Emerson Rosemount 6888A User manual

Quick Start Guide
00825-0100-4890, Rev AC
October 2022
Rosemount™ 6888A
In Situ Oxygen Analyzer

Safety instructions
WARNING
Follow installation guidelines.
Failure to follow these installation guidelines could result in death or serious injury. If this equipment is
used in a manner not specified by the manufacturer, the protection it provides against hazards may be
impaired.
Follow all warnings, cautions, and instructions marked on and supplied with the product.
Install equipment as specified in this document.
Ensure that only qualified personnel perform the installation, operation, and maintenance of the
product.
Inform and educate your personnel in the proper installation, operation, and maintenance of the
product.
Follow appropriate local and national codes.
If you do not understand any of the instructions, contact your Emerson representative for
clarification.
WARNING
Explosions
Do not open when an explosive atmosphere may be present.
WARNING
Electrical shock
Do not open while energized.
WARNING
Connect all devices to the proper electrical and pressure sources.
WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end
users’ equipment. This could be intentional or unintentional and needs to be protected against.
Physical security is an important part of any security program and fundamental to protecting your
system. Restrict physical access by unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
CAUTION
For the standard housing probe and direct replacement probe, only use supply cables and certified
cable glands rated >105 °C.
For the autocalibration housing, only use supply cables and certified cable glands rated > 85 °C.
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NOTICE
Use only factory documented components for repair. Tampering or unauthorized substitution of parts
and procedures can affect the 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 6888A Analyzer. The AMS software must be upgraded to AMS 8.0 or above.
Contact Emerson's Global Service Center (GSC) at [phone] 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
Refer to reference manual.
Contents
Installation................................................................................................................................... 5
Configuration, start-up, and operation.......................................................................................34
Product certifications................................................................................................................. 41
Declaration of Conformity..........................................................................................................44
China RoHS table........................................................................................................................46
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1 Installation
CAUTION
Equipment damage
If external loop power is used, the power supply must be a safety extra low
voltage (SELV) type.
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1.1 Install probe
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
Electrical shock
Failure to install covers and ground leads could result in serious injury or
death.
Install all protective covers and ground leads after installation.
WARNING
Hazardous areas
The analyzer can be installed in general purpose areas only.
Do not install the analyzer in hazardous areas or in the vicinity of flammable
liquids.
Procedure
1. Ensure all components are available to install the probe.
If using the optional ceramic or Hastelloy diffusion element, make
sure to orient the vee deflector correctly.
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2. Before inserting the probe, check the direction of gas flow in the
duct. Orient the vee deflector so the apex points upstream toward
the flow.
See Figure 1-1.
Figure 1-1: Orienting the optional vee deflector
A. Gas flow direction
B. Vee deflector
C. Diffusion element
D. Set screw
E. Vee deflector
F. Filter
G. Apex
3. If using the standard square weld plate or an optional flange
mounting plate, weld or bolt the plate onto the duct.
The through hole diameter in the stack or duct wall and refractory
material must be at least 2.5 in (64 mm).
NOTICE
Emerson recommends an abrasion-resistant probe tube or
traditional abrasive shield for high velocity particulates in the flue
stream (such as those in coal -fired boilers, kilns, and recovery
boilers). Vertical and horizontal brace clamps are provided for 9 ft
(2.74 m) through 12 ft (3.66 m) probes to provide mechanical
support for the probe.
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Figure 1-2: Rosemount 6888A probe with standard terminations/
electronic housing
A. Dimension (see Table 1-1)
B. Dimension (see Table 1-1)
C. Standard tube
D. Abrasion resistant tube
Note
All dimensions are in inches with millimeters in parentheses.
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Figure 1-3: Rosemount 6888A integral autocalibration housing
A. Dimension (see Table 1-1)
B. Hastelloy diffuser
C. Ceramic diffuser
D. Standard tube
E. Abrasion tube
F. Minimum removal length
Note
All dimensions are in inches with millimeters in parentheses.
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Figure 1-4: Rosemount 6888A integral autocalibration housing
close-up
A. Dimension (see Table 1-1)
B. Reference air vents
C. Calibration gas ¼-in tube fittings 5.0 scfh (2.4 L/min) 20 psig
(1.38 barg)
D. #10 socket head cap screw (external ground)
E. ½-in. NPT conduit connection (power, signal)
F. Reference gas ¼-in. tube fitting 2.0 scfh (1.0 L/min) 20 psig
(1.38 barg)
Note
All dimensions are in inches with millimeters in parentheses.
Table 1-1: Insertion and removal dimensions
Probe length(1) Dimension A
insertion depth
Dimension B
removal envelope
standard housing
Dimension B
removal envelope
accessory housing
18 in (457 mm) probe 16.1 in (409 mm) 15.77 in (400.6 mm) 19.26 in (489.2 mm)
3 ft (0.91 m) probe 33.52 in (851.4 mm) 46.6 in (1,184 mm) 50.1 in (1,273 mm)
6 ft (1.83 m) probe 68.52 in
(1,740.4 mm)
82.6 in (2,098 mm) 86.1 in (2,187 mm)
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Table 1-1: Insertion and removal dimensions (continued)
Probe length(1) Dimension A
insertion depth
Dimension B
removal envelope
standard housing
Dimension B
removal envelope
accessory housing
9 ft (2.74 m) probe 104.52 in
(2,654.8 mm)
118.6 in (3,012 mm) 122.1 in (3,101 mm)
12 ft (3.66 m) probe 140.52 in
(3,569.2 mm)
154.6 in (3,927 mm) 158.1 in (4,016 mm)
(1) Add 3.8 in (97 mm) to Dimension A and Dimension B for probe with ceramic or Hastelloy
diffuser.
The through hole diameter in the stack or duct wall and refractory
material must be at least 2.5 in (64 mm).
4. Insert probe through the opening in the mounting flange and bolt
the unit to the flange.
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Figure 1-5: Probe installation
A. Dimension (see Table 1-3)
B. Thread dimension (see Table 1-3)
C. Diameter (see Table 1-3)
D. Equally spaced
E. Four studs, lockwashers, and nuts equally spaced on C, diameter
B C
Note
All dimensions are in inches with millimeters in parentheses.
Table 1-2: Mounting flange
ANSI DIN
Flange diameter 7.28 in (184.9 mm)
Hole diameter 0.75 in (19.0 mm)
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Table 1-2: Mounting flange (continued)
ANSI DIN
(4) holes equally spaced
on BC
4.75 in (120.6 mm) 5.71 in (145.0 mm)
Table 1-3: Installation weld plate outline
Dimension ANSI DIN
A 152 in (3,861 mm) 191 in (4,851 mm)
B thread 11 in (279 mm) M16x2
C diameter 121 in (3,073 mm) 145 in (3,683 mm)
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Figure 1-6: Drip loop and insulation removal
A. Line voltage
B. Logic input/output, 4-20 mA signal
C. Drip loop
D. Stack or duct metal wall
E. Adapter plate
F. Insulation
G. Note
Replace insulation after installing analyzer.
Note
Standard housing probe shown. Accessory housing is similar. Probe
installation may be vertical or horizontal.
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1.2 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
Electrical shock
Failure to install covers and ground leads could result in serious injury or
death.
Disconnect and lock out power before connecting the power supply.
Install all protective covers and ground leads after installation.
To meet the safety requirements of IEC 61010-1 (EC requirement) and
ensure safe operation of the equipment, connect the main electrical
power supply through a circuit breaker (minimum 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 it does not, keep another external means of disconnecting the
power supply from the equipment located close by. Circuit breakers or
switches must comply with a recognized standard, such as IEC 947.
To maintain proper earth grounding, ensure that a positive connection
exists between the transmitter housing and earth. The connecting
ground wire must be 14 AWG minimum.
Line voltage, signal, and relay wiring should be rated for at least 221 °F
(105 °C)
1.2.1 Wire Rosemount 6888A Analyzer probe only (no Rosemount 6888Xi
Electronics)
The Rosemount 6888A Analyzer probe has electronics in the blue housing
that controls the heater temperature and also amplifies the raw O2 milli-volt
signal to a linear 4-20 mA. You can run the 4-20 mA signal lines directly to
the control room and also power the analyzer electronics. There is no O2
display or keypad on the probe, so you must set up the analyzer through
HART® communications using a hand-held communicator or Asset
Management Solutions (AMS) software.
Procedure
1. Remove the cover from the probe.
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2. Connect the line (L1 wire) to the L1 terminal, the neutral (L2 wire) to
the L2/N terminal, and the ground wire to the ground lug.
The analyzer accepts 120/240 Vac ±10 percent line voltage and
50/60 Hz. No setup is required.
Figure 1-7: Rosemount 6888A standard probe housing
A. AC input
B. Ground
C. Shield
D. 4-20 mA HART
E. AC input
F. Ground
G. Resistor
H. Power supply
I. Output to DCS
3. Connect the 4-20 mA signal wires at the analyzer. Use a shielded
twisted wire pair.
Do not allow bare shield wires to contact the circuit boards. Insulate
the shield wires prior to termination. The analyzer electronics are
loop-powered, meaning that the 4-20 mA signal wires supply 24 VDC
from the DCS or an external power supply.
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4. Terminate the shield only at the analyzer electronics housing unless
using a Rosemount 6888Xi. When using the Rosemount 6888 Xi
Advanced Electronics, terminate the shield at both ends.
NOTICE
The 4-20 mA signal represents the O2 value and also powers the
probe-mounted electronics. Superimposed on the 4-20 mA signal is
HART information accessible through a Field Communicator or AMS
software.
5. Reinstall cover on analyzer.
Postrequisites
Follow the instructions in the following sections only if a Rosemount 6888Xi
is included with your system configuration.
1.2.2 Wire standard housing analyzer probe plus Rosemount 6888Xi
Electronics
The Rosemount 6888Xi Electronics serve as an operator interface unit with a
back-lit display and keypad. It is capable of two channels, serving two
Rosemount 6888A probes.
Procedure
1. Remove cover screws from the front cover of the Rosemount 6888Xi.
Swing down the front cover of the interface box.
2. Pull out the input/output (IO) board on the right side of the card rack
inside the Rosemount 6888Xi.
If your system is configured to operate two analyzer probes, there
are two IO interface boards.
Figure 1-8: Power supply board
A. AC input
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Figure 1-9: IO boards
A. Rosemount 6888A standard probe housing
B. IO board - channel 1
C. IO board - channel 2
D. AC input
E. Ribbon cable to display board J2, Sensor 1
F. 4-20 mA output
G. Ferrite clamp
H. Ribbon cable to display board J3, Sensor 2
I. Shield ground
Table 1-4: Channel 1 jumper settings
Jumpers Settings
JP1 Pins 2-3
JP2 Pins 2-3
JP3 Pins 1-2, internal power
Pins 2-3, external power
JP7 Pins 1-2, internal power
Pins 2-3, external power
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Table 1-4: Channel 1 jumper settings (continued)
Jumpers Settings
JP8 Pins 1-2, internal power
Pins 2-3, external power
Table 1-5: Channel 1 SW4 switch settings
Position Setting
1 Off
2 Off
3 Off
4 Off
Table 1-6: Channel 2 jumper settings
Jumper Setting
JP1 Pins 1-2
JP2 Pins 1-2
JP5 Pins 1-2, internal power
Pins 2-3, external power
JP7 Pins 1-2, internal power
Pins 2-3, external power
JP8 Pins 1-2, internal power
Pins 2-3, external power
Table 1-7: Channel 2 SW4 switch settings
Position Setting
1 Off
2 Off
3 Off
4 Off
Note
a. Except for JP5, JP2, and JP8 on the IO board, jumper and
switch settings are factory set and are shown for reference
only.
b. IO board 4-20 mA/HART loop power settings:
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JP5: Pins 1-2 internal power Rosemount 6888Xi to Rosemount
6888A Analyzer, pins 2-3 external power Rosemount 6888Xi
to Rosemount 6888A Analyzer (requires 2500 resistor across
J4, PR+ to PR-)
JP7/JP8: Pins 1-2 internal power Rosemount 6888Xi to DCS,
pins 2-3 external power Rosemount 6888Xi to DCS.
Compare Table 1-8 to the model number on the probe tag to confirm
the features present in this specific probe.
Table 1-8: Remote type ordering information
Model code Description
1OXY Single channel O2
2OXY Single channel O2 with flame safety interlocking
heater
3OXY Dual channel O2
4OXY Single channel O2 traditional architecture for 120
V probes
Figure 1-10: Rosemount 6888Xi front view
A. Power supply board
B. Channel #2 IO board
C. Shield ground
D. Channel #1 IO board
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