Rosemount Analytical 6888 Xi Specifications
Advanced Electronics for Zirconium Oxide Oxygen Probes
July 2017
Product Data Sheet
PDS 106-340.Xi
2
2
Xi Advanced Electronics for
Zirconium Oxide Oxygen Probes
Excellent accuracy
Large backlit display and keypad
NEMA 4X enclosure
Works with Westinghouse/Rosemount, and most
competitive ZrO probes
HART communications standard (AMS
aware)
Wireless - via THUM
TM
Adaptor
Advanced Features
Calibration recommended diagnostic
Automatic calibration capability
Extended process temperature ranges
Stoichiometer feature
Programmable reference
Loss-of-flame heater cut-out
Rosemount Analytical Xi
Advanced Electronics for
Zirconium Oxide Oxygen
Probes
The zirconium oxide sensing technology for measuring the
excess oxygen in combustion flue gases has gained prominence
over the past several decades. This versatile electronics is
specifically designed to run most O probes manufactured. The
large backlit LCD display makes it easy to set up and operate.
Fully automatic calibrations may be executed from this
electronics with the addition of a small solenoid box for
switching calibration gases.
Wireless THUM
TM
Adaptor
Xi enhanced interface
Advanced Electronics for Zirconium Oxide Oxygen Probes
July 2017
Product Data Sheet
PDS 106-340.Xi
O
2
2
2
The Xi electronics offers
the following unique
advanced features
never before offered for
probes:
Automatic Calibration
Plant personnel often ask how frequently an oxygen analyzer
requires calibration. The answer is very application-dependent
based upon the fuels being burned, normal levels of oxygen
and the sulfur content in the flue gases. The Xi addresses this
concern by providing an on-line diagnostic that determines
when a calibration should be conducted, eliminating many
unneeded calibrations and the technician and gas resources
they consume. The Xi electronics has an on-line impedance
measurement for the sensing cell.
This feature can trigger a fully automatic calibration by
sequencing solenoids to introduce calibration gases to the
sensing cell. The Single Probe Sequencer (SPS) switches CAL
gases to a single probe, while a Multi-Probe Sequencer (IMPS)
can handle 1 to 4 probes. Many needless calibrations based on
“time in service” are eliminated. A contact closure notifies the
control room when a calibration is taking place. The oxygen
output signal can be held at its last value, or released during
calibration. The Xi can also initiate calibrations by traditional
methods:
Contact closure from the user’s control room
Time since last calibration feature
– established by the autocalibration system
Xi enhanced interface
HART/AMS
Extended Process Temperature Range
Traditional O electronics will go into alarm if the process
temperature exceeds the controlled heater temperature. This
feature enables the Xi to turn off the internal heater in this
event, use the process temperature to heat the cell, and
calculate O on the fly from the changing process temperatures.
Note that accelerated probe and cell damage may occur as a
result of extended operation above 800°C (1462°F), but at least
the measurement will not go off-line during this event.
Stoichiometer
Process upsets can sometimes cause a combustion process to
go into substoichiometric or reducing conditions. The oxygen
readings from one or more probes may decline all the way to
zero. The stoichiometer cell will measure the amount of oxygen
deficiency during these reducing conditions. The trends in your
DCS can be set up for a lower range limit of -1 or -2% oxygen to
depict the level of oxygen deficiency. The operator can see if his
control actions to recover are having the desired effect. These
types of events do not occur frequently, but knowing the
parameters of the situation prevents overcorrecting while
coming out of the reducing condition.
Programmable Reference
– enhances operation for the following applications:
n
Moisture Monitoring – measuring the amount of moisture
coming off of industrial dryers by noting the dilution effect
water vapor has on the normal 20.95% ambient drying air.
n
Enriched Oxygen Combustion – Pure oxygen is sometimes
mixed in with the combustion air to increase heat at the
flame. This is used in steel and other metals reduction
processes and also in some catalyst regenerators.
n
Flame Safety Interlock – dry contact from a flame safety
system removes power from the probe heater in a
loss-of-flame event.
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www.Emerson.com/RosemountGasAnalysis
Advanced Electronics for Zirconium Oxide Oxygen Probes
July 2017
Product Data Sheet
PDS 106-340.Xi
Specifications
General Purpose Certifications
Xi Ambient Temp.Limits
-20° to 55°C (-4° to 131°F)
Xi Temp. Limits as measured inside the housing
-20° to 55°C (-4° to 113°F)
Xi LCD display Temp. Limits
-20° to 55°C (-4° to 131°F)
Installation Specifications
Electrical Power of Oxymitter or
optional Xi electronics
120 to 240V, ±10% 50/60 Hz
Power Consumption of Xi
10 watts maximum
Xi Alarms Relays
2 provided - 2 amps, 30 VDC
Xi Optional Loss of Flame Contact
Removes heater power
Electrical Noise
Meets EN 61326, Class A
Power
100-240V ±10%, 50-60Hz
Power Consumption of Xi
12VA maximum or 776VA maximum with Traditional Architecture, 120V, Probes. 450VA maximum with Traditional
Architecture, 44V Probes
Alarm Relay Outputs
Two provided - 2 Amperes, 30 VDO, Form-C
Optional Loss of Flame Input
internally power input to remove heater power, actuated via
dry contact output from proof-of-flame device
Emerson Process Management has satisfied all
obligations coming from the European legislation
to harmonize the product requirements in Europe.
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All static performance characteristics are with
operating variables constant. Specifications subject
to change without notice.
www.Emerson.com/RosemountGasAnalysis
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