Instruction Manual
00809-0100-4891, Rev AA
Rosemount™ 6888C In-Situ Combustion
Oxygen Analyzer
For use in Hazardous Areas
July 2018
Instruction Manual
July 2018 00809-0100-4891
Essential instructions
Read this page before proceeding!
EmersonTM 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 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 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 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.
• Use only factory documented components for repair. Tampering and unauthorized substitution and parts can affect product
performance and cause unsafe operation of your process.
NOTICE
The Field Communicator must be upgraded to System Software 2.0 with graphic license for operation with the Rosemount
6888C O2 Transmitter. The AMS software must be upgraded to AMS 8.0 or above. Contact Emerson's Global Service Center (GSC)
at +1-800-833-8314 to upgrade the Field Communicator software to System Software 2.0 with graphic license.
Symbols
Earth (ground) terminal
Protective conductor terminal
Risk of electrical shock
Hot surface
Refer to reference manual.
The following definitions apply to Warnings, Cautions, and Notices found throughout this publication.
TM
WARNING
Highlights an operation or maintenance procedure, practice, condition, statement, etc., which 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., which if not strictly observed, could result
in damage to or destruction of equipment or loss of effectiveness.
NOTICE
Highlights an essential operating procedure, condition, or statement.
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WARNING
EXPLOSION
Do not open when an explosive atmosphere may be present.
WARNING
ELECTRIC SHOCK
Do not open while energized.
CAUTION
EQUIPMENT DAMAGE
For the standard housing probe and direct replacement probe, only use supply cables & certified cable glands rated > 105 °C (221
°F).
CAUTION
EQUIPMENT DAMAGE
For the autocal housing, only use supply cables and certified cable glands rated > 85 °C (185 °F).
Special conditions for safe use (ATEX) and conditions of acceptability (CSA)
1. The unit is to be connected to the supply mains by qualified personnel in accordance with local and national codes.
2. Mounting flange temperature shall not exceed 190 °C during combustion process.
3. The 6888C O2 Analyzers are used with the 6888 Xi Advanced Electronics (associated equipment not part of this certification)
which must be installed in a safe area.
4. Calibration air lines and reference air lines shall not contain pure oxygen or combustible gas other than inert/oxygen gas
mixture of which oxygen represents no more than that normally present in air.
5. The pressure within the enclosure and gas lines shall not be higher than 1.1 times the atmospheric pressure during the normal
operations of the equipment.
6. Fasteners property class must be A2-70 Stainless Steel
7. Flameproof joints are not intended to be repaired.
Safety instructions
IMPORTANT
SAFETY INSTRUCTIONS FOR THE WIRING AND INSTALLATION OF THIS APPARATUS
The following safety instructions apply specifically to all EU member states. They should be strictly adhered to in order to ensure
compliance with the Low Voltage Directive. Non-EU states should also comply with the following unless superseded by local or
national standards.
1. Adequate earth connections should be made to all earthing points, internal and external, where provided.
2. After installation or troubleshooting, all safety covers and safety grounds must be replaced. The integrity of all earth terminals
must be maintained at all times.
3. Main supply cords should comply with the requirements of IEC227 or IEC245.
4. All wiring shall be suitable for use in an ambient temperature of greater than 75 °C (167 °F).
5. All cable glands used should be of such internal dimensions as to provide adequate cable anchorage.
6. To ensure safe operation of this equipment, connection to the mains supply should only be made through a circuit breaker
which will disconnect all circuits carrying conductors during a fault situation. The circuit breaker may also include a
mechanically operated isolating switch. If not, then another means of disconnecting the equipment from the supply must be
provided and clearly marked as such. Circuit breakers or switches must comply with a recognized standard, such as IEC947. All
wiring must conform with any local standards.
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July 2018 00809-0100-4891
7.
Where equipment or covers are marked with the symbol to the right, hazardous
voltages are likely to be present beneath. These covers should only be removed
when power is removed from the equipment - and then only by trained service
personnel.
8.
Where equipment or covers are marked with the symbol to the right, there is a
danger of hot surfaces beneath. These covers should only be removed by trained
service personnel when power is removed from the equipment. Certain surfaces
may remain hot to the touch.
9.
Where equipment or covers are marked with the symbol to the right, refer to the
instruction manual for instructions.
10. All graphical symbols used in this product are from one or more of the following standards: EN61010, IEC417, and ISO3864.
11. Where equipment or labels are marked "Do Not Open While Energized" or similar, there is a danger of ignition in areas where
an explosive atmosphere is present. This equipment should only be opened when the power is removed and adequate time as
specified on the label or in the instruction manual has been allowed for the equipment to cool down - and then only by trained
service personnel.
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Instruction Manual Contents
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Contents
Chapter 1 General information.......................................................................................................7
1.1 Overview..........................................................................................................................................7
1.2 System configurations......................................................................................................................7
Chapter 2 Typical system package................................................................................................11
2.1 Rosemount 6888C Hazardous Area Probe product matrix..............................................................12
Chapter 3 Specifications...............................................................................................................15
3.1 Measurement specifications...........................................................................................................15
3.2 Environmental specifications..........................................................................................................16
3.3 Optional General Purpose 6888 Xi Electronics................................................................................ 16
3.4 Installation specifications - probe................................................................................................... 17
3.5 Installation specifications - Rosemount 6888 Xi with Rosemount 6888C Transmitter probe...........18
3.6 Installation specifications for traditional architechture Rosemount 6888 Xi for use with DR or
other probe..................................................................................................................................... 19
Chapter 4 Install...........................................................................................................................21
4.1 Mechanical installation...................................................................................................................21
4.2 Mounting the Rosemount 6888 Xi General Purpose Advanced Electronics..................................... 21
4.3 Electrical installation.......................................................................................................................25
4.4 Connecting the Hazardous Area Transmitter Probe to the Rosemount General Purpose 6888
Xi Electronics................................................................................................................................... 26
4.5 Connecting the Transmitter probe to the single-channel safe area Xi and flame safety interlock.... 28
4.6 Connecting the Transmitter probe with integral autocal to HART communications........................32
4.7 Connecting the Transmitter probe with integral autocal to FOUNDATION Fieldbus
communications..............................................................................................................................34
4.8 Connecting the traditional architecture to the direct replacement hazardous area
replacement probe (no electronics inside).......................................................................................40
4.9 Connecting the traditional architecture cable connections system to the direct replacement
probe...............................................................................................................................................42
4.10 Pneumatic installation..................................................................................................................44
™
Chapter 5 Power up..................................................................................................................... 47
5.1 Powering up the standalone Rosemount 6888 Transmitter probe (without Rosemount 6888 Xi)...47
5.2 Power up the Rosemount 6888 Transmitter with single/dual channel or single channel and
flame safety interlock Rosemount 6888Xi........................................................................................48
5.3 Power up the Rosemount 6888 direct replacement probe (no electronics inside) with
traditional architecture Rosemount 6888Xi..................................................................................... 48
5.4 Rosemount 6888Xi Quick Start Wizard...........................................................................................49
5.5 Re-initiating Rosemount 6888Xi wizard..........................................................................................49
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Contents Instruction Manual
July 2018 00809-0100-4891
Chapter 6 Calibration................................................................................................................... 51
6.1 Manual/semi-automatic calibration................................................................................................51
6.2 Fully automatic calibration............................................................................................................. 52
Chapter 7 HART® menu trees....................................................................................................... 57
Chapter 8 Maintenance and service..............................................................................................63
8.1 Overview........................................................................................................................................63
8.2 Maintenance intervals.................................................................................................................... 63
8.3 Repair.............................................................................................................................................64
Chapter 9 Replacement parts....................................................................................................... 79
Chapter 10 Service support............................................................................................................ 81
Appendix A Rosemount™ 6888 product certifications..................................................................... 83
A.1 European Directive information..................................................................................................... 83
A.2 Ordinary location certification........................................................................................................83
A.3 Installing equipment in North America...........................................................................................83
A.4 Rosemount™ 6888A In-Situ Oxygen Transmitter for General Purpose Locations............................. 83
A.5 Rosemount™ 6888C In-Situ Oxygen Transmitter for Hazardous Locations...................................... 84
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Instruction Manual General information
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1 General information
1.1 Overview
The 6888 is Rosemount's latest combustion flue gas oxygen analyzer. This product is
intended for measuring the flue gases resulting from any combustion process.
This product uses an in situ sensor, i.e., the sensor is placed at the end of the probe, and
the probe extends directly into the flue gas duct or stack at a given length. The sensor is
like a thermocouple, generating its own millivolt signal based on the difference between a
reference gas (ambient or instrument air - always 20.95% O2) and the flue gases being
measured. This manual covers the Rosemount 6888C, which is the hazardous area probe
version.
This probe can be configured as a blind stand-alone transmitter where HART® or
FOUNDATION Fieldbus™ communications can be used as a method of accessing the
electronics for setup, operation, and diagnostics or with one of several remote electronics
options, as noted below in System configurations on page 7. Wiring diagrams for each
of these configurations follow in Electrical installation on page 25.
There are several different arrangements of probes, electronics, and features that are
explained below and in the wiring diagrams.
1.2 System configurations
1.2.1 Hazardous Area Transmitter probe only
The Rosemount 6888 probe has the electronics in the blue housing that controls the
heater temperature and also amplifies the raw O2 millivolt signal to a linear 4-20 mA. The
4-20 mA signal lines can be run directly to the control room and also power the
transmitter electronics. As with most other Rosemount transmitters measuring pressure,
temperature, and flow, setup is conducted through HART communications via a Field
Communicator or Asset Management Solutions (AMS).
1.2.2
Standard housing Hazardous Area Transmitter probe with General Purpose Rosemount 6888 Xi Electronics
The Rosemount 6888 Xi Electronics serve as a local operator interface unit, with a back-lit
display and keypad. It is capable of two channels, serving two Rosemount 6888 probes.
The Rosemount 6888 Xi also carries these optional advanced features:
• Fully automatic calibration. Requires Rosemount 6888 Xi O2 Cal Auto calibration
system
• Loss of flame contact for powering down the heater in the event of a flame-out
condition in a furnace.
• Heaterless operation at process temperatures above 550 °C (1022 °F). This feature will
also permit operation above the heater setpoint of 736 °C (1357 °F). Sensing cell life
will be shortened by operation above 800 °C (1472 °F), however.
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General information Instruction Manual
July 2018 00809-0100-4891
• Plugged diffuser diagnostic operates by measuring the return-to-process rate after
calibration gas has been stopped. This feature also includes auto gas switching when
the reading settles out versus waiting for configured gas flow time to expire.
• Stoichiometer - If a furnace goes into a reducing condition (0% O2), this feature will
determine how far.
• Programmable reference - Permits more accurate readings at near-ambient O2 levels
(20.95% O2).
• A cal check capability. New calibration values are not automatically stored after a
calibration. An accept/reject calibration feature can be enabled or disabled so that the
technician or operator can decide to accept or reject a potentially large change in
calibration values.
• Tolerance check that will alarm if the wrong test gases are being used or if a bottle runs
out in the middle of a calibration. Care must be taken to ensure gas 1 and gas 2
calibration gases are properly configured if the tolerance check feature is enabled.
1.2.3
1.2.4
1.2.5
Hazardous Area Rosemount 6888C probe with General Purpose Rosemount Xi Electronics with flame safety interlock
A flame safety interlock by Emerson™ 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 Rosemount 6888 Xi
and is actuated via a dry contact input from the user's flame scanner. A closed contact
indicates a flame is present. An open contact indicates a loss of flame. This feature is also
available with the Integral autocal housing.
Hazardous Area Rosemount 6888C probe with Integral Autocal General Purpose Rosemount 6888 Xi Electronics
This probe contains gas-switching solenoids so that the Rosemount 6888 Xi Electronics
can control the introduction of calibration gases. Calibrations can be intiated via a
calibration recommended diagnostic, time since last calibration, manually via external dry
contact, HART communications, or from the Rosemount 6888 Xi local operator interface
keypad. The integral autocal feature can only be implemented when the probe is used
with a Rosemount 6888 Xi.
Hazardous Area Rosemount 6888C probe with Integral Autocal and Foundation Fieldbus (FF) communications
This probe contains gas-switching solenoids that can control the introduction of
calibration gases for calibration. Calibrations can be initiated automatically via a
calibration recommended diagnostic, time since last calibration, or manually via optional
Xi keypad, FF communications via the Field Communicator, or AMS console. Unlike the
HART transmitter electronics, the FF version can execute automatic calibrations either
with or without the optional Rosemount 6888 Xi Electronics. Likewise, advanced features
can be implemented either with or without the optional Xi.
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1.2.6 Hazardous Area Rosemount 6888C direct replacement (DR) probe with General Purpose Traditional Architecture Rosemount 6888 Xi Electronics
Here there are no electronics inside the probe head, so the raw sensor signals for the
heater thermocouple and zirconium oxide O2 sensor are sent to a remote Rosemount
6888 Xi Electronics. The Rosemount 6888 Traditional Architecture Electronics will also
directly apply power to the probe heater in order to maintain the correct sensor
temperature. This arrangement calls for a 7-conductor cable to carry this power and the
sensor signals. Maximum length for this cable is 200 feet. This probe will also operate on
previous Westinghouse/Rosemount electronics (World Class and Oxymitter), as well as
many competitive electronics.
WARNING
HAZARDOUS AREAS
Cables are supplied with Exd Rated Glands; the cable is not ExD rated, and installation in a
hazardous area is the responsibility of the installer/customer. Cables must be installed in
accordance with national and local electrical codes.
1.2.7
Wireless capability
Both the transmitter electronics in the head of the probe and the Rosemount 6888Xi
Electronics communicate over HART communications and can implement wireless
communications via Emerson Wireless 775 THUM™ Adapter.
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10 6888C
Instruction Manual Typical system package
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2 Typical system package
Figure 2-1: Typical System Package
A. Optional Rosemount SPS 4001B or Rosemount IMPS Autocalibration Sequencer
(Requires use of Rosemount 6888 Xi Advanced Electronics option)
B. Quick Start Guide
C. Optional mounting or adapter plate
D. Optional traditional architecture cable
E. HART® Field Communicator package (optional)
F. Optional reference & calibration gas accessories
G. Rosemount 6888C probe
H. Optional Rosemount 6888 XI Advanced Electronics
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Typical system package Instruction Manual
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2.1 Rosemount 6888C Hazardous Area Probe product matrix
Table 2-1: Rosemount 6888C Product Matrix
Model Description
Rosemount
6888C
Measurement
1OXY Oxygen, standard sensing cell
2OXY Oxygen, high sulfur resistant sensing cell
Probe length
1A 18-in. probe, 3-in. ANSI Class 150 flange
1D 18-in. probe, DIN flange
2A 3-ft probe, 3-in. ANSI Class 150 flange
2D 3-ft probe, DIN flange
3A 6-ft probe, 3-in. ANSI Class 150 flange
3D 6-ft probe, DIN flange
Diffuser
1 Snubber diffuser, 400 °C (572 °F) with process flame arrestors
2 Ceramic diffuser, 825 °C (1517 °F) with process flame arrestors
3 Alloy diffuser 705 °C (1301 °F) with both ambient and process flame arrestors
Housing and electronics
1HT Standard housing, transmitter electronics, HART communications
O2 Transmitter approved for hazardous locations
(1)
2HT Integral autocal, transmitter electronics, HART communications
4FF Integral autocal, transmitter electronics, FOUNDATION Fieldbus™ communications
5DR Standard housing, direct replacement, requires remote electronics
6DRY Standard housing, direct replacement, for use with YEW Electronics
Certifications
A ATEX/IECEx
C CSA
Mounting Plate
00 None
04 New installation - square weld plate with ANSI 2 in.(50.8 mm)- 150# studs and flange (2.5 in. (63.5
mm) process hole required)
05 New installation - square weld plate with DIN studs and flange (2.5 in. (63.5 mm) process hole
required)
08 Adapter to existing ANSI 3 in. (76.2 mm), 150# flange
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09 Adapter to existing ANSI 4 in. (101.6 mm), 150# flange
10 Adapter to existing ANSI 6 in. (152.4 mm), 150# flange
11 Adapter to existing ANSI 3 in. (76.2 mm), 300# flange
12 Adapter to existing ANSI 4 in. (101.6 mm), 300# flange
99 Special adapter - provide existing flange dimensions, including thru-hole diameter
Manual calibration accessories
00 None
01 Calibration and reference gas flowmeters and reference regulator/filter diffuser
02 Calibration/reference panel
Stoichiometer function
0 No
1 Yes
Programmable reference function
0 No
(2)
(2)
1 Yes
Extended temperature reference function
(2)
0 No
1 Yes
Diffuser warning function
(2)
0 No
1 Yes
(1) Flanges are flat-faced and for mounting only. Flanges are not pressure-rated.
(2) FOUNDATION Fieldbus only (for HART versions, order this feature with Rosemount 6888 Xi Electronics)
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14 6888C
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3 Specifications
3.1 Measurement specifications
3.1.1 Net O2 range
Variable 0 - 10% to 0-50% (Xi electronics of 0-50% range)
3.1.2 Accuracy in oxidizing condition
±0.75% of reading at 0.05% O2, whichever is greater. ±1% of full scale for 0-10% ranges and
above.
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
Lowest detectable limit
0.02% O
2
Process temperature effect
Less than 0.05% O2 from 100 to 700 °C (212 to 1292 °F)
System speed of response to calibration gas
Initial response in less than 3 seconds; T90 in less than 8 seconds. Response to process gas
changes varies depending on process gas velocity and particulate loading of the diffuser.
Calibration validity
Presentation of calibration gases matches the bottle value to within 0.02% O
2
Accuracy in reducing conditions (requires stoichiometer feature)
±10% of reading or 0.1% O2, whichever is different size
3.1.8
System response in reducing conditions (requires stoichiometer feature)
Going from oxidizing to reducing - T90 in 120 seconds
Going from reducing to oxidizing - T90 in 30 seconds
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Specifications Instruction Manual
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3.2 Environmental specifications
3.2.1 Transmitter probe
Process-wetted materials are 316L stainless steel.
3.2.2 Transmitter probe process temperature limits
0 to 705 °C (32 to 1300 °F)
550 to 825 °C (1022 to 1517 °F) with Xi heaterless operation feature
Optional bypass and jacket accessories permit operation to 1050 °C (1922 °F).
1
3.2.3
3.2.4
3.2.5
Probe electronics ambient temperature limits
-40 to 70 °C (-40 to 158 °F)
Temperature limit as measured inside probe electronics
-40 to 85 °C (-40 to 185 °F)
DR probe, no electronics inside, ambient temperature limits
-40 to 90 °C (-40 to 194 °F)
3.3 Optional General Purpose 6888 Xi Electronics
3.3.1 Material
NEMA® 4X, polycarbonate material
3.3.2
Rosemount 6888 Xi ambient temperature limits
-20 to -50 °C (-4 to 122 °F)
3.3.3
Rosemount 6888 Xi temperature limits as measured inside the electronics housing
-20 to 70 °C (-4 to 158 °F)
Reduced cell life can be expected if operated continuously at temperatures above 705 °C (1300 °F).
1.
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3.4 Installation specifications - probe
3.4.1 Probe mounting flange
Vertical or horizontal-3 in. 150 6 in. (152.4 mm) bolt circle
CAUTION
Flanges are flat-faced and for mounting only. Flanges are not pressure-rated. A 2.5 in.
(63.55 mm) diameter hole in the process is required.
Spool piece P/N 3D39761G02 is available to offset probe electronics housing from hot
ductwork.
Many adapter flanges are available to mate to existing flanges.
3.4.2
3.4.3
3.4.4
3.4.5
Probe lengths and approximate shipping weights
18 in. (457 mm) package: 16 lb (7.3 kg)
3 ft (0.91 m) package: 21 lb (9.5 kg)
6 ft (1.83 m) package: 27 lb (12.2 kg)
9 ft (2.74 m) package: 33 lb (15.0 kg)
12 ft (3.66 m) package: 39 lb (17.7 kg)
Reference air (optional)
Maximum 2 scfh (1 L/min), clean, dry, instrument-quality air (20.95% O2) regulated to 5 psi
(34 kPa)
Calibration
Semi-automatic or automatic
Cal gases
0.4% O2 and 8% O2 balance N2 recommended. Instrument air may be used as a high cal gas
but is not recommended. 100% nitrogen cannot be used as the low cal gas. No explosive
gases or gases with % O2 greater than that found in ambient air (i.e., 20.95% O2) can be
used.
3.4.6
3.4.7
Instruction Manual 17
Calibration gas flow
5 scfh (2.3 L/min) at 15 psi, maximum
Heater electrical power
120/240 V ±10%, 50/60 Hz, 1/2 in. - 14 NPT conduit ports
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3.4.8 Traditional architecture cable
200 ft (61 m) maximum length
3.4.9 Power consumption of transmitter probe/integral autocal probe
776 W maximum during warm-up
3.5 Installation specifications - Rosemount 6888 Xi with Rosemount 6888C Transmitter probe
3.5.1 Electrical power of optional Rosemount 6888 Xi Electronics
3.5.2
3.5.3
3.5.4
3.5.5
3.5.6
120/240 V ±10%, 50/60 Hz
Power consumption of Rosemount 6888 Xi
10 W maximum
Rosemount 6888 Xi alarm relays
2 provided- 2 amps, 20 Vdc
Rosemount 6888 Xi optional loss of flame contact
Removes heater power
Electrical noise
Meets EN 61326, Class A
Traditional architecture cable
200 ft (61 m) maximum length
3.5.7
18 6888C
Transmitter electrical 4-20 mA power
12 - 42 Vdc (looped-powered from the control room or from the Rosemount 6888 Xi box)
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3.6 Installation specifications for traditional architechture Rosemount 6888 Xi for use with DR or other probe
3.6.1 Power consumption of Rosemount 6888 Xi
120/240 V ±10%, 50/60 Hz, 260/1020 VA max for 120 V probes
120 V ±10%, 50/60 Hz, 450 VA max for 44 V probes
3.6.2 Alarm relay outputs
2 provided - 2 Amperes, 30 Vdc, Form-C
3.6.3
Optional loss of flame input
Internally powered input to remove heater power actuated via dry contact output form
proof of flame device.
Emerson has satisfied all obligations coming from the European legislation to harmonize
the product requirements in Europe.
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Install
4 Install
WARNING
Before installing this equipment, read the Essential Instructions at the front of this
Reference Manual. Failure to follow safety instructions could result in serious injury or
death.
WARNING
ELECTRIC SHOCK
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.
4.1 Mechanical installation
Most combustion processes run only slightly negative or positive in pressure, so that the
probe flange is for mechanical mounting only. The probe is not rated for high pressures. If
this is a new installation, a weld plate for welding to the flue gas duct can be supplied.
WARNING
ELECTRIC SHOCK
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.
4.2 Mounting the Rosemount 6888 Xi General Purpose Advanced Electronics
Follow the steps below to mount the Rosemount 6888 Xi.
The Rosemount 6888 Xi Advanced Electronics is available in a panel mounting or wall/pipe
mounting configuration. Refer to Figure 4-1 or Figure 4-2 for the panel, wall, or pipe
mounting details. The Rosemount 6888 Xi is rated for use in general purpose locations
only.
Ensure all components are available to install the Rosemount 6888 Xi.
1. Select a mounting location near or removed from the O2 Probe.
Consider the temperature limitations of the Rosemount 6888 Xi (see Rosemount 6888
Xi ambient temperature limits) when selecting the mounting location.
2. Mount the Roseount 6888 Xi at a height convenient for viewing and operating the
interface.
Approximately 5 ft (1.5 m) is recommended.
3. The keypad window on the Rosemount 6888 Xi may have interior and exterior
protective membranes. Remove the protective membranes prior to use of the
Rosemount 6888 Xi enclosure.
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CAUTION
EQUIPMENT DAMAGE
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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Install
Figure 4-1: Wall/surface mount and pipe mount
A. 4X cover screw
B. Front panel
C. 6X 1/2-in. NPT conduit openings
D. Mounting bracket
E. U-bolts
F. 2-in. pipe supplied by customer
Dimensions are in inches with millimeters in parentheses.
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Instruction Manual
Figure 4-2: Panel mount
A. Maximum panel thickness 0.375 (9.52)
B. Panel mount gasket
C. 4X mounting brackets and screws provided
D. 6X 1/2 in. NPT conduit openings
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Install
NOTICE
Dimensions are in inches with millimeters in parentheses.
NOTICE
The front panel is hinged at the bottom. The panel swings down for easy access to wiring
locations.
4.3 Electrical installation
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
ELECTRIC SHOCK
Disconnect and lock out power before connecting the power supply.
Install all protective covers and safety ground leads after installation. Failure to install
covers and ground leads could result in serious injury or death.
To meet the safety requirements of IEC 61010-1 (EC requirement) and ensure safe
operation of this equipment, connect the main electrical power supply through a circuit
breaker (min 10 A) which will disconnect all current-carrying conductors during a fault
situation. This circuit breaker should also include a mechanically operated isolating switch.
If not, keep another external means of disconnecting the supply from the equipment
located close by. Circuit breakers or switches must comply with a recognized standard
such as IEC 947.
WARNING
Before installing this equipment, read the Essential instructions at the front of this
instruction manual. Failure to follow safety instructions could result in serious injury or
death.
CAUTION
EQUIIPMENT DAMAGE
If external loop power is used, the power supply must be a safety extra low voltage (SELV)
type.
NOTICE
To maintain proper earth grounding, ensure a positive connection exists between the
transmitter housing and earth. The connecting ground wire must be 14 AWG minimum.
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Instruction Manual
NOTICE
Line voltage, signal, and relay wiring should be rated for at least 105 °C (221 °F).
NOTICE
If metal conduit is used with the Rosemount 6888 Xi, the conduit should be reliably
bonded to protective earth (PE). The grounding plate inside the Rosemount 6888 Xi is not
bonded to PE and does not provide adequate grounding.
4.4 Connecting the Hazardous Area Transmitter Probe to the Rosemount General Purpose 6888 Xi Electronics
The Rosemount 6888 Xi Electronics serve as an operator interface unit with a back-lit
display and keypad. It is capable of two channels, serving two Rosemount 6888 probes.
1. Remove cover screws from the front cover of the Rosemount 6888 Xi. Swing down the
front cover of the interface box.
2. Pull out the I/O board on the right side of the card rack inside the Rosemount 6888Xi.
If your system is configured to operate two transmitter probes, there are two I/O
interface boards.
3. See Figure 4-3. 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.
NOTICE
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 Rosemount 6888 Xi. 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.
6. Reinstall the I/O board at the card rack of the Rosemount 6888 Xi.
7. If your system is configured for two channel operation, repeat steps 2 through 6 to
connect the other probe's signal wires.
8. Remove the probe's connector from the power supply board located on the left-hand
side of the card rack inside the Rosemount 6888 Xi.
9. Connect the line, or L1, wire to the L1 terminal and the neutral, or L2, wire to the N
terminal.
10.Reinstall the power supply connector in the power supply board.
26 6888C
Instruction Manual
00809-0100-4891 July 2018
Install
Figure 4-3: Single/dual channel wiring diagram
NOTICE
1. Except for JP5, JP7, and JP8 on IO board, jumper and switch settings are factory set and are shown for reference only.
2. IO board 4-20 mA/HART® loop power settings
• JP5
— Pins 1-2: internal loop power Rosemount 6888 Xi to Rosemount 6888 Transmitter
— Pins 2-3: external power Rosemount 6888 Xi to Rosemount 6888 Transmitter (requires 2,500 resistor across
J4 PR+ to PR-)
• JP7/JP8
— Pins 1-2: internal power from Rosemount 6888 Xi to DCS
— Pins 2-3: external power Rosemount 6888 Xi to DCS
Instruction Manual 27
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