Emerson 6888Xi User Manual
6888Xi
Advanced Electronics for
Zirconium Oxide
Instruction Manual
51-6888Xi
December 2012
Flue Gas O
Probes
2
Essential Instructions
Read this page before proceeding
Emerson Process Management 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 with-
n their normal specifications. The following instructions MUST be adhered to and integrated into
i
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 Emerson Process Management
representative 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 maintenance of the
product.
• 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.
• 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 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.
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About this document
This manual contains instructions for installation and operation of the 6888Xi Advanced
Electronics. The following list provides notes concerning all revisions of this document.
Rev. Level Date Notes
A 12/2012 This is the initial release of the product manual. The manual
has been reformatted to reflect the Emerson documentation
style and updated to reflect any changes in the product offering.
II Table of Contents
888Xi Advanced Electronics Instruction Manual Table of Contents
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PN 51-6888Xi December 2012
Contents
Essential Instructions......................................................................................................I
Section i: Introduction
Preface..........................................................................................................................1
Definitions....................................................................................................................1
Symbols........................................................................................................................2
Overview......................................................................................................................2
Technical Support Hotline............................................................................................2
Section 1: Description and Specifications
1.1 Component Checklist...................................................................................................3
1.2 System Overview..........................................................................................................3
1.2.1 Power Supply –Current Loop Wiring...............................................................3
1.2.2 System Configurations....................................................................................4
1.2.3 Automatic Calibration.....................................................................................5
1.2.4 Communication Options.................................................................................6
1.3 Specifications ...............................................................................................................8
Section 2: Installation
2.1 System Considerations...............................................................................................12
2.2 Mechanical Installation...............................................................................................12
2.3 Electrical Installation ..................................................................................................15
Section 3: Configuration, Startup and Operation
3.1 Overview ...................................................................................................................25
3.2 Startup .......................................................................................................................25
3.2.1 Configuration................................................................................................26
3.2.2 Operation......................................................................................................26
3.2.3 Startup Display..............................................................................................26
3.2.4 Error Conditions............................................................................................27
3.2.5 Keypad..........................................................................................................27
3.2.6 Password Protection......................................................................................34
3.3 Optional Advanced Features. .....................................................................................34
3.3.1 Extended Temperature .................................................................................35
3.3.2 Stoichiometer................................................................................................35
3.3.3 Programmable Reference .............................................................................36
3.3.4 Plugged Diffusion Element Diagnostic..........................................................36
3.4 System Parameter Descriptions .................................................................................40
3.5 Probe Parameter Descriptions. ..................................................................................40
3.6 Operation Via HART/AMS ..........................................................................................40
3.6.1 Field Communicator Signal Line Connections...............................................48
3.6.2 Field Communicator Menu Trees ..................................................................48
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3.7 Parameter Setup ........................................................................................................48
3.7.1 Test Gas Values..............................................................................................48
3.7.2 Test Gas Times...............................................................................................53
3.7.3 Output Tracking During Calibration ..............................................................54
3.7.4 Tolerance Check............................................................................................54
3.7.5 Alarm Relay Output Configuration................................................................55
3.7.6 Analog Output Configuration....................................................................... 57
3.7.7 Autocalibration............................................................................................. 58
3.7.8 Calibration Recommended Setup. ............................................................... 58
3.7.9 Calibration Acknowledged Setup. ................................................................ 59
3.7.10 Plug Diffuser Diagnostic. ...............................................................................59
3.7.11 Low Temperature Set Point. ..........................................................................61
3.8 Calibration - General ..................................................................................................62
3.8.1 General..........................................................................................................62
3.8.2 Calibration Procedure ...................................................................................62
3.8.3 Calibration Log..............................................................................................67
3.8.4 Reset Calibration ...........................................................................................67
3.9 D/A Trim. ...................................................................................................................68
Section 4: Troubleshooting
4.1 Overview of Operating Principles...............................................................................71
4.2 General.......................................................................................................................72
4.2.1 Grounding.....................................................................................................72
4.2.2 Electrical Noise..............................................................................................72
4.2.3 Electrostatic Discharge..................................................................................72
4.3 Alarm Indications .......................................................................................................72
4.4 Identifying and Correcting Fault Indications...............................................................73
4.5 Calibration Passes, But Still Reads Incorrectly.............................................................74
4.5.1 Probe Passes Calibration, O2Still Reads High ................................................75
4.5.2 Probe Passes Calibration, O2Still Reads Low..................................................76
4.5.3 How do I detect a plugged diffuser?..............................................................76
4.5.4 Can I calibrate a badly plugged diffuser? .......................................................76
Section 5: Maintenance and Service
5.1 Overview....................................................................................................................79
5.2 Maintenance Intervals................................................................................................79
5.3 Calibration..................................................................................................................80
5.3.1 Automatic Calibration...................................................................................80
5.3.2 Manual Calibration........................................................................................80
5.4 Replacement Parts .....................................................................................................81
5.5 6888Xi Components Replacement ............................................................................81
5.5.1 I/O Board Replacement .................................................................................81
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5.5.2 AC Relay Board Replacement.........................................................................85
5.5.3 Power Supply Board Replacement.................................................................87
5.5.4 Front Panel Replacement...............................................................................88
5.5.5 DR Board Replacement..................................................................................90
Section 6: Replacement Parts
6.1 6888Xi Electronics .....................................................................................................93
6.2 Calibration Components............................................................................................93
Section 7: Optional Accessories
7.1 HART Handheld 375/475 Field Communicator .........................................................95
7.2 Asset Management Solutions (AMS)..........................................................................95
7.3 By-Pass Packages........................................................................................................95
7.4 SPS 4001B Single Probe Autocalibration Sequencer ..................................................96
7.5 IMPS 4000 Intelligent Multiprobe Test Gas Sequencer. ..............................................97
7.6 O2Calibration Gas. .....................................................................................................98
7.7 OxyBalance Display and Averaging System................................................................99
Appendix A: Safety Data
A.1 Safety Instructions ...................................................................................................100
Appendix C: Return of Material
B .1 Returning Material....................................................................................................122
Index ...........................................................................................................................................123
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VI Table of Contents
888Xi Advanced Electronics Instruction Manual Section i: Introduction
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PN 51-6888Xi December 2012
Section i: Introduction
Preface
The purpose of this manual is to provide information concerning components, functions, installation and maintenance of the 6888Xi Electronics. 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.
Definitions
The following definitions apply to WARNINGS, CAUTIONS, and NOTES
WARNING
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.
CAUTION
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.
Introduction 1
ection i: Introduction 6888Xi Advanced Electronics Instruction Manual
RISKOFELECTRICAL SHOCK
WARNING:REFER TOINSTRUCTIONMANUAL
PROTECTIVECONDUCT OR TERMINAL
EARTH(GROUND) TERMINAL
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Symbols
Overview
The 6888Xi is specifically designed to control a zirconium oxide probe for measuring oxygen,
usually the O2 remaining from a combustion process. Call the Rosemount Analytical Customer
Support Center (CSC) in Solon, Ohio, to get recommendations for other oxygen probes. 800433-6076 (US and Canada), or 440-914-1261 (International).
The 6888Xi electronics has several main functions:
1. Heater Control - The electronics receives a type K thermocouple input from an O2probe and
switches power on and off to the probe's heater in order to maintain a temperature setpoint
of 736 degrees C.
2. Signal Conditioning - The electronics receives the raw millivolt signal from the O2sensing
cell, then linearizes and amplifies the signal to provide a linear 4-20 mA output signal used
for recording or as an input into a DCS system for control purposes.
3. Calibration - A bottled calibration gas of known value is typically flowed into the probe's sensor to verify that it is reading correctly. If the signal is out of calibration, the calibration gas is
used to adjust the 4-20 mA output signal. During calibration the 6888Xi prompts the technician to flow two calibration gases into the probe and, with the calibration gases flowing,
automatically adjusts the O2signal. With the addition of a Single Probe Sequencer (SPS), the
6888Xi Advanced Electronics can also switch the calibration gases on and off.
4. Diagnostics - Multiple alarms are available for display. The alarm displays are intended to
assist a technician in locating where an instrument problem may reside.
The 6888Xi Advanced Electronics has been verified to operate the following probes:
• Westinghouse 218 and World Class
• Rosemount Analytical Oxymitter
• Yokogawa
Technical Support Hotline
For assistance with technical problems, please call the Customer Support Center (CSC).
Phone: 1-800-433-6076 1-440-914-1261
In addition to the CSC, you may also contact Field Watch. Field Watch coordinates Emerson
Process Management’s field service throughout the U.S. and abroad.
Phone: 1-800-654-RSMT (1-800-654-7768)
e-mail: GAS.CSC@emerson.com
2 Introduction
web: www.raihome.com
888Xi Advanced Electronics Instruction Manual Section 1: Description and Specifications
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PN 51-6888Xi December 2012
Section 1: Description and Specifications
1.1 Component Checklist
A typical Rosemount Analytical O2 Combustion Flue Gas Transmitter should contain the items
shown in Figure 1-1. A complete Oxygen Analyzer system will include some or all of the equipment shown. However, this manual describes item 8 only. Record the part number, serial number,
and order number for the 6888Xi Advanced Electronics in the table located on the back cover of
this manual.
Also, use the product matrix (Table 1-1) at the end of this section 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. Ensure the features and options specified by your order number are on or
included with the unit.
1.2 System Overview
1.2.1 Power Supply-Current Loop Wiring
This Instruction Manual is designed to supply details needed to install, start up, operate, and maintain the 6888Xi Advanced Electronics. Signal conditioning electronics outputs a 4-20 mA signal
representing an O2 value. This information, plus additional details, can be accessed with the handheld HART Model 375/475 Field Communicator or Asset Management Solutions (AMS) software.
Figure 1-1. Typical System Package
Quick Start
Manual
Optional 6888Xi
Advanced Electronics
Optional Mounting
or Adapter Plate
Full Instruction
Manual DVD
Optional Traditional
Architecture Cable
6888A
Probe
Optional Reference
& Calibration Gas
Accessories
Description and Specifications 3
ection 1: Description and Specifications 6888Xi Advanced Electronics Instruction Manual
6888A
6888Xi
Advanced
Electronics
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1.2.2 System Configurations
Integral Transmitter Electronics,
HART and 6888Xi Communications
The 6888Xi Advanced Electronics, Figure 1-2, provide a local display/keypad for setting up,
calibrating, and displaying O2, and for diagnosing probe problems. The 6888Xi also offers
additional features including a "Calibration Recommended" diagnostic, fully automatic
calibration, optional flame safety interface (single probe version only), extended process
temperature capability, stoichiometer, programmable reference, and plugged diffusor. These
additional features will be discussed in other sections of this manual. The 6888Xi can be
purchased to operate a single probe, or as a dual channel unit to run two probes.
Figure 1-2. 6888A with Integral Transmitter Electronics and
Optional 6888Xi Advanced Electronics
Traditional Architecture, HART and 6888Xi Communications
Some customers prefer not to mount electronics onto the probe, so a "traditional architecture"
version is offered. This probe sends raw millivolt signals via a 7-conductor cable to the 6888Xi
electronics, Figure 1-3, which does all heater control and signal conditioning in addition to its
display/keypad functions. The 6888Xi Advanced Electronics is offered to support direct replacement probes with 120 volt heaters.
4 Description and Specifications
6888Xi Advanced Electronics Instruction Manual Section 1: Description and Specifications
6888Xi
Advanced
Electronics
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PN 51-6888Xi December 2012
Figure 1-3. Direct Replacement Probe With Traditional Architecture Electronics
1.2.3 Automatic Calibration
Calibrations consist of introducing bottled gases of known value into the probe so the electronics can make automatic adjustments to the O2readings to match the bottled gas value. 0.4% O
and 8% O2(balance nitrogen) gases are recommended. Never use nitrogen or instrument air as
calibration gases.
Flowmeters (for calibration gases) and regulators and flowmeters (for reference air) are available
as loose components, mounted into an optional manual calibration switching panel, or as a fully
automatic calibration system, Figure 1-4, where calibration solenoids are switched from the
6888Xi Advanced Electronics. See IM-106-340AC, SPS 4000B Single Probe Autocalibration
Sequencer or IM-106-400IMPS, IMPS 4000 Intelligent Multiprobe Test Gas Sequencer, for additional details.
Figure 1-4. 6888A Probe with Optional 6888Xi Advanced Electronics
and Calibration Accessories
2
6888Xi
Advanced Electronics
Description and Specifications 5
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1.2.4 Communication Options
Data Communications
An operator can configure and troubleshoot the O2Probe system in one of two ways:
1. Using the 6888Xi Advanced Electronics keypad and display to access the following optional
advanced features:
• Probe configuration
• Fully automatic calibration
• Failure diagnostics
• Flame safety interface
• High temperature operation [above 700°C (1292°F) standard temperature].
• Stoichiometer feature provides the ability to indicate O
process goes into reducing conditions (0% O2).
• Programmable reference provides enhanced accuracy when measuring at or near O2level
(20.95% O2).
• Plugged diffusor diagnostics
2. Using the HART Interface. The 6888Xi’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:
• Rosemount Analytical Model 375/475 Field Communicator - The handheld communicator requires Device Description (DD) software specific to the 6888Xi. The DD software
will be supplied with many Model 375/475 units but can also be programmed into existing units at most Emerson Process Management service offices. See Section 4, Startup
and Operation, for additional information.
efficiency when the combustion
2
• Personal Computer (PC) - The use of a personal computer requires AMS software available
from Emerson Process Management.
• Delta V and Ovation Distributed Control System (DCS) with AMS-inside capability.
NOTE
The 375 Field Communicator must be upgraded to System Software 2.0 with Graphic License for
operation with the 6888Xi. The AMS software must be upgraded to AMS 8.0 or above.
Contact Emerson Process Management’s Global Service Center (GSC) at 1-800-833-8314 to upgrade
the 375 Field Communicator software to System Software 2.0 with Graphic License.
6 Description and Specifications
6888Xi Advanced Electronics Instruction Manual
AnalyticalAnalytical
PN 51-6888Xi December 2012
Section 1: Description and Specifications
3. The 6888Xi can also transmit HART information wirelessly via a wireless THUM Adapter,
Figure 1-5. The THUM Adapter threads into the
FIGURE 1-5. Wireless THUM Adapter
with 6888Xi
6888Xi conduit port and converts the 4-20 mA
O2 signal to a wireless protocol. All other HART
information is also transmitted.
In addition to the wireless THUM Adapter, a
hard-wire connection of the 4-20 mA signal to
the DCS may be used at the same time. More
detailed information regarding the application
of the THUM Adapter is available in Product
Data Sheet 00813-0100-4075.
Optional OxyBalance Display and Averaging System
Receives up to eight 4-20 mA signals from individual 6888Xi units. Trends individual outputs and
calculates four programmable averages as additional 4-20 mA outputs. OxyBalance graphic displays are shown in Figure 1-5. See IM-106-4050, OxyBalance Oxygen Display and Averaging
System, for additional details.
FIGURE 1-5. OxyBalance Displays
Description and Specifications 7
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1.3 Specifications
Measurement Specifications
Net O2Range: 0 to 50% O2user scalable
Lowest Detectable Limit: 0.01% O
ignal Stability: ±0.03% O
S
Accuracy in Reducing Conditions: ±10% of reading or 0.1% O
System Response in Reducing Conditions: going from oxidizing to reducing -T90 in 120 seconds
Ambient Temperature Effect on Xi 4-20 mA Signal: less than 0.0025% O2per degree Celsius
Environmental Specifications
6888Xi Advanced Electronics: Type 4X/IP66, Polycarbonate Material
Ambient Temperature Limits: -20°C to 50°C (-4°F to 122°F)
6888Xi LCD display:
Ambient Temperature Limits -20°C to 55°C (-4°F to 131°F)
General Purpose Certifications:
-2 to 50% O
user scalable with stoichiometer
2
2
2
2
going from reducing to oxidizing -T90 in 30 seconds
-20°C to 70°C (-4°F to 158°F) as measured by electronics
Installation Specifications
Mounting: Panel, wall, or pipe.
Reference Air: 2 scfh (1L /min), clean, dry, instrument-quality air
(20.95% O
), regulated to 5 psi (34 kPa)
2
Calibration: Semi-automatic or automatic
Cal Gases: 0.4% O
and 8% O2, balance N2 recommended
2
Traditional Architecture Cable 200 ft (61 m) maxmum length
Transmitter Electrical Power: 12 - 24 VDC (loop-powered from control room or 6888Xi)
Electrical Power for 6888Xi: 120/240VAC ±10%, 50/60 Hz
Power Consumption of 6888Xi: 12 VA maximum or 1020 VA maximum with Traditional
Architecture,120V Probes
Alarm Relay Outputs: Two provided - 2 Amperes, 30 VDC, Form-C
Optional Loss of Flame Input: Internally powered input to remove heater power
actuated via dry contact output from user’s* flame scanner
Emerson Process Management has satisfied all obligations from the European legislation to harmonize the product requirements in Europe. 1All static performance characteristics are with operating
variables constant. Specifications subject to change without notice.
8 Description and Specifications
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Table 1-1. Product Matrix, Advanced Electronics
6888Xi Advanced Electronics
Code Remote Type
1OXY Single Channel O2
2OXY Single Channel O2 with Flame Safety Interlock for Heater
3OXY Dual Channel O2
4OXY Single Channel O2, Traditional Architecture for 120V Probes
Code Mounting
00 No Hardware
01 Panel Mount Kit with Gasket
02 2" Pipe / Wall Mount Kit
Code Cable
00 No Cable
10 20' (6m) Cable
11 40' (12m) Cable
12 60' (18m) Cable
13 80' (24m) Cable
14 100' (30m) Cable
15 150' (45m) Cable
16 200' (60m) Cable
Code Stoichiometer Function
00 No
01 Single Channel
02 Dual Channel
Code Programmable Reference Function
00 None
01 Single Channel
02 Dual Channel
Code Extended Temperature Function
00 None
01 Single Channel
02 Dual Channel
Code Plugged Diffuser Diagnostic Function
00 None
01 Single Channel
02 Dual Channel
Description and Specifications 9
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December 2012 PN 51-6888Xi
Table 1-2. Product Matrix, O2Autocalibration Accessories
XS O2CAL O2 Autocalibration Accessories
Code Single Probe Sequencers Autocalibration Options
00 None
01 SPS 4001B Single Probe Sequencer, general purpose NEMA 4X, includes check valve for probe
Code Intelligent Multiprobe Sequencers (IMPS)
00 None
01 IMPS single-probe, general purpose NEMA 4X, includes check valve for probe
02 IMPS two-probe, general purpose NEMA 4X, includes check valve for probe
03 IMPS three-probe, general purpose NEMA 4X, includes check valve for probe
04 IMPS four-probe, general purpose NEMA 4X, includes check valve for probe
05 IMPS single-probe, 115V heated general purpose NEMA 4X, includes check valve for probe
06 IMPS two-probe, 115V heated general purpose NEMA 4X, includes check valve for probe
07 IMPS three-probe, 115V heated general purpose NEMA 4X, includes check valve for probe
08 IMPS four-probe, 115V heated general purpose NEMA 4X, includes check valve for probe
09 IMPS single-probe, 220V heated general purpose NEMA 4X, includes check valve for probe
10 IMPS two-probe, 220V heated general purpose NEMA 4X, includes check valve for probe
11 IMPS three-probe, 220V heated general purpose NEMA 4X, includes check valve for probe
12 IMPS four-probe, 220V heated general purpose NEMA 4X, includes check valve for probe
TABLE 1-3. Calibration Glass
Part Number Description
1A99119G01 Two disposable calibration gas bottles - 0.4% and 8% O2, balance nitrogen - 550 liters each*
1A99119G02 Two flow regulators for calibration gas bottles
1A99119G03 Bottle rack
*Calibration gas bottles cannot be shipped via airfreight.
10 Description and Specifications
888Xi Advanced Electronics Instruction Manual Section 2: Installation
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PN 51-6888Xi December 2012
Section 2: Installation
WARNING
Before installing this equipment read the "Safety instructions for the wiring and
installation ofthis apparatus" at the front of this Instruction Manual. Failure to
follow safety instructions could result in serious injury or death.
WARNING
Install all protective equipment covers and safety ground leads after installation. Failure to install covers and ground leads could result in serious injury or
death.
WARNING
The 6888Xi Advanced Electronics can be installed in general purpose areas
only. Do not install the 6888Xi in hazardous areas or in the vicinity of flammable liquids.
CAUTION
If external loop power is used, the power supply must be a safety extra low voltage (SELV) type.
Installation 11
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2.1 System Considerations
A typical system installation for a 6888Xi and O2 Probe is shown in Figure 2-1.
FIGURE 2-1. Typical System installation
2.2 Mechanical Installation
6888Xi Advanced Electronics
The 6888Xi Advanced Electronics is available in a panel mounting, wall mounting, or pipe
mounting configuration. Refer to Figure 2-2 or Figure 2-3 for the panel, wall, or pipe mounting
details.
1. Ensure all components are available to install the 6888Xi.
2. Select a mounting location near or removed from the O2 Probe. Consider the temperature
limitations of the 6888Xi (see "Specifications") when selecting the mounting location.
3. Mount the 6888Xi at a height convenient for viewing and operating the interface.
Approximately 5 ft (1,5 m) is recommended.
4. The keypad window on the 6888Xi may have interior and exterior protective membranes.
Remove the protective membranes prior to use of the 6888Xi enclosure. Failure to remove
the protective membranes may cause the display to appear distorted. The membrane may
be difficult or impossible to remove after extended use at elevated temperatures.
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888Xi Advanced Electronics Instruction Manual Section 2: Installation
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PN 51-6888Xi December 2012
FIGURE 2-2. 6888XI Advanced Electronics - Panel Mounting Details
Installation 13
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FIGURE 2-3. 6888XI Advanced Electronics - Wall/Surface and Pipe Mounting Details
14 Installation
888Xi Advanced Electronics Instruction Manual Section 2: Installation
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PN 51-6888Xi December 2012
2.3 Electrical Installation
6888Xi Advanced Electronics
All wiring must conform to local and national codes. Multiple wiring diagrams are shown in this
section. Always refer to the diagrams that apply to your transmitter configuration and disregard
all other wiring diagrams.
WARNING
Disconnect and lock out power before connecting the power supply.
WARNING
Install all protective covers and safety ground leads after installation. Failure to install covers and
ground leads could result in serious injury or death.
WARNING
To meet the Safety Requirements of IEC 1010 (EC requirement), and ensure safe operation of this
equipment, connection to the main electrical power supply must be made through a circuit breaker
(min 10A) which will disconnect all current-carrying conductors during a fault situation. This circuit
breaker should also include a mechanically operated isolating switch. If not, then another external
means of disconnecting the supply from the equipment should be located close by. Circuit breakers or
switches must comply with a recognized standard such as IEC 947.
NOTE
Line voltage, signal, and relay wiring must be rated for at least 105°C (221°F).
NOTE
If metal conduit is used with the 6888Xi the conduit should be reliably bonded to protective
earth. The grounding plate inside the 6888Xi is not bonded to PE and does not provide adequate
grounding.
1. Remove cover screws from the front cover of the 6888Xi. Swing down the front cover of the
interface box.
2. Pull out the I/O board on the right-hand side of the card rack inside the 6888Xi. If your system is configured to operate two transmitter probes there are two I/O interface boards.
3. See Figures 2-5, 2-6 and 2-7. Connect the 4-20 mA signal wires at J4 of the I/O board. Attach
the supplied ferrite clamp over the 4-20 mA OUT wires that extend past the shield.
NOTE
Installation of the ferrite clamp over the 4-20 mA OUT wires is required for compliance with the
European EMC Directive.
4. Terminate the shield of the 4-20 mA signal wires at the designated ground terminal of the
6888Xi. Do not allow bare shield wires to contact the circuit boards. Insulate the shield wires
prior to termination.
5. Connect the signal wires from the SPS or IMPS (if used) to the applicable terminals of J3.
Refer to the SPS or IMPS instruction manual for wiring details.
Installation 15
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December 2012 PN 51-6888Xi
6. Connect the customer’s alarm indicator devices to the alarm indicator relay terminals.
. Reinstall the I/O board in the card rack of the 6888Xi.
7
8. If your system is configured for two channel operation, repeat steps 2 through 7 to connect
the other signal wires.
9. Remove the connector from the power supply board located on the left-hand side of the
card rack inside the 6888Xi.
10. Connect the line, or L1 wire to the L1 terminal and the neutral, or L2 wire, to the N terminal.
11. Reinstall the power supply connector in the power supply board.
Flame Safety Interlock
A flame safety interlock by Emerson Process Management is available for heater power disconnect whenever there is a loss of the process flame or a heater runaway condition (heater overtemperature) in the O2 Probe. This input is internally powered by the 6888Xi and is actuated via
a dry contact output from the user’s flame scanner. A closed contact indicates a flame is present. An open contact indicates a loss of flame.
1. Connect the signal wires from the burner management system flame status output to the
flame status input terminals of J2. The flame status sensing device is supplied by the customer. Refer to the applicable OEM documents for signal wiring details.
2. Remove the J1 and J2 connectors from the AC relay board.
3. Connect the AC line input to the J1 connector.
4. Connect the AC power to the 6888A probe to the J2 connector.
5. Reinstall connector J1 and J2 to the AC relay board.
Traditional Architecture Cable Connections
A traditional architecture configuration is used to provide for remote location of the transmitter
electronics. All electronics are housed inside the 6888Xi. A multi-conductor power/signal cable
connects between the probe and the 6888Xi. Use the following procedure to connect the traditional architecture probe to the 6888Xi.
NOTE
The Traditional Architecture cable is provided at the specified length and is ready for installation. The cable
glands must be properly terminated to maintain EMC/EMI noise protection.
FIGURE 2-4. Traditional Architecture Cable Gland Assembly
1. Run the 7-conductor cable between the traditional architecture probe and the installation
site for 6888Xi.
Use new cable conduit or trough as needed.
2. Install the cable and lead wires to the probe per manufacturer’s instructions.
3. Install the cable at the probe housing and at the 6888Xi enclosure according to the follow-
ing procedure:
a. Unscrew locking nut from gland assembly, Figure 2-4, and slide locking nut back along
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cable.
b. Pull the gland body away from the plastic insert. Use care not to damage the cable
shield braid.
c. Insert the cable wires into the proper entry port in either the probe housing or the
6888Xi enclosure.
d. At the probe housing, apply Teflon tape or similar sealing compound to the tapered
pipe threads. Thread the gland body into the probe housing until properly seated.
e. At the 6888Xi enclosure, insert the gland body into the left front cable port from the
inside of the enclosure. Use the rubber O-ring provided to seal the cable port.
f. Ensure the cable shield braid is evenly formed over the gray insert. When properly
formed, the braid should be evenly spaced around the circumference of the insert and
not extend beyond the narrow diameter portion.
g. Carefully press the gray insert into the gland body. The grooves on the insert should
align with similar grooves inside the gland body. Press the insert in until it bottoms out
in the gland body.
h. Slide the locking nut up and thread it onto the gland body. Tighten the locking nut so
the rubber grommet inside the plastic insert compresses against the cable wall to provide an environmental seal.
4. At the 6888Xi, connect the cable leads to the connectors on the transmitter I/O board as
indicated in Figure 2-7.
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FIGURE 2-5. Single/Dual Channel Wiring Diagram
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FIGURE 2-5 cont. Single/Dual Channel Wiring Diagram
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IGURE 2-6. Single Channel with Flame Safety Wiring Diagram
F
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IGURE 2-6 cont. Single Channel with Flame Safety Wiring Diagram
F
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IGURE 2-7. Traditional Architecture Wiring Diagram
F
22 Installation
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