Emerson Rosemount 6888C Bedienungsanleitung
Instruction Manual
00809-0100-4891, Rev AA
July 2018
Rosemount™ 6888C In-Situ Combustion
Oxygen Analyzer
For use in Hazardous Areas
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 RosemountTM
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.
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.
Instruction Manual
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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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Instruction Manual 3
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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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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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
Contents Instruction Manual
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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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Instruction Manual 7
•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 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 over-
temperature) 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.
1.2.4 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.
1.2.5 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.
General information Instruction Manual
July 2018 00809-0100-4891
8 6888C
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.
Instruction Manual General information
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Instruction Manual 9
General information Instruction Manual
July 2018 00809-0100-4891
10 6888C
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