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Xi Advanced Electronics
6-2
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
Combustion processes that have a high level of ash or other particulate
content will cause the diffusion element on the end of the probe to plug off. A
badly plugged diffuser will cause a slower speed of response to changing O
2
levels in the process. This can usually be seen on the recorded trends in the
control room.
When performing a calibration check or actual calibration, the calibration flow
meter may read lower if the diffuser is badly plugged. (Never increase the flow
rate back up, however, as this can cause a shifted calibration. Adjust the
calibration flow rate only when a new diffuser is installed). Always record the
response time back to the process after the calibration gases are removed, as
noted on the calibration record at the end of this section. Diffuser pluggage
can be tracked through this record.
A visual inspection of the probe should be conducted during plant outages,
paying particular attention to condensed components. Condensation can be
reduced or eliminated by insulating the probe installation, including the probe
mount, flange, and dual blue housings.
CALIBRATION The Xi can calibrate an O
2
Probe manually through the front panel display or
via a handheld 375/475 Field Communicator, or automatically through the
SPS 4001B Single Probe Autocalibration Sequencer or the IMPS 4000
Intelligent Multiprobe Test Gas Sequencer.
Automatic Calibration The Xi can be used with the SPS 4001B or IMPS 4000 in order to perform an
auto / semi-auto calibration.
Refer to the SPS 4001B or IMPS 4000 Instruction
Manual for further details on how to configure and perform an automatic
calibration.
Manual Calibration Refer to the "Calibration - General" in Section 4: Startup and Operation to
perform a manual calibration.
REPLACEMENT PARTS Refer to Section 7: Replacement Parts for individual replacement parts and
part replacement kits. Part replacement kits are available for each of the
components discussed in this section.