Rosemount OCX 8800 User manual

Instruction Manual
IM-106-880, Rev 2.1
April 2017
RosemountTM OCX 8800
Oxygen and Combustibles Transmitter
General Purpose Probe with Integral Electronics

HIGHLIGHTS OF CHANGES
Effective September 2009, Rev 2.0
Page/Section Summary
Throughout IM Included coverage of all General Purpose OCX 8800 configurations/options into this single
Instruction Manual.
Added FOUNDATION Fieldbus communications option.
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.
Added coverage of PlantWeb Alert data for OCX 8800 units with FOUNDATION Fieldbus
communications.
Added Appendix B coverage of optional Moore Industries Site Pprogrammable Alarm for
OCX 8800 units with HART communications.
Effective April 2017, Rev 2.1
Page/Section Summary
Title page Removed Rosemount Analytical logo.
Updated Emerson logo.
Page 1-13Updated Blowback Air specification.
Page 1-11 Updated specifications for Sensor Housings and Electronics Housings.
Page C-1 Updated Return of Materials information.
Back page Updated to include new addresses, social media information, and Rosemount and Emerson
logos.

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
Table of Contents
Essential Instructions................................................................................i
SECTION i
Introduction Preface.................................................................................................... iii
Definitions ............................................................................................... iii
Symbols .................................................................................................. iv
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
SECTION 1
Description and
Specifications
Component Checklist............................................................................1-1
System Overview..................................................................................1-3
Specifications......................................................................................1-12
SECTION 2
Installation Mechanical Installation..........................................................................2-1
Electrical Installation .............................................................................2-8
Pneumatic Installation.........................................................................2-13
Initial Startup.......................................................................................2-24
SECTION 3
Configuration and
Startup
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 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
SECTION 5
Calibration 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

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
TOC-2
SECTION 6
Field Communicator 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
SECTION 7
Foundation Fieldbus 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

Instruction Manual
IM-106-880, Rev 2.1
April 2017
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 DeltaV..........................................................7-65
About AMS and DeltaV Software...................................................7-65
SECTION 8
Troubleshooting 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
SECTION 9
Maintenance and Service 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
SECTION 10
Replacement Parts Sensor Housing...................................................................................10-2
Electronics Housing ............................................................................10-6
O2 Cell and Heater Strut Assembly....................................................10-9
TOC-3

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
TOC-4
APPENDIX A
Safety Data Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Safety Data Sheet for Ceramic Fiber Products . . . . . . . . . . . . . . . . . A-24
High Pressure Gas Cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-30
APPENDIX B
SPA with HART Alarm Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
APPENDIX C
Return ofMaterials Returning Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
ESSENTIAL
INSTRUCTIONS
Oxygen/Combustibles Transmitter
READ THIS PAGE BEFORE PROCEEDING!
Emerson 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 Emerson’s Rosemount
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 servicingthe
product.
• If you do not understand any of the instructions, contact your
Emerson representative forclarification.
• Follow all warnings, cautions, and instructions marked onand
supplied with the product.
• Inform and educate your personnel in the proper installation,
operation, and maintenance of theproduct.
• Install your equipment as specified in the Installation Instructions
of the appropriate Instruction Manual and per applicable local and
national codes. Connect all products to the proper electrical and
pressure sources.
• Toensure proper performance, use qualified personnel to install,
operate, update, program, and maintain theproduct.
• When replacement parts are required, ensure that qualified people use
replacement parts specified by Emerson. 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
improperoperation.
• 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 personalinjury.
The information contained in this document is subject to change without
notice.
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 Service Group or National Response Center at
1-800-654-7768.

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
ii

Instruction Manual
IM-106-880, Rev 2.1
April 2017
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 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.
NOTE
Highlights an essential operating procedure, condition, or statement.
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.

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
iv
SYMBOLS
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.

Instruction Manual
IM-106-880, Rev 2.1
April 2017
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. A list of accessories for
use with the OCX 8800 is provided in Table 1-2.

Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
1-2
Figure 1-1. Typical System Package
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

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Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
SYSTEM OVERVIEW Scope
This Instruction Manual supplies details needed to install, startup, operate,
and maintain the OCX 8800. Signal conditioning electronics outputs a digital
signal representing oxygen (O2) and combustibles (COe) values. This
information, plus additional details, can be accessed with the 375 Field
communicator or Emerson AMS software. 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 3/4NPT 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 conditioningrequirements.
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:
EMF = KT log10 (P1/P2) + C
Where:
1. P2 is the partial pressure of the oxygen in the measured gas on one side
of the cell.
2. P1 is the partial pressure of the oxygen in the reference air on the
opposite side of the cell.
3. T is the absolutetemperature.
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.

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Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
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 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.
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 difference 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 options
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 mountingflange.
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 concentrations. The oxygen output
also contains HARTcommunication.
2. Single FOUNDATION fieldbusoutput.

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Instruction Manual
IM-106-880, Rev 2.1
April 2017
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 Startup for specific instructions upon initial
power up.
System Features
1. The O2 cell output voltage and sensitivity increase as the oxygen
concentration decreases.
2. HARTor FOUNDATION fieldbuscommunicationis standard.Touse this
capability, you must haveeither:
a. Model 375 FieldCommunicator.
b. AMS software for the PC.
3. Oxygen cell and heater/thermocouple assembly are fieldreplaceable.
4. Electronics are automatically configured for line voltages from 100to
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
allows local communications with the electronics. Refer to Section 4,
Using the LOI, for more information.
b. HART or FOUNDATION fieldbus interface. The OCX 8800's output
line transmits a digital signal with the detected oxygen or
combustible levels encoded in a digital format. This informationcan
be accessed through thefollowing:
• 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 service offices. Refer to Section 6, Field
Communicator, for additionalinformation.
• Personal Computer (PC) - The use of a personalcomputer
requires AMS software available from Emerson.
• Selected Distributed Control Systems - The use of distributed
control systems requires input/output (I/O) hardware andAMS
software which permit HART or FOUNDATION fieldbus
communications.
6. When the transmitter is configured without the LOI an operator must
calibrate and diagnostically troubleshoot the OCX 8800 using the HART
or FOUNDATION fieldbusInterface.
7. Optional Blowback System. The blowback system periodically 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.

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Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
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 probe
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 O2 sensor and continues on to
the COe sensor. Dilution air is provided to the COe sensor and reference air
to the O2 sensor. After the gas sample flows past the O2 sensor and through
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 bysolenoids. Testgas flow to the sensors is regulated bya flow meter
between the electronics and sensor housings. Instrument air is separated into
eductor air, reference air, and dilution 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.
Figure 1-2. System Operation Diagram
Low O
Test Gas
2
COe
Combustibles
Sensor
O
Sensor
2
Eductor
Probe
Exhaust
CPU
COMM
Board
Optional
Test Gas
Solenoids
Instrument Air
Solenoid
High O
Test Gas
2
CO
Test Gas
Instrument
Air
Dilution Air
Reference Air
Eductor Air Flow Meter
50 cc/min.
(0.1 scfh)
SENSOR
HOUSING ELECTRONICS HOUSING
Flow Meter
7 scfh
39690001
Sample
Gas
Power
Supply

1-7
Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
Handling the OCX 8800
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 systemfunctional.
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 1-3 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 (when
reference air vents are routed to a dry area) 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.
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.

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Instruction Manual
IM-106-880, Rev 2.1
April 2017
OCX 8800
Figure 1-3. Communication Connections and AMS Application - OCX 8800 with Integral Electronics
OCX 8800 with
Integral Electronics
Model 375
Field
Communicator
Signal Output
(Twisted Pairs)
Customer’s
Laptop with AMS
Instrument
Air
3 calibration
gas lines by
customer
[300 ft (91 m) max.)
Termination in
Control Room
AMS
Figure 1-4. Communication Connections and AMS Application - OCX 8800 with Remote Electronics
OCX 8800
Sensor Housing Model 375
Field
Communicator
Signal Output
(Twisted Pairs)
OCX 8800
Electronics Housing
Customer’s
Laptop with AMS
Instrument
Air Termination in
Control Room
3 calibration
gas lines by
customer
[300 ft (91 m) max.)
AMS
38850004
38850003