Xi Advanced Electronics
Instruction Manual
IM-106-910Xi, Original Issue November 2010
CALIBRATION
Automatic Calibration
Manual Calibration
REPLACEMENT PARTS
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 O2 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.
The Xi can calibrate an O2 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.
The Xi can be used with the SPS 4001B or IMPS 4000 in order to perform an auto /
Refer to the "Calibration - General" in Section 4: Startup and Operation to perform a manual calibration.
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.
