen/Combustibles Transmitter

ESSENTIAL
INSTRUCTIONS

READ THIS PAGE BEFORE PROCEEDING!

Emerson Process Management designs, manufactures and tests its prod uct s
to meet many national and international standards. Because these
instruments are sophisticated technical prod ucts, you MUST properly inst all,
use, and maintain them to ensure they continue to operate within their
normal specifications. The following instructions MUST be adhered to
integrated into your safety program when installing, using, and maintaining
Emerson’s 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
product.

• If you do not understand any of the instructions, contact your
Emerson Process Management representative for clarification.

• Follow all warnings, cautions, and instructions
supplied with the product.

• Inform and educate your personnel in the proper installation,
operation, and maintenance of the product.

• Install your equipment as specified in the Installation Instructions

of the appropriate Instruction Manual and pe r a pplicable loca l and
national codes. Connect all products to the proper electrical and

pressure sources.

• To ensure proper performance, use qualified personnel
operate, update, program, and maintain the product.

• When replacement parts are required, ensure that qualified people use
replacement parts specified by Emerson Process Management.
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.

prior to installing, operating, and servicing the

marked on and

to install,

and

http://www..raihome.com

If a Model 375 Field Communicator is used with this unit, the software within the Model 375
may require modification. If a software modification is required, please contact your local
Emerson Process Management Service Group or National Response Center at
1-800-654-7768.

OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

ii

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Section i Introduction

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page iii

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page iii

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page iv

PREFACE The purpose of this manual is to provide a comprehensive understanding of

the OCX 8800 components, functions, installation , and maintenance.
We recommend that you thoroughly familiarize yourself with the Introduction

and Installation sections before installing your transmitter.
The introduction presents the basic principles of the transmitter along with its

performance characteristics and components. The remaining sections contain
detailed procedures and information necessary to install and service the
transmitter.

Before contacting Emerson Process Management concerning any questions,
first consult this manual. It describes most situations encountered in your
equipment's operation and details necessary action.

DEFINITIONS The following definitions apply to WARNINGS, CAUTIONS, and NOTES

found throughout this publication.

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 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

Highlights an essential operating procedure, condition, or statement.

http://www..raihome.com

OCX 8800

SYMBOLS

Instruction Manual

IM-106-880, Rev 2.0

September 2009

NOTE TO USERS

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.

NOTE

Read this manual before working with the product. For personal and system
safety, and for optimum product performance, make sure you thoroughly
understand the contents before installing, using, or maintaining this product.

iv

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Section 1 Description and Specifications

Component Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 1-1

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 1-3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-12

Product Matrix - OCX 8800 . . . . . . . . . . . . . . . . . . . . . . . . . page 1-14

COMPONENT
CHECKLIST

A typical OCX 8800 Oxygen/Combustibles Transmitter package should
contain the items shown in Figure 1-1.

Use the product matrix in Table 1-1 at the end of this section to verify your
order number. The first part of the matrix defines the model. The last part
defines the various options and features of the OCX 8800. Check the model
number against the transmitter features and options, making sure options
specified by this number are on or included with the unit. Use this complete
model number for any correspondence with Emerson Process Management.
A list of accessories for use with the OCX 8800 is provided in Table 1-2.

http://www..raihome.com

OCX 8800

Figure 1-1. Typical System Package

Instruction Manual

IM-106-880, Rev 2.0

September 2009

1. Instruction Manual

2. Field Communicator Package (optional)

3. Adapter Plate with Mounting Hardware and Gasket

4. Reference Air and Calibration Set (optional)

5. Blowback Hardware (optional)

6. OCX 8800 with Remote Electronics

7. OCX 8800 with Integral Electronics

1-2

Instruction Manual

IM-106-880, Rev 2.0
September 2009

SYSTEM OVERVIEW Scope

This Instruction Manual supplies details needed to install, startup, operate,
and maintain the OCX 8800. Signal conditioning electronics outputs a digit al
signal representing oxygen (O
information, plus additional details, can be accessed with the 375 Field
communicator or Emerson Process Management AMS softwar e. The optional
local operator interface (LOI) also provides a communications interface with
the electronics.

System Description

The OCX 8800 is designed to measure oxygen and combustible
concentrations in flue gas temperatures up to 2600°F (1427°C). Electrical
connections, power and communications are made through two 3/4 NP T ports
in the flameproof electronics enclosure using fittings and cables provided by
the customer. Cable installation must meet NEC, IEC and/or other applicable
national or local codes for Class I, Zone 1, Group IIB +H2 T3/T6 permanently
mounted equipment. The transmitter is close coupled to the process and
requires minimal sample conditioning requirements.

The equipment measures oxygen percentage by reading the voltage
developed across a heated electrochemical cell, which consists of a small
yttria-stabilized, zirconia disc. Both sides of the disc are coated with porous
metal electrodes. When operated at the proper temperature, the millivolt
output of the cell is given by the following Nernst equation:

OCX 8800

) and combustibles (COe) values. This

2

EMF = KT log10 (P

Where:

1. P

is the partial pressure of the oxygen in the mea sured gas on one side

2

of the cell.

is the partial pressure of the oxygen in the reference air on the

2. P

1

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.

When the cell is at operating temperature 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 OCX 8800 to provide
exceptional sensitivity at low oxygen concentrations.

1/P2

) + C

1-3

OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

The OCX 8800 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 metho ds,
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.

The OCX 8800 combustibles sensor is a catalytic sensor consisting of two
Resistance Devices (RTD). One RTD is the reference element covered with
an inert coating. The other RTD element is active, coated with a catalyst. As
the sample gases flow by the sensor, the combustible gases oxidize on the
surface of the active element. The oxidation that occurs produces heat and a
temperature rise in the active element. The temperature differ ence produces
a resistance relationship between the two elements that is directly
proportional to the concentration of combustibles in the sample gases.

The catalyst is specifically designed to detect carbon monoxide (CO), but the
sensor responds to other combustible gases. The sensor is calibrated using
CO, thus the output should be expressed in terms of CO. However, since the
sensor detects other combustible gases, the output cannot just be labeled
CO. The response of the sensor to other combustible gases gives an output
that is equivalent to the sensor detecting CO.

The term COe is used in this manual to describe the sensor output. This term
indicates that the sensor is calibrated in terms of CO, and that the sensor
output is equivalent to CO but not specific to CO.

Dilution air is provided to the COe sensor to ensure there is adequate oxygen
to fully oxidize any combustible gases regardless of the concentration of
oxygen in the process.

System Configuration

Transmitters are available in four lengths, giving the user the flexibility to use
a penetration appropriate to the size of the stack or duct. The length optio ns
are 18 in. (457 mm), 3 ft (0.91 m), 6 ft (1.83 m), or 9 ft (2.7 m). Probes are
available in three material options, 316L stainless steel, Inconel 600, and
ceramic to accommodate higher temperatures.

The electronics are contained in a separate housing from the sensors. When
the transmitter is configured with the integral electronics option the electronics
and sensor housings are mounted as a unit at the stack mounting flange.
When the transmitter is configured with the remote electronics option the
electronics are contained in a separate housing from the sensors. The
electronics housing may be mounted up to 150 feet from the sensor housing.

The electronics control both sensor temperatures and provide output signals
in one of two ways:

1. Individual 4-20 ma isolated outputs that are proportional to the
measured oxygen and combustibles co ncentrations. The oxygen ou tput
also contains HART communication.

2. Single FOUNDATION fieldbus output.

1-4

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

The power supply can accept voltages of 100 to 240 VAC and 50 to 60 Hz.
The electronics accepts millivolt signals generated by the sensors and
produces the outputs to be used by remotely connected devices. Refer to
Section 3, Configuration and Startu p for specific instructions upon initial
power up.

System Features

1. The O
concentration decreases.

2. HART or FOUNDA TION fieldbus communication is st andard. To use this
capability, you must have either:

a. Model 375 Field Communicator.
b. AMS software for the PC.

3. Oxygen cell and heater/thermocouple assembly are field replaceable.

4. Electronics are automatically configured for line voltages from 100 to
240 VAC.

5. An operator can calibrate and diagnostically troubleshoot the OCX 8800
in one of two ways:

a. LOI. The LOI is mounted to the end of the electronics module and

b. HART or FOUNDATION fieldbus interface. The OCX 8800's output

6. When the transmitter is configured without the LOI an operator must
calibrate and diagnostically troubleshoot the OCX 8800 using the HAR T
or FOUNDATION fieldbus Interface.

7. Optional Blowback System. The blowba ck sys tem pe rio dic ally blows
instrument air back through the sample line filter and out the sample
tube. This clears out particulate and keeps the sample line filter from
clogging.

cell output voltage and sensitivity increase as the oxygen

2

allows local communications with the electronics. Refer to Section 4,
Using the LOI, for more information.

line transmits a digital signal with the detected oxygen or
combustible levels encoded in a digital format. This infor mation can
be accessed through the following:

• Model 375 Field Communicator - The handheld field
communicator requires Device Description (DD) software specific
to the OCX 8800. The DD software will be supplied with many
Model 375 units, but can also be programmed into existing units
at most Emerson Process Management service offices. Refer to
Section 6, Field Communicator, for additional information.

• Personal Computer (PC) - The use of a personal computer
requires AMS software available from Emerson Process
Management.

• Selected Distributed Control Systems - The use of distributed
control systems requires input/output (I/O) hardware and AMS
software which permit HART or FOUNDATION fieldbus
communications.

1-5

OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

System Operation

Figure 1-2 shows the relationship between the components of the OCX 8800.
The sensors and the electronics are contained in separate housings. The
sensor housing and probe mounts to a duct or process wall so that the prob e
protrudes into the flue gas stream. An air powered eductor continuously pulls
samples of the process flue gas through the probe to a chamber in front of the
sensor housing where the sample passes the O
the COe sensor. Dilution air is prov ided to the COe sensor and reference air
to the O

sensor. After the gas sample flows past the O2 sensor and through

2

the COe sensor, it is drawn through the eductor where it mixes with the
eductor air and exits through exhaust back into the system. The electronics
housing contains the CPU and communication boards which convert the
sensor inputs into digital output signals. The CPU can also initiate and
perform calibrations. Three test gasses and instrument air can be turned on
and off by solenoids. Test gas flow to the sensors is regulated by a flow meter
between the electronics and sensor housings. Instrument air is separated into
eductor air , reference air , and dilutio n air . The instrument air solenoid does not
allow air flow until the heaters are up to temperature. This minimizes the
amount of sampled process flue gas being pulled into cold sensors causing
condensation.

sensor and continues on to

2

Figure 1-2. System Operation Diagram

COe

Combustibles

Sensor

Probe

Sample

Gas

Exhaust

O

Sensor

SENSOR

HOUSING

2

Eductor

Eductor Air

ELECTRONICS

Solenoids

Instrument Air

Flow Meter

7 scfh

Reference Air

HOUSING

CPU

COMM

Board

Power

Supply

Optional

Test Gas

Solenoid

Dilution Air

Low O

Test Gas

High O

Test Gas

CO

Test Gas

Instrument

Air

Flow Meter

50 cc/min.

(0.1 scfh)

2

2

39690001

1-6

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Handling the OCX 8800

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 OCX 8800 is designed for industrial application. Treat each component of the system
with care to avoid physical damage. The probe may contain components made from
ceramics, which are susceptible to shock when mishandled.

System Considerations

Prior to installing your OCX 8800, 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 component s, 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 1-3 shows a typical system wiring for a system with
integral electronics. Figure 1-4 shows a typical system wiring for a system
with remote electronics. Simplified installations for the OCX 8800 are shown
in Figure 1-5 and Figure 1-6. Figure 1-7 shows the dimensions for the
optional sample tube support. Figure 1-8 shows the dimensions for the
optional in-situ filters. Figure 1-9 shows the optional panel mounted blowback.

A source of instrument air is required at the OCX 8800 for reference air,
dilution air, and eductor air. Since the OCX 8800 is equipped with an in-place
calibration feature, provision should be made for connecting test gas tanks to
the OCX 8800 when it is to be calibrated.

NOTE

The electronics module is designed to meet Type 4X and IP66 and the
electronic components are rated to temperatures up to 185°F (85°C).

Retain packaging in which the unit arrived from the factory in case any
components are to be shipped to another site. This packaging has been
designed to protect the product.

1-7

Instruction Manual

IM-106-880, Rev 2.0

OCX 8800

Figure 1-3. Communication Connections and AMS Application - OCX 8800 with Integral Electronics

September 2009

Model 375

Field

Communicator

Customer’s Laptop

with AMS

AMS

Instrument

Air

OCX 8800 with

Integral Electronics

3 calibration
gas lines by
customer
[300 ft (91 m) max.)

Signal Output

(Twisted Pairs)

Termination in
Control Room

Figure 1-4. Communication Connections and AMS Application - OCX 8800 with Remote Electronics

38850003

OCX 8800

Sensor Housing

Instrument

Air

OCX 8800

Electronics Housing

3 calibration
gas lines by
customer
[300 ft (91 m) max.)

Signal Output

(Twisted Pairs)

Termination in

Control Room

Model 375

Field

Communicator

Customer’s Laptop

with AMS

AMS

38850004

1-8

Instruction Manual

IM-106-880, Rev 2.0
September 2009

Figure 1-5. Typical System Installation - Integral Electronics

OCX 8800

Gases

Stack

Test Gas

Flow Meter

Dilution

Air

Flow

Meter

Adapter

Plate

Duct

Figure 1-6. Ty pical System Installation - Remote Electronics

Gases

OCX 8800 with

ELECTRONICS

Pressure

Regulator

High O Test Gas

2

Low O Test Gas

2

CO Test Gas

Duct

INTEGRAL

Signal Outputs
(Twisted Pairs)

Line Voltage

Instrument Air

Supply

(Reference Gas)

37390063

OCX 8800 with

REMOTE

ELECTRONICS

Heater

Power Cable

[up to 150 ft (46 m)]

Signal Cable

[up to 150 ft (46 m)]

Stack

Dilution

Air

Flow

Meter

Test Gas

Flow Meter

Pressure

Regulator

High O Test Gas
Low O Test Gas
CO Test Gas

Signal Outputs
(Twisted Pairs)

Line Voltage

Instrument Air

Supply

(Reference Gas)

2

2

37390064

1-9

OCX 8800

Figure 1-7. Optional Sample Tube Support

Instruction Manual

IM-106-880, Rev 2.0

September 2009

1-10

Instruction Manual

IM-106-880, Rev 2.0
September 2009

Figure 1-8. Optional InSitu Filters

1/4-18 NPT

1.3

(33)

1/4-18 NPT

7.3

(186)

InSitu Stainless Steel or Hastolloy Filter

OCX 8800

2.0

(50)

4.0

(102)

1.8

(46)

InSitu High Surface Area Stainless Steel Filter

Figure 1-9. Optional Panel Mounted Blowback and Calibration/Reference Air Set (19” Rack or Wall Mount)

2.2

(55.9)

5.00

(127)

6.97

(177)

CALIBRATION/BLOWBACK

PANEL

OCX 8800

PROCESS ANALYTICAL DIVISION

1-440-914-1261

www.raihome.com

19.00 (482.6)

DILUTION GAS CAL GAS

16.5 (419.1)
Wall Mount

SET TO 55 PSIG BLOWBACK AIR

OCX88A: 35 PSIG
OCX88C: 45 PSIG

PRESSURE

REFERENCE AIR

PRESSURE

39930006

Wall Mount Hole Pattern

6.0 (152.4)

Wall Mount

39930007

1-11

OCX 8800

SPECIFICATIONS

Instruction Manual

IM-106-880, Rev 2.0

September 2009

Specifications

Range 0-1% to 0-40% O2, fully field selectable

Net O

2

Combustibles 0-1000 ppm to 0-5%, fully field selectable
Accuracy

Oxygen ± 0.75% of reading or 0.05% O2 (whichever is greater)
Combustibles ± 2% range

System Response to
Test Gas

Oxygen 10 sec T90
Combustibles 25 sec T90

Temperature Limits

Process 32° to 2600°F (0° to 1427°C)
Sensors Housing -40° to 212°F (-40° to 100°C), ambient
Electronics Housing -40° to 149°F (-40° to 65° C), ambient

Local Operator
Interface

Nominal and Approximate
Shipping Weights

18 in. (457 mm)
probe package

3 ft (0.91 m) probe
package

6 ft (1.83 m) probe
package

9 ft (2.74 m) probe
package

Housings Mounting ­Integral Electronics

Mounting and Mounting
Positions - Remote
Electronics

Sensors Housing Flange
Electronics Housing Wall/Pipe

Materials

Probes 316L stainless steel - 1300°F (704°C)

Enclosures Low-copper aluminum
Calibration Semi-automatic or automatic
Calibration Gas Mixtures

Recommended

(Ref. test gas bottles

kit #1A99119G04)
Calibration Gas Flow 7 scfh (3.3 l/m), regulated to 20 to 30 psi (138 to 207 kPa)
Reference Air 2 scfh (1 l/m), clean, dry instrument-quality air (20.95% O

Eductor Air 5 scfh (2.5 l/m), clean, dry, instrument-quality air 20.95% O2),

Dilution Air 0.1 scfh (0.05 l/m), clean, dry, instrument-quality air (20.95% O

-40° to 185°F (-40° to 85°C), internal - operating temperature of
electronics inside instrument housing, as read by HART or
FOUNDATION fieldbus

-40° to 158°F (-40° to 70°C), ambient
[At temperatures above 158°F (70°C) inside instrument housing,
the infrared keypad will cease to function, but the OCX 8800 will
continue to operate properly.]

54 lbs (20 kg)

55 lbs (20.5 kg)

57 lbs (21 kg)

59 lbs (22 kg)

Flange

Inconel 600 - 1832°F (1000°C)
Ceramic - 2600°F (1427°C)

0.4% O
8% O2, Balance N
1000 ppm CO, Balance Air

regulated to 35 psi (241 kPa)

regulated to 35 psi (241 kPa)

regulated to 35 psi (241 kPa)

, Balance N

2

Table continued on next page

2

2

),

2

)

2

1-12

Instruction Manual

IM-106-880, Rev 2.0
September 2009

OCX 8800

Specifications

Blowback Air (optional) Clean, dry, instrument-quality air (20.95% O2), regulated to 55 psi

(379 kPa)

Sensors Housing Type 4X, IP66 with fitting and pipe on reference exhaust port to

clean, dry atmosphere, two 3/4-14 NPT conduit ports

Electronics Housing Type 4X, IP66 with fitting and pipe on reference exhaust port to

clean, dry atmosphere, two 3/4-14 NPT conduit ports

Certifications

CUS

Electrical Noise EN 61326-1, Class A
Line Voltage Universal 100 to 240 VAC ±10%, 50 to 60 Hz, no switches or

jumpers required, 3/4-14 NPT conduit port
Pollution Degree 2
Over Voltage Category II
Relative Humidity 5 to 95% (non-condensing)
Isolated Output

Oxygen 4-20 mAdc, 950 ohm maximum, with HART or FOUNDATION

fieldbus capability only

Combustibles 4-20 mAdc, 950 ohm maximum (Not present with FOUNDATION

fieldbus)

Alarm Alarm output relay - dry contact, form C, 30mA, 30VDC capacity

Power Consumption 750 W maximum

NOTE
All static performance characteristics are with operati ng variables const ant. Specific ations subject t o change
without notice.

APPROVED

1-13

OCX 8800

Table 1-1. Prod uct Matrix - OCX 8800

OCX88A O2/Combustibles Transmitter

Code Probe Length and Material

00 No Probe or Exhaust Tube
11 18 in. (457 mm) 316 SST up to 1300°F (704°C)
12 3 ft (0.91 m) 316 SST up to 1300°F (704°C)
13 6 ft (1.83 m) 316 SST up to 1300°F (704°C)
14 9 ft (2.7 m) 316 SST up to 1300°F (704°C)
21 18 in. (457 mm) Inconel 600 up to 1832°F (1000°C)
22 3 ft (0.91 m) Inconel 600 up to 1832°F (1000°C)
23 6 ft (1.83 m) Inconel 600 up to 1832°F (1000°C)
24 9 ft (2.7 m) Inconel 600 up to 1832°F (1000°C)
31 18 in. (457 mm) Ceramic up to 2600°F (1427°C)
32 3 ft (0.91 m) Ceramic up to 2600°F (1427°C)

Code Probe Mounting Assembly

10 (ANSI 2 in. 150 lb) 6" dia. flange, 4.75" BC with 4 x 0.75" dia. holes - Standard O2 Cell

11 (ANSI 2 in. 150 lb ) 6" dia. flange, 4.75" BC with 4 x 0.75" dia. holes - High Sulfur O2 Cell
20 (DIN) 185 mm dia. flange, 145 mm BC with 4 x 18 mm dia. holes - Standard O2 Cell
21 (DIN) 185 mm dia. flange, 145 mm BC with 4 x 18 mm dia. holes - High Sulfur O2 Cell

Code Mounting Hardware - Stack Side

0 No Adapter Plate (“0” must be chose n under “Mounting Adapter - Probe Side” below)
1 New Installation - Square weld plate with studs
2 Model 218/240 Mounting Plate (with Model 218/240 Shield Removed)
3 Existing Model 218/240 Support Shield
4 Competitor’s Mount
5 Model 132 Adapter Plate

Code Mounting Hardware - Probe Side

0 No Adapter Plate
1 Probe Only (ANSI)
4 Probe Only (DIN)

Code Electronics Housing - NEMA 4X, IP66 HART Communications

H1 HART Communications - Basic Unit
H2 HART Communications - Local Operator Interface
H3 HART Communications - Calibration Solenoids
H4 HART Communications - Local Operator Interfac e and Calibration Solenoids

OCX88A 11 10 1 1 H3 06 Example

(1)

F1 Fieldbus Communications - Basic Unit
F2 Fieldbus Communications - Local Operator Interface
F3 Fieldbus Communications - Calibration Solenoids
F4 Fieldbus Communications - Local Operator Interface and Calibration Solenoids

Code Electronics Mount i ng

01 Integral to Sensor Housing Electronics
02 Split Architecture with no cable
03 Split Architecture with 6M (20 Ft.) cable
04 Split Architecture with 12M (40 Ft.) cable
05 Split Architecture with 18M (60 Ft.) cable
06 Split Architecture with 24M (80 Ft.) cable
07 Split Architecture with 30M (100 Ft.) cable
08 Split Architecture with 45M (150 Ft.) cable

Instruction Manual

IM-106-880, Rev 2.0

September 2009

1-14

Instruction Manual

IM-106-880, Rev 2.0
September 2009

Cont’d

Code In-Situ Filter

0 None
1 Stainless Steel
2 High Surface Area Stainless Steel

.3Hastelloy

Code

Accessories
0 None
2 Cal. Gas/Flow Rotometers & Ref. Gas Set
3 Cal. Gas/Flow Rotometers & Ref. Gas Set w/ Blowback

Cal. Gas/Flow Rotometers & Ref. Gas Set w/ Blo wback - Panel
4

Mounted

OCX88A 11 10 1 1 H3 06 0 0 Example

NOTES:

(1)

Provide details of the existing mounting plate as follows:

Plate with studs Bolt circle diameter, number, and arrangement of studs, stud thread, stud height above mounting plate.
Plate without studs Bolt circle diameter, number, and arrangement of holes, thread, depth of stud mounting plate with accessories.

OCX 8800

1-15

OCX 8800

Table 1-2. Accessories

Instruction Manual

PART NUMBER DESCRIPTION

1A99119H01 Oxygen test gas bottle; 0.4% O
1A99119H02 Oxygen test gas bottle; 8.0% O2, balance N
1A 99119H07 CO test gas bottle; 1000 ppm CO, balance air
1A99120H02 Regulator for Oxygen (may need 2)
1A99120H03 Regulator for CO test gas
1A99119G06 Wall mount bracket for test gas bottles
1A99119G05 Test gas regulators kit
1A99119G04 Test gas bottles kit

1A99292H01
4851B40G02 Wall or Pipe Mounting Kit
1A99784H02
6A00171G01 Power line filter kit

6A00288G01 Sample Tube Support, 18 in. (457 mm)
6A00288G02 Sample Tube Support, 3 Ft. (0.91 m)
6A00288G02 Sample Tube Support, 6 Ft. (1.83 m)
6A00288G04 Sample Tube Support, 9 Ft. (2.7 m)
6P00162H01 Flange Insulator

Moore Industries SPA for Low O
Calibration Status, and Unit Fail

375 Field Communicator with 12 Megabyte buffer,
model no. 375HR1EKLU

, balance N

2

Alarm, High COe Alarm,

2

IM-106-880, Rev 2.0

September 2009

2
2

1-16

Instruction Manual

IM-106-880, Rev 2.0
September 2009

Section 2 Installation

Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1

Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-8

Pneumatic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-13

Initial Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-24

Before installing this equipment, read the "Safety instructions for the wiring and installation
of this apparatus" in Appendix A: Safety Data. Failure to follow the safety instructions could
result in serious injury or death.

OCX 8800

MECHANICAL
INSTALLATION

The OCX88A can be installed in general purpose areas only. Do not install the OCX88A in
hazardous areas.

Selecting Location

1. The location of the OCX 8800 in the stack or flue is most 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 transmitter is positioned near
the center of the duct (40-60% insertion). Longer ducts may require
several transmitters since the oxygen and combustibles 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 the range of probe material used.
Figure 2-1 through Figure 2-5 provide mechanical installation
references. The ambient temperature inside the electronics housing
must not exceed 185°F (85°C).

2. Check the flue or stack for holes and air leakage. The presence of this
condition will substantially affect the accuracy of the oxygen and
combustibles readings. Therefore, either make the necessary repairs or
install the transmitter up stream of any leakage.

3. Ensure the area is clear of internal and external obstructions that will
interfere with installation and maintenan ce access to the unit. Allow
adequate clearance for the removal of the OCX 8800.

http://www..raihome.com

OCX 8800

Instruction Manual

IM-106-880, Rev 2.0

September 2009

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

Whenever a positive stack pressure exists at the installation site, be sure to connect all
pneumatic lines prior to installing the OCX 8800 in the stack or ductwork. Failure to connect
the pneumatic lines can allow the flow of contaminants into the OCX 8800 ports.

Installation

1. Ensure all components are available to install the OCX 8800.

2. The OCX 8800 may be installed intact as it is received.

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

4. Use the pipe or wall mounting hardware as shown in Figure 2-4 to
mount a remote electronics housing. Choose a location not to exceed
the length of the electronics cable ordered.

5. Ensure the conduits drop vertically from the OCX 8800 and the conduit
is routed below the level of the conduit ports on the housing to form a
drip loop. Drip loops minimize the possibility that moisture will damage
the electronics (Figure 2-5).

6. Where a positive stack pressure exists at the inst allation site, connect all
pneumatic lines prior to installing the OCX 8800 in the stack or
ductwork.

2-2

NOTE

If process temperatures will exceed 392°F (200 °C), use anti- s eize compou nd
on stud threads to ease future removal of the OCX 8800.

7. Insert sample and exhaust tubes through the opening in the mounting
flange and bolt the unit to the flange.

Uninsulated stacks or ducts may cause ambient temperatures in the electronics housing to
exceed 185°F (85°C) and damage the electronics.

8. If insulation is removed to access the duct for OCX 8800 mountin g ,
make sure to replace insulation afterward.